DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions |
9 Months Ended | ||||||||||||||||||||||||
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Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
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Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes | Ìý | Ìý | $ 10.0 | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes | $ 4.5 | $ 12.6 | Ìý | Ìý | |||||||||||||||||||||
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes | 10.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 2,833.1 | Ìý | Ìý | $ 3,448.2 | |||||||||||||||||||||
Letters of credit outstanding | 108.8 | Ìý | Ìý | 186.3 | |||||||||||||||||||||
Long-term Debt | 2,195.9 | Ìý | Ìý | 2,699.4 | |||||||||||||||||||||
Debt, Long-term and Short-term, Combined Amount | 2,213.4 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Long-term Debt, Current Maturities | $ 17.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
$700 Million 4.875% 2021 Senior Note [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 4.875% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Exchanged | $ 76.3 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 325.7 | [1] | Ìý | Ìý | 412.5 | ||||||||||||||||||||
Unamortized Debt Issuance Expense | (1.2) | [1] | Ìý | Ìý | (1.7) | ||||||||||||||||||||
Long-term Debt | 324.3 | [1] | Ìý | Ìý | 410.6 | ||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ (0.2) | [1] | Ìý | Ìý | $ (0.2) | ||||||||||||||||||||
Imputed interest rate | 4.89% | [1] | Ìý | Ìý | 4.89% | ||||||||||||||||||||
$500 million 4.80% 2020 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 4.80% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Exchanged | $ 44.7 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 244.8 | [2] | Ìý | Ìý | $ 306.7 | ||||||||||||||||||||
Unamortized Debt Issuance Expense | (0.7) | [2] | Ìý | Ìý | (1.1) | ||||||||||||||||||||
Long-term Debt | 243.9 | [2] | Ìý | Ìý | 305.2 | ||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ (0.2) | [2] | Ìý | Ìý | $ (0.4) | ||||||||||||||||||||
Imputed interest rate | 4.83% | [2] | Ìý | Ìý | 4.83% | ||||||||||||||||||||
$800 Million 6.25% 2040 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 6.25% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Exchanged | $ 194.4 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 298.4 | [3] | Ìý | Ìý | $ 492.8 | ||||||||||||||||||||
Unamortized Debt Issuance Expense | (2.5) | [3] | Ìý | Ìý | (4.3) | ||||||||||||||||||||
Long-term Debt | 292.5 | [3] | Ìý | Ìý | 482.7 | ||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ (3.4) | [3] | Ìý | Ìý | $ (5.8) | ||||||||||||||||||||
Imputed interest rate | 6.34% | [3] | Ìý | Ìý | 6.34% | ||||||||||||||||||||
$400 Million 5.90% 2020 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 5.90% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Exchanged | $ 65.1 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 225.6 | [4] | Ìý | Ìý | $ 290.8 | ||||||||||||||||||||
Unamortized Debt Issuance Expense | (0.7) | [4] | Ìý | Ìý | (1.1) | ||||||||||||||||||||
Long-term Debt | 224.4 | [4] | Ìý | Ìý | 288.9 | ||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ (0.5) | [4] | Ìý | Ìý | $ (0.8) | ||||||||||||||||||||
Imputed interest rate | 5.98% | [4] | Ìý | Ìý | 5.98% | ||||||||||||||||||||
$500 Million 3.95% 2018 Senior Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 3.95% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Exchanged | $ 17.6 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 0.0 | [5] | Ìý | Ìý | $ 311.2 | ||||||||||||||||||||
Unamortized Debt Issuance Expense | 0.0 | [5] | Ìý | Ìý | (0.9) | ||||||||||||||||||||
Long-term Debt | 0.0 | [5] | Ìý | Ìý | 309.1 | ||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ 0.0 | [5] | Ìý | Ìý | $ (1.2) | ||||||||||||||||||||
