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Revenue Recognition (Details) $ in Millions		1 Months Ended	3 Months Ended
Revenue Recognition (Details) $ in Millions	Apr. 01, 2026 segment	Mar. 31, 2026 USD ($)	Jun. 30, 2026 USD ($) item	Jun. 30, 2025 USD ($)
Disaggregation of Revenue [Abstract]
Number of new segments due to split of operating segment \| segment	2
Disaggregation of revenue			$ 874.1	$ 682.8
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Contract assets		$ 43.6	78.3
Contract liabilities		194.5	199.2
Increase in contract assets			34.7
Deposit from Customer to Support Company's Investments		165.0
Increase (decrease) in contract liabilities			4.7
Contract liabilities current		23.9	25.7
Contract liabilities noncurrent		$ 170.6	173.5
Americas
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			614.1	429.7
Europe
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			213.7	198.7
Asia
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			60.2	55.0
Heat Transfer Solutions
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			172.5	161.8
HVAC Technologies
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			75.4	51.9
Heavy-duty equipment
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			107.6	106.3
On-highway applications
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			170.2	179.2
Data Center Cooling Solutions
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			$ 348.4	183.6
Performance Technologies
Disaggregation of Revenue [Abstract]
Number of product groups in a segment \| item			2
Disaggregation of revenue			$ 277.8	285.5
Performance Technologies \| Americas
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			138.3	153.0
Performance Technologies \| Europe
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			85.6	84.0
Performance Technologies \| Asia
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			53.9	48.5
Performance Technologies \| Heavy-duty equipment
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			107.6	106.3
Performance Technologies \| On-highway applications
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			$ 170.2	179.2
Commercial HVAC
Disaggregation of Revenue [Abstract]
Number of product groups in a segment \| item			2
Disaggregation of revenue			$ 247.9	213.7
Commercial HVAC \| Americas
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			178.0	135.9
Commercial HVAC \| Europe
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			77.3	71.8
Commercial HVAC \| Asia
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			6.3	6.5
Commercial HVAC \| Heat Transfer Solutions
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			172.5	161.8
Commercial HVAC \| HVAC Technologies
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			75.4	51.9
Data Centers
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			348.4	183.6
Data Centers \| Americas
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			297.8	140.8
Data Centers \| Europe
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			50.8	42.9
Data Centers \| Data Center Cooling Solutions
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			348.4	183.6
Operating segments
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			888.0	683.4
Operating segments \| Performance Technologies
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			277.8	285.5
Operating segments \| Commercial HVAC
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			261.6	214.2
Operating segments \| Data Centers
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			348.6	183.7
Inter-segment Sales
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			13.9	0.6
Inter-segment Sales \| Commercial HVAC
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			13.7	0.5
Inter-segment Sales \| Data Centers
Disaggregation of Revenue [Abstract]
Disaggregation of revenue			$ 0.2	$ 0.1