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, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
LONG-TERM DEBT $ 2,087,000,000 $ 2,092,900,000
$400 Million 4.875% 2024 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 5.00% 5.00%
Debt Instrument, Par Value $ 400,000,000 $ 400,000,000
Unamortized Debt Issuance Expense (5,500,000) (5,700,000)
Debt Instrument, Unamortized Discount (2,100,000) (2,200,000)
Long-term Debt $ 392,400,000 $ 392,100,000
$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 $ 114,000,000 $ 124,000,000
Unamortized Debt Issuance Expense (200,000) (200,000)
Debt Instrument, Unamortized Discount 0 0
Long-term Debt $ 113,800,000 $ 123,800,000
$316 Million 1.5% 2025 Senior Notes [Domain]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 6.26% 6.26%
Debt Instrument, Par Value $ 316,300,000 $ 316,300,000
Unamortized Debt Issuance Expense (5,300,000) (5,500,000)
Debt Instrument, Unamortized Discount (73,000,000) (75,600,000)
Long-term Debt $ 238,000,000 $ 235,200,000
$1.075 Billion 5.75% 2025 Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 6.01% 6.01%
Debt Instrument, Par Value $ 1,073,300,000 $ 1,073,300,000
Unamortized Debt Issuance Expense (9,500,000) (9,900,000)
Debt Instrument, Unamortized Discount (14,100,000) (14,600,000)
Long-term Debt $ 1,049,700,000 $ 1,048,800,000
$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 (2,200,000) (2,300,000)
Debt Instrument, Unamortized Discount (3,300,000) (3,300,000)
Long-term Debt 292,900,000 292,800,000
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Par Value 450,000,000 450,000,000
Credit facility, amount outstanding 0 0
Interest Rate Swap [Member]    
Debt Instrument [Line Items]    
Fair Value Adjustment to Interest Rate Hedge $ 200,000 $ 200,000