Employee Benefit Plans - Change in Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at the beginning of the year	$ 70.0	$ 72.7
Service cost	1.6	1.7
Interest cost	1.0	0.9
Actuarial losses (gains)	8.2	(2.6)
Benefits paid	(1.5)	(1.5)
Foreign currency exchange rate changes	3.7	(1.2)
Projected benefit obligation at the end of the year	83.0	70.0
Accumulated benefit obligation at the end of the year	$ 76.3	$ 65.1
Weighted average assumptions:
Discount rate	0.93%	1.48%
Rate of compensation increase	3.01%	2.77%