Pensions (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net Periodic Benefit Cost [Abstract]
Net periodic benefit cost	[1]	$ 0.3	$ 0.7	$ 0.5	$ 1.5
Pension [Member]
Net Periodic Benefit Cost [Abstract]
Service cost		0.0	0.1	0.1	0.2
Interest cost		1.9	1.9	3.7	3.9
Expected return on plan assets		(3.2)	(2.8)	(6.4)	(5.7)
Amortization of unrecognized net loss		1.7	1.8	3.4	3.5
Net periodic benefit cost		$ 0.4	$ 1.0	0.8	$ 1.9
Pension [Member] | U.S. Plans [Member]
Employer Contributions [Abstract]
Employer contributions				$ 3.5

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