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Goodwill and Intangible Assets (Details) $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2023 USD ($) Facility	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance				$ 165.6
Acquisition	[1]			0.3
Effect of exchange rate changes				(1.6)
Goodwill, ending balance		$ 164.3		164.3
Number of coatings facilities sold | Facility		2
Intangible Assets [Abstract]
Gross carrying value		$ 134.6		134.6		$ 133.0
Accumulated amortization		(55.3)		(55.3)		(51.9)
Net intangible assets		79.3		79.3		81.1
Amortization expense		2.0	$ 2.0	4.0	$ 4.0
Estimated Future Amortization Expense [Abstract]
Remainder of fiscal 2024		4.0		4.0
2025		8.0		8.0
2026		8.0		8.0
2027		8.0		8.0
2028		8.0		8.0
2029		7.0		7.0
Climate Solutions [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance				105.7
Acquisition		1.0		1.0
Effect of exchange rate changes				(1.5)
Goodwill, ending balance		105.2		105.2
Performance Technologies [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance				59.9
Disposition		(0.7)		(0.7)
Effect of exchange rate changes				(0.1)
Goodwill, ending balance		59.1		59.1
Customer Relationships [Member]
Intangible Assets [Abstract]
Gross carrying value		62.2		62.2		60.3
Accumulated amortization		(24.9)		(24.9)		(23.4)
Net intangible assets		37.3		37.3		36.9
Trade Names [Member]
Intangible Assets [Abstract]
Gross carrying value		49.8		49.8		50.1
Accumulated amortization		(17.0)		(17.0)		(15.9)
Net intangible assets		32.8		32.8		34.2
Acquired Technology [Member]
Intangible Assets [Abstract]
Gross carrying value		22.6		22.6		22.6
Accumulated amortization		(13.4)		(13.4)		(12.6)
Net intangible assets		9.2		$ 9.2		$ 10.0
Customer Relationships and Acquired Technology [Member]
Intangible Assets [Abstract]
Intangible assets acquired		$ 2.9
[1] During the second quarter of fiscal 2024, the Company recorded $1.0 million of goodwill in connection with its acquisition of Napps. In addition, the Company wrote-off $0.7 million of goodwill in connection with the sale of two coatings facilities.  See Note 2 for additional information.

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