Restructuring Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring and repositioning expenses [Abstract]
Employee severance and related benefits	$ 1.8	$ 0.0	$ 3.3	$ 0.1
Other restructuring and repositioning expenses	0.5	0.0	0.8	0.1
Total	2.3	0.0	4.1	0.2
Changes in accrued severance [Roll Forward]
Beginning balance	7.8	4.8	10.0	11.0
Additions	1.8	0.0	3.3	0.1
Payments	(2.0)	(1.4)	(5.7)	(7.2)
Effect of exchange rate changes	(0.2)	0.0	(0.2)	(0.5)
Ending balance	$ 7.4	$ 3.4	$ 7.4	$ 3.4