Imputed interest rate | 6.15% | [5] | Ìý | Ìý | 6.30% | ||||||||||||||||||||
$540 Million 8.25% 2020 Lien Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 8.25% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | $ 540.0 | Ìý | Ìý | $ 540.0 | |||||||||||||||||||||
Unamortized Debt Issuance Expense | (8.6) | Ìý | Ìý | (10.5) | |||||||||||||||||||||
Long-term Debt | 504.0 | Ìý | Ìý | 497.4 | |||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ (27.4) | Ìý | Ìý | $ (32.1) | |||||||||||||||||||||
Imputed interest rate | 9.97% | Ìý | Ìý | 9.97% | |||||||||||||||||||||
$218.5 Million 8.00% 2020 Lien Notes [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Stated interest rate | 8.00% | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Carrying Amount Received in Debt Exchange of $544.2M 7.75% Notes | $ 77.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $544M 7.75% Notes | 57.0 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes | 11.4 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Carrying Amount Received in Debt Exchange of $500M 3.95% Notes | 15.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Carrying Amount Received in Debt Exchange of $400M 5.90% Notes | 35.4 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Carrying Value Received in Debt Exchange of $800M 6.25% Notes | 103.0 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Carrying Value Received in Debt Exchange of $500M 4.80% Notes | 24.4 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt instrument, Carrying Value Received in Debt Exchange of $700M 4.875% Notes | 41.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $400M 5.90% Notes | 26.0 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $800M 6.25% Notes | 75.8 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes | 17.9 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes | 30.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | [6] | 218.5 | Ìý | Ìý | Ìý | ||||||||||||||||||||
Debt Instrument, Par Value | 218.5 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Unamortized Debt Issuance Expense | [6] | 0.0 | Ìý | Ìý | Ìý | ||||||||||||||||||||
Undiscounted interest | [6] | 70.0 | Ìý | Ìý | Ìý | ||||||||||||||||||||
Long-term Debt | [6] | $ 288.5 | Ìý | Ìý | Ìý | ||||||||||||||||||||
$544 Million 7.75% 2020 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, Face Amount Exchanged | $ 114.1 | Ìý | Ìý | Ìý | |||||||||||||||||||||
Total Face Amount | 430.1 | [7] | Ìý | Ìý | $ 544.2 | ||||||||||||||||||||
Unamortized Debt Issuance Expense | (6.2) | [7] | Ìý | Ìý | (9.5) | ||||||||||||||||||||
Long-term Debt | 333.8 | [7] | Ìý | Ìý | 403.2 | ||||||||||||||||||||
Debt Instrument, Unamortized Discount | $ (90.1) | [7] | Ìý | Ìý | $ (131.5) | ||||||||||||||||||||
Imputed interest rate | 15.55% | [7] | Ìý | Ìý | 15.55% | ||||||||||||||||||||
Revolving Credit Facility [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument, Par Value | $ 550.0 | [8] | Ìý | Ìý | $ 550.0 | [9] | |||||||||||||||||||
Credit facility, amount outstanding | [8] | 0.0 | Ìý | Ìý | Ìý | ||||||||||||||||||||
Line of Credit Facility, Maximum Borrowing Capacity | 355.7 | Ìý | Ìý | 366.0 | |||||||||||||||||||||
Letters of credit outstanding | 108.8 | Ìý | Ìý | 186.3 | |||||||||||||||||||||
Credit facility remaining capacity | 246.9 | Ìý | Ìý | 179.2 | |||||||||||||||||||||
Hedge Obligations [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Credit facility, amount outstanding | Ìý | Ìý | Ìý | 0.5 | |||||||||||||||||||||
Interest Rate Swap [Member] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Debt Instrument [Line Items] | Ìý | Ìý | Ìý | Ìý | |||||||||||||||||||||
Fair Value Adjustment to Interest Rate Hedge | $ 2.0 | Ìý | Ìý | $ 2.3 | |||||||||||||||||||||
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