Basis of Financial Statement Presentation - Revenue Recognition Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Period of product warranty			1 year
Contracts with customers, revenues recognized	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Capitalized contract costs	1.7		1.7		$ 2.2
Capitalized contract cost, amortization	$ 0.2	$ 0.2	$ 0.6	$ 0.7