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Fair Value of Debt (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Revolving Credit Facility [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Line of Credit Facility, Amount Outstanding $ 0.0 $ 0.0
Revolving Credit Facility [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Line of Credit Facility, Amount Outstanding 0.0 0.0
Term Loan A [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 92.5 92.5
Term Loan A [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 92.8 92.5
Term Loan B [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 1,526.8 1,526.8
Term Loan B [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 1,533.0 1,528.7
7.75% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 200.0 200.0
7.75% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 211.5 217.5
6.625% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 550.0 550.0
6.625% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 567.9 570.2
6.50% Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 500.0 500.0
6.50% Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 499.8 527.5
6.25% Notes Due 2026 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 400.0 0.0
6.25% Notes Due 2026 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 397.4 0.0
6.25% Notes due 2025 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 700.0 0.0
6.25% Notes due 2025 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 697.3 0.0
6.25% Notes Due 2021 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 16.9 400.0
6.25% Notes Due 2021 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt $ 17.2 $ 410.0