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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, 2020	Mar. 31, 2019
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%
Carrying Value | Senior Notes | 5.875% Senior Notes
Liabilities:
Senior Notes, fair value disclosure	$ 504.0	$ 502.8
Carrying Value | Senior Notes | 6.375% Senior Notes
Liabilities:
Senior Notes, fair value disclosure	539.2	541.4
Carrying Value | Production Loans | Production Loans
Liabilities:
Loans, fair value disclosure	151.3	385.4
Carrying Value | Term Loan | Term Loan A
Liabilities:
Loans, fair value disclosure	699.8	733.3
Carrying Value | Term Loan | Term Loan B
Liabilities:
Loans, fair value disclosure	952.9	1,091.2
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes
Liabilities:
Senior Notes, fair value disclosure	430.5	534.3
Fair Value | Fair Value (Level 2) | Senior Notes | 6.375% Senior Notes
Liabilities:
Senior Notes, fair value disclosure	452.9	576.1
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans
Liabilities:
Loans, fair value disclosure	151.3	386.4
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A
Liabilities:
Loans, fair value disclosure	637.7	742.5
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B
Liabilities:
Loans, fair value disclosure	$ 845.7	$ 1,088.1

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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