Segment Information - Capital expenditures and depreciation and amortization expense by segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Information
Capital expenditures	$ 31.9	$ 13.5	$ 59.4	$ 40.3
Depreciation and amortization expense	19.7	20.0	38.7	39.1
Operating segments | Climate Solutions
Segment Information
Capital expenditures	26.8	7.7	46.7	23.7
Depreciation and amortization expense	11.4	12.6	22.6	24.5
Operating segments | Performance Technologies
Segment Information
Capital expenditures	5.1	5.7	12.4	16.5
Depreciation and amortization expense	7.8	7.2	15.3	14.2
Corporate and eliminations
Segment Information
Capital expenditures		0.1	0.3	0.1
Depreciation and amortization expense	$ 0.5	$ 0.2	$ 0.8	$ 0.4