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Debt (Gain (Loss) on Extinguishment of Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 5.4	$ (1.9)	$ (35.7)
Term Loan B prepayments
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	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)
New debt issuance costs
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			(11.0)
Capitalized & Amortized Over Life of New Issuances			11.6
Total			22.6
Previously incurred debt issuance costs or unamortized discount
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ (24.7)

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Debt Instrument, Debt Issuance and Redemption Costs, Total

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Amount of amortization expense attributable to debt issuance costs.

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

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