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Revenue Recognition - Segment Sales Disaggregated by Major Product Line (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Total Net Sales $ 3,830.2 $ 3,818.1 $ 3,852.8
China      
Disaggregation of Revenue [Line Items]      
Total Net Sales 672.8 760.0 827.4
North America      
Disaggregation of Revenue [Line Items]      
Total Net Sales 2,964.4 2,928.1 2,904.3
Rest of World      
Disaggregation of Revenue [Line Items]      
Total Net Sales 865.8 890.0 948.5
Operating Segments      
Disaggregation of Revenue [Line Items]      
Total Net Sales 3,864.6 3,868.7 3,879.8
Operating Segments | North America      
Disaggregation of Revenue [Line Items]      
Total Net Sales 2,984.2 2,950.1 2,922.9
Operating Segments | North America | Water heaters and related parts      
Disaggregation of Revenue [Line Items]      
Total Net Sales 2,460.1 2,441.7 2,456.9
Operating Segments | North America | Boilers and related parts      
Disaggregation of Revenue [Line Items]      
Total Net Sales 281.0 260.0 240.1
Operating Segments | North America | Water treatment products      
Disaggregation of Revenue [Line Items]      
Total Net Sales 243.1 248.4 225.9
Operating Segments | Rest of World      
Disaggregation of Revenue [Line Items]      
Total Net Sales 880.4 918.6 956.9
Operating Segments | Rest of World | China      
Disaggregation of Revenue [Line Items]      
Total Net Sales 689.5 791.9 835.1
Operating Segments | Rest of World | All other Rest of World      
Disaggregation of Revenue [Line Items]      
Total Net Sales 190.9 126.7 121.8
Inter-segment sales      
Disaggregation of Revenue [Line Items]      
Total Net Sales (34.4) (50.6) (27.0)
Inter-segment sales | North America      
Disaggregation of Revenue [Line Items]      
Total Net Sales (19.8) (22.0) (18.6)
Inter-segment sales | Rest of World      
Disaggregation of Revenue [Line Items]      
Total Net Sales $ (14.6) $ (28.6) $ (8.4)