Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill
Beginning Balance		$ 186.3	$ 186.6
Goodwill, Foreign Currency Translation Gain (Loss)			(0.3)
Goodwill, Transfers		0.0
Goodwill, Written off Related to Sale of Business Unit		(4.6)
Goodwill, Acquired During Period		40.4
Ending Balance		222.1	186.3
Goodwill, accumulated impairment losses				$ 32.7
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
Corporate, Non-Segment
Goodwill
Beginning Balance		0.0	0.0
Goodwill, Foreign Currency Translation Gain (Loss)			0.0
Goodwill, Transfers		4.6
Goodwill, Written off Related to Sale of Business Unit		(4.6)
Goodwill, Acquired During Period		0.0
Ending Balance		0.0	0.0
Residential Heating & Cooling [Member] | Operating Segments
Goodwill
Beginning Balance		26.1	26.1
Goodwill, Foreign Currency Translation Gain (Loss)			0.0
Goodwill, Transfers		0.0
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Acquired During Period		0.0
Ending Balance		26.1	26.1
Commercial Heating & Cooling [Member] | Operating Segments
Goodwill
Beginning Balance		61.1	61.1
Goodwill, Foreign Currency Translation Gain (Loss)			0.0
Goodwill, Transfers		94.5
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Acquired During Period		40.4
Ending Balance		196.0	61.1
Refrigeration [Member] | Operating Segments
Goodwill
Beginning Balance		99.1	99.4
Goodwill, Foreign Currency Translation Gain (Loss)			(0.3)
Goodwill, Transfers		(99.1)
Goodwill, Written off Related to Sale of Business Unit		0.0
Goodwill, Acquired During Period		0.0
Ending Balance		$ 0.0	$ 99.1