XML 58 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1
Fair Value Measurements - Table 2 (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
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 $ 150.0 $ 95.0
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 150.0 95.0
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 38.1 35.4
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 287.4 294.7
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 $ 288.8 $ 296.3
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 $ 296.3 $ 295.9
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 $ 303.0 $ 306.8
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 $ 1,194.3 $ 1,193.9
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 $ 1,212.0 $ 1,228.5
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 $ 344.7 $ 344.4
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 354.9 364.9
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 96.3 82.3
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 $ 96.3 $ 82.3