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Debt (Gain (loss) on Extinguishment of Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 0.0	$ 5.4	$ (1.9)
Senior Notes
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		1.1	0.0
Term Loan | Term Loan B, Repurchases
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		5.7	0.0
Term Loan | Term Loan B, Prepayments
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ (1.4)	$ (1.9)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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