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Revenue Recognition - Segment Sales Disaggregated by Major Product Line (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Net sales $ 3,818.1 $ 3,852.8 $ 3,753.9
China      
Disaggregation of Revenue [Line Items]      
Net sales 760.0 827.4 826.6
North America      
Disaggregation of Revenue [Line Items]      
Net sales 2,928.1 2,904.3 2,792.4
Rest of World      
Disaggregation of Revenue [Line Items]      
Net sales 890.0 948.5 961.5
Operating Segments      
Disaggregation of Revenue [Line Items]      
Net sales 3,868.7 3,879.8 3,784.9
Operating Segments | North America      
Disaggregation of Revenue [Line Items]      
Net sales 2,950.1 2,922.9 2,819.1
Operating Segments | North America | Water heaters and related parts      
Disaggregation of Revenue [Line Items]      
Net sales 2,441.7 2,456.9 2,325.1
Operating Segments | North America | Boilers and related parts      
Disaggregation of Revenue [Line Items]      
Net sales 260.0 240.1 272.0
Operating Segments | North America | Water treatment products      
Disaggregation of Revenue [Line Items]      
Net sales 248.4 225.9 222.0
Operating Segments | Rest of World      
Disaggregation of Revenue [Line Items]      
Net sales 918.6 956.9 965.8
Operating Segments | Rest of World | China      
Disaggregation of Revenue [Line Items]      
Net sales 791.9 835.1 839.1
Operating Segments | Rest of World | All other Rest of World      
Disaggregation of Revenue [Line Items]      
Net sales 126.7 121.8 126.7
Inter-segment sales      
Disaggregation of Revenue [Line Items]      
Net sales (50.6) (27.0) (31.0)
Inter-segment sales | North America      
Disaggregation of Revenue [Line Items]      
Net sales (22.0) (18.6) (26.7)
Inter-segment sales | Rest of World      
Disaggregation of Revenue [Line Items]      
Net sales $ (28.6) $ (8.4) $ (4.3)