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Fair Value Measurements - Table 2 (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Revolving Credit Facility [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 335.0 $ 30.0
Revolving Credit Facility [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 335.0 30.0
Letters of Credit [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 0.0 0.0
Letters of Credit [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 39.1 37.4
Term Loan Facilities [Member] | Term Loan Facilities [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 272.8 280.1
Term Loan Facilities [Member] | Term Loan Facilities [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 273.8 $ 281.3
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 5.125% 5.125%
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 297.0 $ 296.6
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 305.3 $ 298.5
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 5.75% 5.75%
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 1,095.5 $ 1,194.7
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 1,120.1 $ 1,200.0
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt instrument interest rate (percent) 5.75% 5.75%
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 345.3 $ 345.0
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 364.9 339.5
Other Notes Payable [Member] | Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments 16.9 104.2
Other Notes Payable [Member] | Estimated Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carrying amounts and estimated fair values of financial instruments $ 16.9 $ 104.2