Other Income and Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expense [Abstract]
Interest income		$ 0.5	$ 0.4	$ 0.4
Foreign currency transactions	[1]	0.6	(2.4)	(2.3)
Net periodic benefit cost	[2]	(3.3)	(3.0)	(2.9)
Equity in earnings of non-consolidated affiliate	[3]	0.0	0.2	0.7
Total other expense - net		$ (2.2)	(4.8)	(4.1)
Nikkei Heat Exchanger Company, Ltd [Member]
Other Income and Expense [Abstract]
Equity in earnings of non-consolidated affiliate			0.1	$ 0.7
Other Income and Expenses [Abstract]
Gain on sale of ownership interest			$ 0.1

[1] Foreign currency transactions primarily consist of foreign currency transaction gains and losses on the re-measurement or settlement of foreign currency-denominated assets and liabilities, including intercompany loans and transactions denominated in a foreign currency, along with gains and losses on foreign currency exchange contracts.

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

[3] During fiscal 2020, the Company sold its ownership interest in Nikkei Heat Exchanger Company, Ltd. As a result of the sale, the Company recorded a gain of $0.1 million, which is included within the fiscal 2020 amount.  See Note 1 for additional information.