Other Income and Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Other Income and Expense [Abstract]
Equity in earnings of non-consolidated affiliate	[1]	$ 0.2	$ 0.7	$ 0.2
Interest income		0.4	0.4	0.4
Foreign currency transactions	[2]	(2.4)	(2.3)	(0.6)
Net periodic benefit cost	[3]	(3.0)	(2.9)	(3.3)
Total other expense - net		(4.8)	$ (4.1)	$ (3.3)
Nikkei Heat Exchanger Company, Ltd [Member]
Other Income and Expenses [Abstract]
Gain on sale of ownership interest		$ 0.1

[1] 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 12 for additional information.

[2] 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.

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