Other Income and Expense (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Sep. 30, 2019		Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
Other Income and Expense [Abstract]
Equity in earnings of non-consolidated affiliate		$ 0.1	[1]	$ 0.2	$ 0.2	[1]	$ 0.4
Interest income		0.1		0.1	0.2		0.3
Foreign currency transactions	[2]	(0.8)		(0.1)	(1.4)		(0.9)
Net periodic benefit cost	[3]	(0.7)		(0.7)	(1.4)		(1.4)
Total other expense - net		(1.3)		$ (0.5)	(2.4)		$ (1.6)
Nikkei Heat Exchanger Company, Ltd [Member]
Other Income and Expenses [Abstract]
Gain on sale of ownership interest		$ 0.1			$ 0.1

[1] The amounts reported in fiscal 2020 include a $0.1 million gain recorded as a result of the Company's sale of its ownership interest in NEX.  See Note 1 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 certain foreign currency exchange contracts.

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