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 ($)
Sep. 30, 2018
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
LONG-TERM DEBT $ 2,300,000,000   $ 2,304,200,000 $ 2,304,200,000
$400 Million 4.875% 2024 Senior Notes [Domain]        
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 (6,000,000)     (7,100,000)
Debt Instrument, Unamortized Discount (2,300,000)     (2,600,000)
Long-term Debt $ 391,700,000     $ 390,300,000
$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 $ 88,400,000     $ 88,900,000
Unamortized Debt Issuance Expense (100,000)     (200,000)
Debt Instrument, Unamortized Discount (100,000)     (100,000)
Long-term Debt $ 88,200,000     $ 88,600,000
$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 $ 122,300,000     $ 122,400,000
Unamortized Debt Issuance Expense (200,000)     (300,000)
Debt Instrument, Unamortized Discount (100,000)     (100,000)
Long-term Debt $ 122,000,000     $ 122,000,000
$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 $ 124,200,000     $ 138,400,000
Unamortized Debt Issuance Expense (300,000)     (300,000)
Debt Instrument, Unamortized Discount 0     (100,000)
Long-term Debt $ 123,900,000     $ 138,000,000
$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 (5,800,000)     (6,600,000)
Debt Instrument, Unamortized Discount (78,100,000)     (85,600,000)
Long-term Debt $ 232,400,000     $ 224,100,000
$1,075 Million 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     $ 1,075,000,000
Unamortized Debt Issuance Expense (10,300,000)     (11,300,000)
Debt Instrument, Unamortized Discount (15,100,000)     (16,500,000)
Long-term Debt $ 1,047,900,000     $ 1,047,200,000
$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 (2,300,000)     (2,400,000)
Debt Instrument, Unamortized Discount (3,300,000)     (3,400,000)
Long-term Debt 292,800,000     292,600,000
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Par Value 450,000,000 $ 450,000,000   550,000,000
Credit facility, amount outstanding 0     0
Interest Rate Swap [Member]        
Debt Instrument [Line Items]        
Fair Value Adjustment to Interest Rate Hedge $ 1,100,000     $ 1,400,000