Pension and Employee Benefit Plans, Cost Components of Pension Plans (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Net Periodic Benefit Cost [Abstract]
Net periodic benefit cost	[1]	$ 3.3	$ 3.0	$ 2.9
Other Changes in Benefit Obligation Recognized in Other Comprehensive Income (Loss) [Abstract]
Amortization of net actuarial loss	[2]	6.7	5.8
Pension Plans [Member]
Net Periodic Benefit Cost [Abstract]
Service cost		0.4	0.4	0.5
Interest cost		7.9	9.1	9.6
Expected return on plan assets		(11.5)	(12.0)	(12.3)
Amortization of net actuarial loss		6.9	6.0	5.6
Settlements	[3]	0.2	0.2	0.2
Net periodic benefit cost		3.9	3.7	3.6
Other Changes in Benefit Obligation Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain (loss)		33.8	(38.7)	(7.7)
Amortization of net actuarial loss		7.1	6.2	5.8
Total recognized in other comprehensive income (loss)		40.9	(32.5)	(1.9)
Estimated amortization of net actuarial loss during fiscal 2022		(6.6)
Pension Plans [Member] | Liquid and Air-Cooled Automotive Businesses [Member]
Other Changes in Benefit Obligation Recognized in Other Comprehensive Income (Loss) [Abstract]
Estimated amortization of net actuarial loss during fiscal 2022		(7.0)
Pension Plans [Member] | Non-U.S Plans [Member] | Maximum [Member]
Net Periodic Benefit Cost [Abstract]
Amortization of net actuarial loss		1.0	$ 1.0	$ 1.0
Other Changes in Benefit Obligation Recognized in Other Comprehensive Income (Loss) [Abstract]
Estimated amortization of net actuarial loss during fiscal 2022		$ 1.0

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

[2] Amounts are included in the calculation of net periodic benefit cost for the Company’s defined benefit plans, which include pension and other postretirement plans. See Note 18 for additional information about the Company’s pension plans.

[3] The settlement charges resulted from activity associated with the Company’s non-U.S. pension plans.