Leases - Supplemental Cash Flow Information (Details) $ in Millions	12 Months Ended
	Mar. 31, 2020 USD ($)
Cash Flow, Lessee [Abstract]
Operating cash flows from operating leases	$ 14.4
Operating cash flows from finance leases	1.5
Financing cash flows from finance leases	0.4
Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract]
Operating leases	43.4
Finance leases	$ 1.0