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Annual report pursuant to Section 13 and 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 ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Long-term debt: Ìý Ìý
Fair Value Adjustment to Interest Rate Hedge Ìý $ 0.2
Reported Value Measurement [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value $ 2,113.8 2,092.9
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 0.0 0.2
Estimate of Fair Value Measurement [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 2,237.0 2,039.9
Estimate of Fair 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 0.0 0.2
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 4.875% 2024 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 393.6 392.1
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 0.0 123.8
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $316.25 Million 1.50% 2025 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 246.7 235.2
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $1.075 Billion 5.75% 2025 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 464.2 1,048.8
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $750 Million 5.875% 2027 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 716.4 0.0
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $800 Million 6.25% 2040 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 292.9 292.8
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 4.875% 2024 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 410.0 370.2
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 0.0 122.3
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $316.25 Million 1.50% 2025 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 385.0 352.4
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $1.075 Billion 5.75% 2025 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 473.3 962.0
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $750 Million 5.875% 2027 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 718.5 0.0
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $800 Million 6.25% 2040 Senior Notes [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 250.2 232.8
Line of Credit [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ABL Facility [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value 0.0 0.0
Line of Credit [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ABL Facility [Member] Ìý Ìý
Long-term debt: Ìý Ìý
Long-term Debt, Fair Value $ 0.0 $ 0.0