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Goodwill (Details) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
Goodwill (Details) $ in Millions	Sep. 30, 2023 facility	Jun. 30, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance		$ 230.9	$ 230.9
Ending balance			233.9	$ 230.9
Number of coatings facilities sold \| facility	2
Climate Solutions
Goodwill [Roll Forward]
Beginning balance		230.9	230.9	165.6
Acquisitions				66.2
Dispositions				(0.7)
Acquisition adjustment			7.4
Effect of exchange rate changes			(4.4)	(0.2)
Ending balance			233.9	230.9
Performance Technologies
Goodwill [Roll Forward]
Dispositions				(0.7)
Accumulated impairment losses			40.8	40.8
Scott Springfield Manufacturing
Goodwill [Roll Forward]
Beginning balance		65.2	65.2
Acquisition adjustment		$ 7.4
Ending balance				65.2
Scott Springfield Manufacturing \| Climate Solutions
Goodwill [Roll Forward]
Acquisitions				65.2
Acquisition adjustment			$ 7.4
Napps \| Climate Solutions
Goodwill [Roll Forward]
Acquisitions				$ 1.0