Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details)

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DEBT AND CREDIT FACILITIES (Schedule Of Long-Term Debt) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total Face Amount $ 3,144,300,000 $ 3,448,200,000
Letters of credit outstanding 110,300,000 186,300,000
Long-term Debt 2,499,100,000 2,699,400,000
Debt, Long-term and Short-term, Combined Amount 2,516,600,000  
Long-term Debt, Current Maturities 17,500,000  
$700 Million 4.875% 2021 Senior Note [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Original Face Value $ 700,000,000 700,000,000
Stated interest rate 4.875%  
Debt Instrument, Face Amount Exchanged $ 76,300,000  
Total Face Amount 336,200,000 412,500,000
Unamortized Debt Issuance Expense (1,300,000) (1,700,000)
Long-term Debt 334,700,000 410,600,000
Debt Instrument, Unamortized Discount $ (200,000) $ (200,000)
Imputed interest rate 4.89% 4.89%
Senior Notes One Point Three Billion [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Original Face Value $ 1,300,000,000.0 $ 1,300,000,000.0
$500 million 4.80% 2020 Senior Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.80%  
Debt Instrument, Face Amount Exchanged $ 44,700,000  
Total Face Amount 261,900,000 306,700,000
Unamortized Debt Issuance Expense (900,000) (1,100,000)
Long-term Debt 260,700,000 305,200,000
Debt Instrument, Unamortized Discount $ (300,000) $ (400,000)
Imputed interest rate 4.83% 4.83%
$800 Million 6.25% 2040 Senior Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 6.25%  
Debt Instrument, Face Amount Exchanged $ 194,400,000  
Total Face Amount 298,400,000 $ 492,800,000
Unamortized Debt Issuance Expense (2,600,000) (4,300,000)
Long-term Debt 292,300,000 482,700,000
Debt Instrument, Unamortized Discount $ (3,500,000) $ (5,800,000)
Imputed interest rate 6.34% 6.34%
$400 Million 5.90% 2020 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Original Face Value $ 400,000,000 $ 400,000,000
Stated interest rate 5.90%  
Debt Instrument, Face Amount Exchanged $ 65,100,000  
Total Face Amount 225,600,000 290,800,000
Unamortized Debt Issuance Expense (700,000) (1,100,000)
Long-term Debt 224,300,000 288,900,000
Debt Instrument, Unamortized Discount $ (600,000) $ (800,000)
Imputed interest rate 5.98% 5.98%
$500 Million 3.95% 2018 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Original Face Value $ 500,000,000.0 $ 500,000,000.0
Stated interest rate 3.95%  
Debt Instrument, Face Amount Exchanged $ 17,600,000  
Total Face Amount 283,600,000 311,200,000
Unamortized Debt Issuance Expense (800,000) (900,000)
Long-term Debt 281,900,000 309,100,000
Debt Instrument, Unamortized Discount $ (900,000) $ (1,200,000)
Imputed interest rate 6.12% 6.30%
Five hundred forty million Eight point two five Twenty twenty First Lien Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Original Face Value $ 540,000,000  
Stated interest rate 8.25%  
Total Face Amount $ 540,000,000 $ 540,000,000
Unamortized Debt Issuance Expense (9,800,000) (10,500,000)
Long-term Debt 499,700,000 497,400,000
Debt Instrument, Unamortized Discount $ (30,500,000) $ (32,100,000)
Imputed interest rate 9.97% 9.97%
Two hundred Eighteen Point Five Million Eight Point Zero Twenty Twenty One Point Five Lien Notes [Member]    
Debt Instrument [Line Items]    
Stated interest rate 8.00%  
Debt Instrument, Face Amount Received in Debt Exchange of $544M 7.75% Notes $ 57,000,000  
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes 11,400,000  
Debt Instrument, Carrying Amount Received in Debt Exchange of $400M 5.90% Notes 35,400,000  
Debt Instrument, Carrying Value Received in Debt Exchange of $800M 6.25% Notes 103,000,000  
Debt Instrument, Carrying Value Received in Debt Exchange of $500M 4.80% Notes 24,400,000  
Debt instrument, Carrying Value Received in Debt Exchange of $700M 4.875% Notes 41,500,000  
Debt Instrument, Face Amount Received in Debt Exchange of $400M 5.90% Notes 26,000,000  
Debt Instrument, Face Amount Received in Debt Exchange of $800M 6.25% Notes 75,800,000  
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes 17,900,000  
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes 30,500,000  
Total Face Amount 218,500,000  
Debt Instrument, Par Value 218,500,000  
Unamortized Debt Issuance Expense 0  
Undiscounted interest 78,800,000  
Long-term Debt 297,300,000  
Five hundred Forty-four Million Seven Point Seven Five Twenty Twenty Second Lien Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Original Face Value $ 544,200,000.0  
Stated interest rate 7.75%  
Debt Instrument, Face Amount Exchanged $ 114,100,000  
Total Face Amount 430,100,000 $ 544,200,000
Unamortized Debt Issuance Expense (7,100,000) (9,500,000)
Long-term Debt 323,500,000 403,200,000
Debt Instrument, Unamortized Discount $ (99,500,000) $ (131,500,000)
Imputed interest rate 15.55% 15.55%
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Par Value $ 550,000,000 $ 550,000,000
Credit facility, amount outstanding 0 [1] 0
Line of Credit Facility, Maximum Borrowing Capacity 368,900,000 366,000,000
Letters of credit outstanding 110,300,000  
Credit facility remaining capacity 258,600,000 179,200,000
Letter of Credit [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding   186,300,000
Hedge Obligations [Member]    
Debt Instrument [Line Items]    
Credit facility, amount outstanding   500,000
Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Fair Value Adjustment to Interest Rate Hedge 2,200,000 $ 2,300,000
Exchange of Debt [Member] | $500 Million 3.95% 2018 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Carrying Amount Received in Debt Exchange of $544.2M 7.75% Notes 77,500,000  
Debt Instrument, Carrying Amount Received in Debt Exchange of $500M 3.95% Notes $ 15,500,000  
[1] As of March 31, 2016, no loans were drawn under the ABL Facility and we had total availability of $368.9 million as a result of borrowing base limitations. As of March 31, 2016, the principal amount of letter of credit obligations totaled $110.3 million, thereby further reducing available borrowing capacity on our ABL Facility to $258.6 million.