DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) |
12 Months Ended | ||||||||||||||||||||||||
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Dec. 31, 2015
USD ($)
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Mar. 31, 2015
USD ($)
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Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 3,448,200,000 | $ 3,980,000,000 | Ìý | Ìý | |||||||||||||||||||||
Gain on extinguishment of debt | 392,900,000 | 16,200,000 | $ 0 | Ìý | |||||||||||||||||||||
Long-term Debt | 2,699,400,000 | 2,826,500,000 | Ìý | Ìý | |||||||||||||||||||||
LONG-TERM DEBT | 2,699,400,000 | 2,826,500,000 | Ìý | Ìý | |||||||||||||||||||||
Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Repurchased Face Amount | $ 10,700,000 | $ 10,000,000 | Ìý | $ 58,300,000 | |||||||||||||||||||||
Stated interest rate | 4.875% | 4.875% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 412,500,000 | $ 690,000,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 200,000 | $ 500,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Repurchase Discount | 50.00% | 40.50% | Ìý | 52.00% | |||||||||||||||||||||
Gain on extinguishment of debt | Ìý | $ 4,100,000 | Ìý | Ìý | |||||||||||||||||||||
Type | Fixed | Fixed | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2021 | 2021 | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [1] | $ 410,600,000 | $ 686,000,000 | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 4.89% | 4.89% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 700,000,000 | $ 700,000,000 | Ìý | Ìý | |||||||||||||||||||||
$500 million 4.80% 2020 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Repurchased Face Amount | $ 1,800,000 | $ 10,000,000 | Ìý | $ 43,800,000 | |||||||||||||||||||||
Stated interest rate | 4.80% | 4.80% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 306,700,000 | $ 490,000,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 400,000 | $ 600,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Repurchase Discount | 50.00% | 40.25% | Ìý | 54.30% | |||||||||||||||||||||
Gain on extinguishment of debt | Ìý | $ 4,000,000 | Ìý | Ìý | |||||||||||||||||||||
Type | Fixed | Fixed | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2020 | 2020 | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [2] | $ 305,200,000 | $ 487,200,000 | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 4.83% | 4.83% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 500,000,000.0 | $ 500,000,000 | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis | treasury rate | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis | 0.35% | Ìý | Ìý | Ìý | |||||||||||||||||||||
$800 Million 6.25% 2040 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Repurchased Face Amount | Ìý | Ìý | Ìý | $ 45,900,000 | |||||||||||||||||||||
Stated interest rate | 6.25% | 6.25% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 492,800,000 | $ 800,000,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 5,800,000 | $ 9,500,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Repurchase Discount | Ìý | Ìý | Ìý | 52.50% | |||||||||||||||||||||
Type | Fixed | Fixed | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2040 | 2040 | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [3] | $ 482,700,000 | $ 783,300,000 | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 6.34% | 6.34% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 800,000,000 | Ìý | Ìý | Ìý | |||||||||||||||||||||
$400 Million 5.90% 2020 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Repurchased Face Amount | $ 36,000,000 | $ 5,000,000 | Ìý | $ 1,300,000 | |||||||||||||||||||||
Stated interest rate | 5.90% | 5.90% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 290,800,000 | $ 395,000,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 800,000 | $ 1,300,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Repurchase Discount | 50.00% | 38.125% | Ìý | 58.00% | |||||||||||||||||||||
Gain on extinguishment of debt | $ 1,900,000.0 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Type | Fixed | Fixed | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2020 | 2020 | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [4] | $ 288,900,000 | $ 391,900,000 | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 5.98% | 5.98% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 400,000,000 | $ 400,000,000 | Ìý | Ìý | |||||||||||||||||||||
$500 Million 3.95% 2018 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Repurchased Face Amount | $ 20,000,000 | Ìý | Ìý | $ 44,000,000 | |||||||||||||||||||||
Stated interest rate | 3.95% | 3.95% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 311,200,000 | $ 480,000,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 1,200,000 | $ 2,600,000 | Ìý | Ìý | |||||||||||||||||||||
Debt Repurchase Discount | Ìý | 30.875% | Ìý | 77.50% | |||||||||||||||||||||
Gain on extinguishment of debt | Ìý | $ 6,200,000 | Ìý | Ìý | |||||||||||||||||||||
Type | Fixed | Fixed | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2018 | 2018 | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [5] | $ 309,100,000 | $ 475,300,000 | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 6.30% | 5.17% | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 500,000,000 | $ 500,000,000.0 | Ìý | Ìý | |||||||||||||||||||||
Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 8.25% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 540,000,000 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 32,100,000.0 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Type | Fixed | Ìý | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2020 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [6] | $ 497,400,000 | Ìý | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 9.97% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 540,000,000 | 0 | Ìý | Ìý | |||||||||||||||||||||
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 7.75% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 544,200,000 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 131,500,000 | Ìý | Ìý | $ 147,000,000 | |||||||||||||||||||||
Type | Fixed | Ìý | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2020 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt | [7] | $ 403,200,000 | Ìý | Ìý | Ìý | ||||||||||||||||||||
Imputed interest rate | 15.55% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 544,200,000 | 0 | Ìý | Ìý | |||||||||||||||||||||
Revolving Credit Facility [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 550,000,000 | $ 1,125,000,000 | Ìý | Ìý | |||||||||||||||||||||
Type | Variable | Variable | Ìý | Ìý | |||||||||||||||||||||
Final Maturity | 2020 | 2017 | Ìý | Ìý | |||||||||||||||||||||
Credit facility, amount outstanding | $ 0 | [8] | $ 0 | [9] | Ìý | Ìý | |||||||||||||||||||
Imputed interest rate | Ìý | 2.94% | Ìý | Ìý | |||||||||||||||||||||
Credit facility remaining capacity | 179,200,000 | $ 975,500,000 | Ìý | Ìý | |||||||||||||||||||||
Letter of Credit [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Credit facility, amount outstanding | 186,300,000 | 149,500,000 | Ìý | Ìý | |||||||||||||||||||||
Interest Rate Swap [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Fair Value Adjustment to Interest Rate Hedge | $ 2,300,000 | $ 2,800,000 | Ìý | Ìý | |||||||||||||||||||||
Senior Notes Five Hundred Million [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis | treasury rate | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis | 0.50% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Senior Notes10 Year Tranche [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis | treasury rate | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis | 0.25% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Senior Notes30 Year Tranche [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 300,000,000 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis | treasury rate | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis | 0.40% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Five Hundred Million Six Point Two Five Percent Two Thousand And Forty [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount | $ 500,000,000 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Variable Rate Basis | treasury rate | Ìý | Ìý | Ìý | |||||||||||||||||||||
Discount Rate Used to Calculate Present Values of Remaining Scheduled Payments of Principal and Interest on Notes to Be Redeemed, Spread on Rate Basis | 0.40% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Minimum [Member] | Revolving Credit Facility [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Base Rate | 0.005 | Ìý | Ìý | Ìý | |||||||||||||||||||||
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