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Debt (Narrative - Debt Transactions) (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 15, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2021	Feb. 04, 2019
Term Loan | Term Loan B
Debt Instrument [Line Items]
Cash paid for repurchases of debt		$ 22.0
Debt instrument, principal amount repurchased		28.0
Principal amount of debt prepaid		101.9	$ 130.0
Senior Notes | 5.875% Senior Notes
Debt Instrument [Line Items]
Cash paid for repurchases of debt		1.0
Debt instrument, principal amount repurchased		1.3
Coupon rate				5.875%
Senior Notes | 6.375% Senior Notes
Debt Instrument [Line Items]
Cash paid for repurchases of debt		3.5
Debt instrument, principal amount repurchased		$ 4.4
Principal amount of notes					$ 550.0
Coupon rate				6.375%
Convertible Senior Subordinated Notes | April 2013 Notes
Debt Instrument [Line Items]
Principal amount of debt prepaid	$ 60.0
Coupon rate	1.25%

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

+ References

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