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Fair Value Measurements (Carrying Values of Assets and Liabilities Not Required to Be Carried at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Apr. 15, 2018
Mar. 31, 2018
Senior Notes | 5.875% Senior Notes      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried At Fair Value on a Recurring Basis [Line Items]      
Coupon rate 5.875%    
Senior Notes | 6.375% Senior Notes      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried At Fair Value on a Recurring Basis [Line Items]      
Coupon rate 6.375%    
Convertible Senior Subordinated Notes | April 2013 Notes      
Fair Value, Carrying Values and Fair Values of Assets and Liabilities Not Required to be Carried At Fair Value on a Recurring Basis [Line Items]      
Coupon rate 1.25% 1.25%  
Carrying Value      
Liabilities:      
Total liabilities, fair value disclosure $ 2,712.7   $ 2,872.0
Carrying Value | Senior Notes | 5.875% Senior Notes      
Liabilities:      
Senior Notes, fair value disclosure 502.8   500.4
Carrying Value | Senior Notes | 6.375% Senior Notes      
Liabilities:      
Senior Notes, fair value disclosure 541.4   0.0
Carrying Value | Convertible Senior Subordinated Notes | April 2013 Notes      
Liabilities:      
Convertible notes, fair value disclosures 0.0   60.0
Carrying Value | Production Loans | Production Loans      
Liabilities:      
Loans, fair value disclosure 385.4   352.6
Carrying Value | Term Loan | Term Loan A Facility      
Liabilities:      
Loans, fair value disclosure 733.3   729.7
Carrying Value | Term Loan | Term Loan B Facility      
Liabilities:      
Loans, fair value disclosure 1,091.2   1,229.3
Fair Value | Fair Value (Level 2)      
Liabilities:      
Total liabilities, fair value disclosure [1] 2,891.3   2,955.2
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes      
Liabilities:      
Senior Notes, fair value disclosure [1] 534.3   539.5
Fair Value | Fair Value (Level 2) | Senior Notes | 6.375% Senior Notes      
Liabilities:      
Senior Notes, fair value disclosure [1] 576.1   0.0
Fair Value | Fair Value (Level 2) | Convertible Senior Subordinated Notes | April 2013 Notes      
Liabilities:      
Convertible notes, fair value disclosures [1] 0.0   60.3
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans      
Liabilities:      
Loans, fair value disclosure [1] 386.4   352.9
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A Facility      
Liabilities:      
Loans, fair value disclosure [1] 742.5   750.9
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B Facility      
Liabilities:      
Loans, fair value disclosure [1] $ 1,088.1   $ 1,251.6
[1] The Company measures the fair value of its outstanding debt using discounted cash flow techniques that use observable market inputs, such as LIBOR-based yield curves, swap rates, and credit ratings (Level 2 measurements).