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Revenue Recognition - Segment Sales Disaggregated by Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 902.6	$ 937.5	$ 2,905.7	$ 2,864.7
Operating Segments | North America
Disaggregation of Revenue [Line Items]
Net sales	703.3	709.9	2,260.3	2,184.9
Operating Segments | Rest of World
Disaggregation of Revenue [Line Items]
Net sales	210.3	233.4	682.0	696.7
Operating Segments | Rest of World | China
Disaggregation of Revenue [Line Items]
Net sales	174.6	201.3	593.4	609.2
Operating Segments | Rest of World | All other Rest of World
Disaggregation of Revenue [Line Items]
Net sales	35.7	32.1	88.6	87.5
Operating Segments | Water heaters and related parts | North America
Disaggregation of Revenue [Line Items]
Net sales	568.9	593.7	1,877.4	1,833.6
Operating Segments | Boilers and related parts | North America
Disaggregation of Revenue [Line Items]
Net sales	71.1	61.8	197.2	181.5
Operating Segments | Water treatment products and related parts | North America
Disaggregation of Revenue [Line Items]
Net sales	63.3	54.4	185.7	169.8
Inter-segment earnings elimination
Disaggregation of Revenue [Line Items]
Net sales	$ (11.0)	$ (5.8)	$ (36.6)	$ (16.9)

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