Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill
Beginning Balance		$ 222.1	$ 186.3
Goodwill, Transfers			0.0
Goodwill, Written off Related to Sale of Business Unit		(4.6)	(4.6)
Goodwill, Acquired During Period			40.4
Goodwill, adjustment		(2.1)
Ending Balance		220.0	222.1
Goodwill, accumulated impairment losses				$ 32.7
AES
Goodwill
Beginning Balance		40.4
Goodwill, adjustment		(2.1)
Ending Balance		38.3	40.4
Discontinued Operations, Disposed of by Sale [Member] | European Commercial HVAC and Refrigeration Operations
Goodwill
Impairment of Long-Lived Assets to be Disposed of, Goodwill	$ 2.3
Segment Reporting, Reconciling Item, Corporate Nonsegment
Goodwill
Beginning Balance		0.0	0.0
Goodwill, Transfers			4.6
Goodwill, Written off Related to Sale of Business Unit			(4.6)
Goodwill, Acquired During Period			0.0
Goodwill, adjustment
Ending Balance		0.0	0.0
Residential Heating & Cooling [Member] | Operating Segments
Goodwill
Beginning Balance		26.1	26.1
Goodwill, Transfers			0.0
Goodwill, Written off Related to Sale of Business Unit			0.0
Goodwill, Acquired During Period			0.0
Goodwill, adjustment		0.0
Ending Balance		26.1	26.1
Commercial Heating & Cooling [Member] | Operating Segments
Goodwill
Beginning Balance		196.0	61.1
Goodwill, Transfers			94.5
Goodwill, Written off Related to Sale of Business Unit			0.0
Goodwill, Acquired During Period			40.4
Goodwill, adjustment		(2.1)
Ending Balance		193.9	196.0
Refrigeration [Member] | Operating Segments
Goodwill
Beginning Balance		0.0	99.1
Goodwill, Transfers			(99.1)
Goodwill, Written off Related to Sale of Business Unit			0.0
Goodwill, Acquired During Period			0.0
Goodwill, adjustment		0.0
Ending Balance		$ 0.0	$ 0.0