Income Taxes, Unrecognized Tax Benefits and Deferred Tax Asset Valuation Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Income Taxes [Abstract]
Increase (decrease) in deferred tax asset valuation allowances	$ 22.0	$ 9.2
Income tax benefit from allocation of income tax provision	(9.3)
Income tax expense related to legal entity restructuring		2.9
Lapse of statute of limitations and settlements		4.5
Income tax benefit related to manufacturing deduction			$ (2.5)
Income tax benefit related to US Tax Reform			(7.7)
Reduction in provisional charge related to US Tax Reform			(9.3)
Transition tax liability			18.9
Reduction in transition tax liability			(0.1)
Charge for reduction in state deferred tax assets			1.7
Changes in deferred tax asset valuation allowance related to US Tax Reform			4.3
Lapse of statute of limitations	(0.5)	(2.4)	(2.2)
Income Taxes [Abstract]
Tax benefit from recognition of tax credits			(14.5)
U.S. [Member]
Income Taxes [Abstract]
Income tax benefit from impairment charges	$ (24.4)
Increase (decrease) in deferred tax asset valuation allowances		8.4
Term of cumulative loss position	3 years
Foreign Jurisdictions [Member]
Income Taxes [Abstract]
Income tax benefit from impairment charges	$ (13.3)
Increase (decrease) in deferred tax asset valuation allowances		(1.3)	$ (1.0)
Term of cumulative loss position	3 years
Italy [Member]
Income Taxes [Abstract]
Tax benefit from recognition of tax credits		$ (1.4)
Deferred Tax Assets for Charges Recorded [Member]
Income Taxes [Abstract]
Increase (decrease) in deferred tax asset valuation allowances	$ 116.5
Deferred Tax Assets for Charges Recorded [Member] | U.S. [Member]
Income Taxes [Abstract]
Increase (decrease) in deferred tax asset valuation allowances	103.3
Deferred Tax Assets for Charges Recorded [Member] | Foreign Jurisdictions [Member]
Income Taxes [Abstract]
Increase (decrease) in deferred tax asset valuation allowances	$ 13.2