Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Mar. 31, 2025
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 233.9
Goodwill, ending balance	$ 293.4		293.4
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	306.7		306.7		$ 231.1
Accumulated Amortization	(103.3)		(103.3)		(84.4)
Net Intangible Assets	203.4		203.4		146.7
Amortization expense	5.2	$ 6.9	15.8	$ 20.7
Estimated Future Amortization Expense [Abstract]
2026	5.0		5.0
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
Acquisitions			51.8
Effect of exchange rate changes			7.7
Goodwill, ending balance	293.4		293.4
Customer relationships
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	199.7		199.7		145.4
Accumulated Amortization	(60.3)		(60.3)		(47.5)
Net Intangible Assets	139.4		139.4		97.9
Intangible assets acquired			48.1
Trade names
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Value	70.0		70.0		53.1
Accumulated Amortization	(24.3)		(24.3)		(21.2)
Net Intangible Assets	45.7		45.7		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	(18.7)		(18.7)		(15.7)
Net Intangible Assets	$ 18.3		18.3		$ 16.9
Intangible assets acquired			3.5
L.B. White
Goodwill [Roll Forward]
Acquisitions			27.1
Climate by Design
Goodwill [Roll Forward]
Acquisitions			23.6
AbsolutAire
Goodwill [Roll Forward]
Acquisitions			$ 1.1