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Revenue Recognition - Segment Sales Disaggregated by Major Product Line (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Net sales	$ 1,024.3	$ 960.8	$ 2,003.1	$ 1,927.2
Operating Segments | North America
Disaggregation of Revenue [Line Items]
Net sales	790.7	722.3	1,557.0	1,475.0
Operating Segments | Rest of World
Disaggregation of Revenue [Line Items]
Net sales	244.8	244.2	471.7	463.3
Operating Segments | Rest of World | China
Disaggregation of Revenue [Line Items]
Net sales	218.2	217.7	418.8	407.9
Operating Segments | Rest of World | All other Rest of World
Disaggregation of Revenue [Line Items]
Net sales	26.6	26.5	52.9	55.4
Operating Segments | Water heaters and related parts | North America
Disaggregation of Revenue [Line Items]
Net sales	660.2	602.6	1,308.5	1,239.9
Operating Segments | Boilers and related parts | North America
Disaggregation of Revenue [Line Items]
Net sales	67.4	61.3	126.1	119.7
Operating Segments | Water treatment products and related parts | North America
Disaggregation of Revenue [Line Items]
Net sales	63.1	58.4	122.4	115.4
Inter-segment earnings elimination
Disaggregation of Revenue [Line Items]
Net sales	$ (11.2)	$ (5.7)	$ (25.6)	$ (11.1)

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