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 ($)
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt   $ 2,192,600,000
Long-term Debt, Current Maturities   17,500,000
Long-term Debt, Excluding Current Maturities $ 1,642,900,000 $ 2,175,100,000
$540 Million 8.25% 2020 Lien Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 9.97% 9.97%
Debt Instrument, Par Value $ 540,000,000 $ 540,000,000
Unamortized Debt Issuance Expense (7,400,000) (8,000,000)
Debt Instrument, Unamortized Discount (24,000,000) (25,700,000)
Long-term Debt $ 508,600,000 506,300,000
$218.5 Million 8.00% 2020 Lien Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Par Value   218,500,000
Unamortized Debt Issuance Expense   0
Debt Instrument, Unamortized Discount   65,700,000
Long-term Debt   $ 284,200,000
$544 Million 7.75% 2020 Lien Notes[Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage   15.55%
Debt Instrument, Par Value   $ 430,100,000
Unamortized Debt Issuance Expense   (5,800,000)
Debt Instrument, Unamortized Discount   (85,200,000)
Long-term Debt   $ 339,100,000
$400 Million 5.90% 2020 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 5.98% 5.98%
Debt Instrument, Par Value $ 88,900,000 $ 225,600,000
Unamortized Debt Issuance Expense (200,000) (600,000)
Debt Instrument, Unamortized Discount (200,000) (500,000)
Long-term Debt $ 88,500,000 $ 224,500,000
$500 million 4.80% 2020 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.83% 4.83%
Debt Instrument, Par Value $ 122,400,000 $ 236,800,000
Unamortized Debt Issuance Expense (300,000) (700,000)
Debt Instrument, Unamortized Discount (100,000) (200,000)
Long-term Debt $ 122,000,000 $ 235,900,000
$700 Million 4.875% 2021 Senior Note [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.89% 4.89%
Debt Instrument, Par Value $ 138,400,000 $ 309,400,000
Unamortized Debt Issuance Expense (400,000) (1,000,000)
Debt Instrument, Unamortized Discount (100,000) (200,000)
Long-term Debt $ 137,900,000 $ 308,200,000
$500 Million 5.75% 2025 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 5.75%  
Debt Instrument, Par Value $ 500,000,000  
Unamortized Debt Issuance Expense (8,300,000)  
Debt Instrument, Unamortized Discount 0  
Long-term Debt $ 491,700,000  
$800 Million 6.25% 2040 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 6.34% 6.34%
Debt Instrument, Par Value $ 298,400,000 $ 298,400,000
Unamortized Debt Issuance Expense (2,500,000) (2,500,000)
Debt Instrument, Unamortized Discount (3,400,000) (3,400,000)
Long-term Debt 292,500,000 292,500,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Par Value 550,000,000 550,000,000
Credit facility, amount outstanding 0 0
Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Fair Value Adjustment to Interest Rate Hedge $ 1,700,000 $ 1,900,000