Product Warranties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017		Dec. 31, 2016
Changes in accrued warranty costs [Roll Forward]
Beginning balance	$ 9.4	$ 8.4	$ 10.0		$ 8.3
Warranties recorded at time of sale	2.0	1.4	4.7		3.9
Adjustments to pre-existing warranties	0.2	0.1	0.0		0.0
Additions and adjustments due to acquisition	0.0	4.1	(1.0)	[1]	4.1	[1]
Settlements	(2.1)	(2.1)	(4.6)		(4.4)
Effect of exchange rate changes	0.1	(0.3)	0.5		(0.3)
Ending balance	$ 9.6	$ 11.6	$ 9.6		$ 11.6

[1] During fiscal 2018, the Company decreased its liability for product warranties by $1.0 million as a result of measurement period adjustments made in connection with purchase accounting for the acquisition of Luvata HTS. See Note 2 for additional information.