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Revenue Recognition (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Revenue Recognition (Details) - USD ($) $ in Millions	Mar. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Abstract]
Net sales		$ 3,181.1	$ 2,583.5	$ 2,407.8
Contract Balances [Abstract]
Contract assets	$ 43.6	43.6	13.3
Contract liabilities	194.5	194.5	35.1
Increase in contract assets		30.3
Deposit from Customer to Support Company's Investments	165.0
Increase (decrease) in contract liabilities		159.0	(44.5)	58.3
Increase (decrease) in contract liabilities		159.4
Contract liabilities current	23.9	23.9	33.2
Contract liabilities noncurrent	$ 170.6	170.6	1.9
Americas
Disaggregation of Revenue [Abstract]
Net sales		2,129.3	1,693.4	1,370.0
Europe
Disaggregation of Revenue [Abstract]
Net sales		838.2	711.7	839.5
Asia
Disaggregation of Revenue [Abstract]
Net sales		$ 226.6	199.2	219.9
Maximum
Revenue Recognition [Abstract]
Period of time after billing when payment is received		90 days
Data centers
Disaggregation of Revenue [Abstract]
Net sales		$ 1,112.1	644.2	294.2
Heat Transfer Solutions
Disaggregation of Revenue [Abstract]
Net sales		584.1	539.4	606.4
HVAC Technologies
Disaggregation of Revenue [Abstract]
Net sales		359.2	257.0	207.5
Heavy-Duty Equipment
Disaggregation of Revenue [Abstract]
Net sales		409.3	422.1	463.3
On-Highway Applications
Disaggregation of Revenue [Abstract]
Net sales		716.4	720.8	836.4
Climate Solutions
Disaggregation of Revenue [Abstract]
Net sales		2,055.4	1,440.6	1,108.1
Climate Solutions \| Americas
Disaggregation of Revenue [Abstract]
Net sales		1,535.5	997.8	649.0
Climate Solutions \| Europe
Disaggregation of Revenue [Abstract]
Net sales		501.4	415.8	432.7
Climate Solutions \| Asia
Disaggregation of Revenue [Abstract]
Net sales		25.4	27.2	26.4
Climate Solutions \| Data centers
Disaggregation of Revenue [Abstract]
Net sales		1,112.1	644.2	294.2
Climate Solutions \| Heat Transfer Solutions
Disaggregation of Revenue [Abstract]
Net sales		584.1	539.4	606.4
Climate Solutions \| HVAC Technologies
Disaggregation of Revenue [Abstract]
Net sales		359.2	257.0	207.5
Climate Solutions \| Heavy-Duty Equipment
Disaggregation of Revenue [Abstract]
Net sales		0.0	0.0	0.0
Climate Solutions \| On-Highway Applications
Disaggregation of Revenue [Abstract]
Net sales		0.0	0.0	0.0
Proposed Performance Technologies Transaction
Disaggregation of Revenue [Abstract]
Net sales		1,125.7	1,142.9	1,299.7
Proposed Performance Technologies Transaction \| Americas
Disaggregation of Revenue [Abstract]
Net sales		593.8	695.6	721.0
Proposed Performance Technologies Transaction \| Europe
Disaggregation of Revenue [Abstract]
Net sales		336.8	295.9	406.8
Proposed Performance Technologies Transaction \| Asia
Disaggregation of Revenue [Abstract]
Net sales		201.2	172.0	193.5
Proposed Performance Technologies Transaction \| Data centers
Disaggregation of Revenue [Abstract]
Net sales		0.0	0.0	0.0
Proposed Performance Technologies Transaction \| Heat Transfer Solutions
Disaggregation of Revenue [Abstract]
Net sales		0.0	0.0	0.0
Proposed Performance Technologies Transaction \| HVAC Technologies
Disaggregation of Revenue [Abstract]
Net sales		0.0	0.0	0.0
Proposed Performance Technologies Transaction \| Heavy-Duty Equipment
Disaggregation of Revenue [Abstract]
Net sales		409.3	422.1	463.3
Proposed Performance Technologies Transaction \| On-Highway Applications
Disaggregation of Revenue [Abstract]
Net sales		716.4	720.8	836.4
Operating Segments
Disaggregation of Revenue [Abstract]
Net sales		3,194.1	2,604.3	2,429.4
Operating Segments \| Climate Solutions
Disaggregation of Revenue [Abstract]
Net sales		2,062.3	1,440.8	1,108.1
Operating Segments \| Proposed Performance Technologies Transaction
Disaggregation of Revenue [Abstract]
Net sales		1,131.8	1,163.5	1,321.3
Inter-segment sales
Disaggregation of Revenue [Abstract]
Net sales		13.0	20.8	21.6
Inter-segment sales \| Climate Solutions
Disaggregation of Revenue [Abstract]
Net sales		6.9	0.2	0.0
Inter-segment sales \| Proposed Performance Technologies Transaction
Disaggregation of Revenue [Abstract]
Net sales		$ 6.1	$ 20.6	$ 21.6