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Debt (Accounting for Credit Agreement amendment and Senior Notes redemption and issuance) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt	$ (57.4)	$ 28.2	$ 0.0
Revolving Credit Facility, Term Loan A and Senior Notes
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt		26.4
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances		62.1
Total		88.5
Revolving Credit Facility, Term Loan A and Senior Notes | New Debt Issuance Costs and Call Premiums
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt		21.2
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances		31.0
Total		52.2
Revolving Credit Facility, Term Loan A and Senior Notes | Previously Incurred Debt Issuance Costs
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt		5.2
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances		31.1
Total		36.3
Revolving Credit Facility
Debt Instrument [Line Items]
(Gain) loss on extinguishment of debt	$ 0.0	$ 1.1

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- Definition

Debt Instrument, Debt Issuance and Redemption Costs, Total

+ References

No definition available.

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- Definition

Debt Issuance Costs, Discounts and Call Premiums, Recorded As Reduction of Outstanding Debt, Amortized Over Life of New Issuances

+ References

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126972273&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
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-URI https://asc.fasb.org/extlink&oid=126972273&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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