Product Warranties (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in accrued warranty costs [Roll Forward]
Beginning balance		$ 10.1	$ 8.4	$ 10.0	$ 8.3
Warranties recorded at time of sale		1.4	1.1	2.7	2.5
Adjustments to pre-existing warranties		0.3	(0.2)	(0.2)	(0.1)
Adjustments due to acquisition	[1]	(1.0)	0.0	(1.0)	0.0
Settlements		(1.5)	(1.0)	(2.5)	(2.3)
Effect of exchange rate changes		0.1	0.1	0.4	0.0
Ending balance		$ 9.4	$ 8.4	$ 9.4	$ 8.4

[1] During the second quarter of 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.