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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	Dec. 31, 2020	Mar. 31, 2020
Other Non-Current Assets | Interest rate swaps, financing element
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	$ 100.7
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	$ 156.9	$ 0.0
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	663.5	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	945.3	952.9
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	506.1	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	540.4	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	318.9	151.3
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	154.9	0.0
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	652.9	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	931.9	845.7
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	526.5	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	559.3	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	$ 320.1	$ 151.3

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- Definition

Carrying value as of the balance sheet date of hybrid instruments.

+ References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

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+ References

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- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

+ References

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- Definition

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+ References

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-SubTopic 10
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-Paragraph 1
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