Income Taxes, Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 9.6	$ 9.7	$ 13.8
Gross increases - tax positions in prior period		0.1	0.3
Gross decreases - tax positions in prior period		(0.6)	(1.0)
Gross increases - tax positions in current period		0.9	1.1
Settlements		0.0	(2.1)
Lapse of statute of limitations		(0.5)	(2.4)	$ (2.2)
Ending balance		9.6	9.7	$ 13.8
Unrecognized tax benefits that would impact effective tax rate		1.5
Lapse of statute of limitations and settlements			4.5
Unrecognized tax benefits accrued interest and penalties		$ 0.6	$ 0.5
Forecast [Member]
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Lapse of statute of limitations and settlements	$ 2.4