Acquisitions and Dispositions, Germany Automotive Businesses Held for Sale (Details) $ in Millions	6 Months Ended
	Sep. 30, 2023 USD ($) Business	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)
Assets [Abstract]
Cash and cash equivalents	$ 1.5		$ 0.0
Total assets held for sale	18.4		0.0
Liabilities [Abstract]
Total liabilities held for sale	$ 21.1		$ 0.0
Three Germany Automotive Businesses [Member]
Germany Automotive Businesses Held for Sale [Abstract]
Number of automotive businesses held for sale | Business	3
Net sales of businesses held for sale	$ 46.2	$ 36.6
Assets [Abstract]
Cash and cash equivalents	1.5
Trade accounts receivables - net	8.5
Inventories	5.4
Other current assets	0.8
Property, plant and equipment - net	1.6
Other noncurrent assets	0.6
Total assets held for sale	18.4
Liabilities [Abstract]
Accounts payable	6.6
Accrued compensation and employee benefits	3.6
Other current liabilities	1.9
Pensions	7.2
Other noncurrent liabilities	1.8
Total liabilities held for sale	$ 21.1