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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount $ 4,528,000,000 $ 4,814,800,000
Long-term debt: Ìý Ìý
Long-term Debt 3,247,200,000 3,043,500,000
Total long-term debt, carrying value 3,012,500,000 3,022,600,000
$700 Million 4.875% 2021 Senior Note [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount 700,000,000 700,000,000
Long-term debt: Ìý Ìý
Long-term Debt 699,500,000 [1] 699,400,000 [1]
Senior Notes - $1.3 Billion [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount 1,300,000,000.0 1,300,000,000.0
Senior Notes - $400 Million [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount 400,000,000 400,000,000
Long-term debt: Ìý Ìý
Long-term Debt 398,600,000 [2] 398,400,000 [2]
Senior Notes - $500 Million [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount 500,000,000.0 500,000,000.0
Long-term debt: Ìý Ìý
Long-term Debt 497,100,000 [3] 496,500,000 [3]
Revolving Credit Facility [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount 1,250,000,000 1,750,000,000
Long-term debt: Ìý Ìý
Revolving loan, carrying value 0 [4] 0 [4]
Equipment Loans [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Debt Instrument, Face Amount 164,800,000 164,800,000
Long-term debt: Ìý Ìý
Long-term Debt 146,100,000 161,700,000
Interest Rate Swap [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Fair Value Adjustment to Interest Rate Hedge 2,900,000 (2,100,000)
Fair Value, Inputs, Level 2 [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Total long-term debt, fair value 2,416,600,000 3,217,700,000
Fair Value, Inputs, Level 2 [Member] | $700 Million 4.875% 2021 Senior Note [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Debt Instrument, Fair Value Disclosure 539,600,000 718,200,000
Fair Value, Inputs, Level 2 [Member] | Senior Notes - $1.3 Billion [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Debt Instrument, Fair Value Disclosure 974,700,000 1,404,900,000
Fair Value, Inputs, Level 2 [Member] | Senior Notes - $400 Million [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Debt Instrument, Fair Value Disclosure 341,800,000 432,100,000
Fair Value, Inputs, Level 2 [Member] | Senior Notes - $500 Million [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Debt Instrument, Fair Value Disclosure 433,000,000 523,800,000
Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Revolving loan, fair value 0 0
Fair Value, Inputs, Level 2 [Member] | Equipment Loans [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Debt Instrument, Fair Value Disclosure 124,600,000 140,800,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Fair Value Adjustment to Interest Rate Hedge 2,900,000 (2,100,000)
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Total long-term debt, carrying value 3,012,500,000 3,022,600,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | $700 Million 4.875% 2021 Senior Note [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Senior Notes, Noncurrent 699,500,000 699,400,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $1.3 Billion [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Senior Notes, Noncurrent 1,289,800,000 1,289,600,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $400 Million [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Senior Notes, Noncurrent 398,600,000 398,400,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $500 Million [Member]
 Ìý Ìý
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Ìý Ìý
Senior Notes, Noncurrent 497,100,000 496,500,000.0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Revolving loan, carrying value 0 0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Equipment Loans [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt 124,600,000 140,800,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
 Ìý Ìý
Long-term debt: Ìý Ìý
Fair Value Adjustment to Interest Rate Hedge $ 2,900,000 $ (2,100,000)
[1] As of SeptemberÌý30, 2014 and DecemberÌý31, 2013, the $700 million 4.875 percent senior notes were recorded at a par value of $700 million less unamortized discounts of $0.5 million and $0.6 million, respectively, based on an imputed interest rate of 4.89 percent.
[2] As of SeptemberÌý30, 2014 and DecemberÌý31, 2013, the $400 million 5.90 percent senior notes were recorded at a par value of $400 million less unamortized discounts of $1.4 million and $1.6 million, respectively, based on an imputed interest rate of 5.98 percent.
[3] As of SeptemberÌý30, 2014 and DecemberÌý31, 2013, the $500 million 3.95 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $2.9 million and $3.5 million, respectively, based on an imputed interest rate of 4.14 percent.
[4] As of SeptemberÌý30, 2014 and DecemberÌý31, 2013, no revolving loans were drawn under the revolving credit agreement. As of SeptemberÌý30, 2014 and DecemberÌý31, 2013, the principal amount of letter of credit obligations totaled $5.2 million and $8.4 million, respectively, thereby reducing available borrowing capacity to $1.2 billion and $1.7 billion for each period, respectively.