Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2020	Apr. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease expense under operating leases	$ 18.3	$ 18.9
Financing lease obligation			$ 27.9
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing lease obligation				$ (23.0)
Property, Plant and Equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing lease obligation			4.6
Other Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Financing lease obligation			$ 3.0