Income Taxes (Current and Deferred Income Tax Provision (Benefits)) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Current provision (benefit):
Federal	$ 5.0	$ (0.6)	$ 9.1
States	2.9	3.0	(0.7)
International	5.8	1.8	6.7
Total current provision (benefit)	13.7	4.2	15.1
Deferred provision (benefit):
Federal	1.1	(18.5)	(48.2)
States	2.3	(1.8)	5.8
International	0.0	19.4	18.8
Total deferred provision (benefit)	3.4	(0.9)	(23.6)
Total provision (benefit) for income taxes	$ 17.1	$ 3.3	$ (8.5)

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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