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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 233.9		$ 233.9
Goodwill, ending balance	$ 290.7			290.7
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	305.3			305.3		$ 231.1
Accumulated Amortization	(97.7)			(97.7)		(84.4)
Net Intangible Assets	207.6			207.6		146.7
Amortization expense	4.9		$ 6.9	10.6	$ 13.8
Estimated Future Amortization Expense [Abstract]
2026	10.0			10.0
2027	21.0			21.0
2028	21.0			21.0
2029	20.0			20.0
2030	19.0			19.0
2031	19.0			19.0
Climate Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance		233.9		233.9
Acquisitions				50.4
Effect of exchange rate changes				6.4
Goodwill, ending balance	290.7			290.7
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	198.4			198.4		145.4
Accumulated Amortization	(56.5)			(56.5)		(47.5)
Net Intangible Assets	141.9			141.9		97.9
Intangible assets acquired				48.1
Trade names
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	69.9			69.9		53.1
Accumulated Amortization	(23.3)			(23.3)		(21.2)
Net Intangible Assets	46.6			46.6		31.9
Intangible assets acquired				15.7
Acquired technology
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	37.0			37.0		32.6
Accumulated Amortization	(17.9)			(17.9)		(15.7)
Net Intangible Assets	$ 19.1			19.1		$ 16.9
Intangible assets acquired				3.5
L.B. White
Goodwill [Roll Forward]
Acquisitions		$ 25.7
Climate by Design
Goodwill [Roll Forward]
Acquisitions				23.6
AbsolutAire
Goodwill [Roll Forward]
Acquisitions				$ 1.1

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Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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