Pension and Employee Benefit Plans, Defined Benefit Employee Benefit Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined benefit plan, plan assets [Abstract]
Net periodic benefit cost (income)	[1]	$ 3.0	$ 2.9	$ 3.3
Pension Plans [Member]
Defined benefit plan, plan assets [Abstract]
Employer contributions		5.8	13.9
Net periodic benefit cost (income)		3.7	3.6	4.1
Pension Plans [Member] | U.S. Plans [Member]
Defined benefit plan, plan assets [Abstract]
Employer contributions		3.5	8.0	13.4
Pension Plans [Member] | Non-U.S Plans [Member]
Defined benefit plan, plan assets [Abstract]
Employer contributions		2.3	5.9	2.6
Postretirement Plans [Member]
Defined benefit plan, plan assets [Abstract]
Net periodic benefit cost (income)		$ (0.3)	$ (0.3)	$ (0.2)

[1] Net periodic benefit cost for the Company’s pension and postretirement plans is exclusive of service cost.