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Fair Value Measurements (Carrying Values And Fair Values Of Assets and Liabilities Not Required to be Carried at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2019	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 | Term Loan | Term Loan A Facility
Liabilities:
Loans, fair value disclosure		$ 725.0	$ 733.3
Carrying Value | Term Loan | Term Loan B Facility
Liabilities:
Loans, fair value disclosure		1,088.7	1,091.2
Carrying Value | Senior Notes | 5.875% Senior Notes
Liabilities:
Senior Notes, fair value disclosure		503.4	502.8
Carrying Value | Senior Notes | 6.375% Senior Notes
Liabilities:
Senior Notes, fair value disclosure		542.0	541.4
Carrying Value | Production Loans | Production Loans
Liabilities:
Loans, fair value disclosure		380.5	385.4
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A Facility
Liabilities:
Loans, fair value disclosure	[1]	732.3	742.5
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B Facility
Liabilities:
Loans, fair value disclosure	[1]	1,094.7	1,088.1
Fair Value | Fair Value (Level 2) | Senior Notes | 5.875% Senior Notes
Liabilities:
Senior Notes, fair value disclosure	[1]	533.0	534.3
Fair Value | Fair Value (Level 2) | Senior Notes | 6.375% Senior Notes
Liabilities:
Senior Notes, fair value disclosure	[1]	574.8	576.1
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans
Liabilities:
Loans, fair value disclosure	[1]	$ 381.4	$ 386.4
[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).

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