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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		1 Months Ended	12 Months Ended
	Apr. 01, 2021	Apr. 30, 2022	Mar. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
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				$ 88.1	$ 98.2
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]
Principal amount of debt redeemed or repaid			$ 101.9
Term Loan | 2023 Term Loan A | Subsequent Event
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]
Principal amount of debt redeemed or repaid		$ 193.6
Senior Notes | 5.500% 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	5.50%			5.50%
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%			5.875%
Principal amount of debt redeemed or repaid	$ 518.7
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%			6.375%
Principal amount of debt redeemed or repaid	$ 545.6
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]
IP Credit Facility and Financing component of interest rate swaps, fair value disclosure				$ 134.0	152.5
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				631.9	651.4
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				837.5	942.8
Carrying Value | Senior Notes | 5.500% 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				965.8	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				0.0	506.7
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				0.0	540.8
Carrying Value | Production and Related Loans | Production and Related 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				1,281.2	489.0
Carrying Value | Secured Debt | IP Credit Facility and Other Financing Obligations
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]
IP Credit Facility and Financing component of interest rate swaps, fair value disclosure				120.6	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]
IP Credit Facility and Financing component of interest rate swaps, fair value disclosure				122.9	144.7
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				625.7	647.6
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				828.3	936.0
Fair Value | Fair Value (Level 2) | Senior Notes | 5.500% 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				962.5	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				0.0	533.9
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				0.0	563.0
Fair Value | Fair Value (Level 2) | Production and Related Loans | Production and Related 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				1,286.7	493.5
Fair Value | Fair Value (Level 2) | Secured Debt | IP Credit Facility and Other Financing Obligations
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]
IP Credit Facility and Financing component of interest rate swaps, fair value disclosure				$ 123.5	$ 0.0

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