Other Income and Expense (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Dec. 31, 2019		Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019		Dec. 31, 2018
Other Income and Expense [Abstract]
Equity in earnings of non-consolidated affiliate		$ 0.0	[1]		$ 0.3	$ 0.2	[1]	$ 0.7
Interest income		0.1			0.0	0.3		0.3
Foreign currency transactions	[2]	0.7			(0.2)	(0.7)		(1.1)
Net periodic benefit cost	[3]	(0.7)			(0.6)	(2.1)		(2.0)
Total other income (expense) - net		$ 0.1			$ (0.5)	(2.3)		$ (2.1)
Nikkei Heat Exchanger Company, Ltd [Member]
Other Income and Expenses [Abstract]
Gain on sale of ownership interest				$ 0.1		$ 0.1

[1] During the second quarter of fiscal 2020, the Company sold its ownership interest in NEX and, as a result, recorded a gain of $0.1 million.  This gain is included within the year-to-date amount reported in fiscal 2020.  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.