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, 2018
Dec. 31, 2017
Interest Rate Swap [Member]    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge $ 0.2 $ 1.4
Reported Value Measurement [Member]    
Long-term debt:    
Long-term Debt, Fair Value 2,092.9 2,304.2
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge 0.2 1.4
Estimate of Fair Value Measurement [Member]    
Long-term debt:    
Long-term Debt, Fair Value 2,039.9 2,346.3
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge 0.2 1.4
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 4.875% 2024 Senior Notes [Member]    
Long-term debt:    
Long-term Debt, Fair Value 392.1 390.3
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes    
Long-term debt:    
Long-term Debt, Fair Value 0.0 88.6
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $500 Million 4.80% 2020 Senior Notes    
Long-term debt:    
Long-term Debt, Fair Value 0.0 122.0
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Notes    
Long-term debt:    
Long-term Debt, Fair Value 123.8 138.0
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $316 Million 1.5% 2025 Senior Notes [Domain]    
Long-term debt:    
Long-term Debt, Fair Value 235.2 224.1
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $1.075 Billion 5.75% 2025 Senior Notes [Member]    
Long-term debt:    
Long-term Debt, Fair Value 1,048.8 1,047.2
Senior Notes [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $800 Million 6.25% 2040 Senior Notes [Member]    
Long-term debt:    
Long-term Debt, Fair Value 292.8 292.6
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 4.875% 2024 Senior Notes [Member]    
Long-term debt:    
Long-term Debt, Fair Value 370.2 398.0
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $400 Million 5.90% 2020 Senior Notes    
Long-term debt:    
Long-term Debt, Fair Value 0.0 88.0
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $500 Million 4.80% 2020 Senior Notes    
Long-term debt:    
Long-term Debt, Fair Value 0.0 118.8
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $700 Million 4.875% 2021 Senior Notes    
Long-term debt:    
Long-term Debt, Fair Value 122.3 130.8
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $316 Million 1.5% 2025 Senior Notes [Domain]    
Long-term debt:    
Long-term Debt, Fair Value 352.4 352.9
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $1.075 Billion 5.75% 2025 Senior Notes [Member]    
Long-term debt:    
Long-term Debt, Fair Value 962.0 1,029.3
Senior Notes [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | $800 Million 6.25% 2040 Senior Notes [Member]    
Long-term debt:    
Long-term Debt, Fair Value 232.8 227.1
Line of Credit [Member] | Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ABL Facility [Member]    
Long-term debt:    
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]    
Long-term debt:    
Long-term Debt, Fair Value $ 0.0 $ 0.0