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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, 2021	Mar. 31, 2020
Other Non-Current Assets | Interest Rate Swap, Financing
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]
Financing element of certain hybrid instruments	$ 98.2
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
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]
Financing component of interest rate swaps, fair value disclosure	$ 152.5	$ 0.0
Carrying Value | 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]
Senior Notes, fair value disclosure	506.7	504.0
Carrying Value | 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]
Senior Notes, fair value disclosure	540.8	539.2
Carrying Value | Production Loans | Production Loans
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]
Loans, fair value disclosure	372.5	151.3
Carrying Value | Term Loan | Term Loan A
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]
Loans, fair value disclosure	651.4	699.8
Carrying Value | Term Loan | Term Loan B
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]
Loans, fair value disclosure	942.8	952.9
Carrying Value | Production Tax Credit Facility | Production Tax Credit Facility
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]
Production tax credit facility, fair value disclosure	116.5	0.0
Fair Value | Fair Value (Level 2)
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]
Financing component of interest rate swaps, fair value disclosure	144.7	0.0
Fair Value | Fair Value (Level 2) | 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]
Senior Notes, fair value disclosure	533.9	430.5
Fair Value | Fair Value (Level 2) | 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]
Senior Notes, fair value disclosure	563.0	452.9
Fair Value | Fair Value (Level 2) | Production Loans | Production Loans
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]
Loans, fair value disclosure	373.5	151.3
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan A
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]
Loans, fair value disclosure	647.6	637.7
Fair Value | Fair Value (Level 2) | Term Loan | Term Loan B
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]
Loans, fair value disclosure	936.0	845.7
Fair Value | Fair Value (Level 2) | Production Tax Credit Facility | Production Tax Credit Facility
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]
Production tax credit facility, fair value disclosure	$ 120.0	$ 0.0

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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Contractual interest rate for funds borrowed, under the debt agreement.

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