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Revenue Recognition - Schedule of Segment Sales Disaggregated by Major Product Line (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Total Net Sales $ 942.5 $ 902.6 $ 2,917.7 $ 2,905.7
North America        
Disaggregation of Revenue [Line Items]        
Total Net Sales 737.7 697.6 2,255.1 2,243.6
Rest of World        
Disaggregation of Revenue [Line Items]        
Total Net Sales 204.8 205.0 662.6 662.1
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total Net Sales 950.7 913.6 2,945.2 2,942.3
Operating Segments | North America        
Disaggregation of Revenue [Line Items]        
Total Net Sales 742.8 703.3 2,270.5 2,260.3
Operating Segments | Rest of World        
Disaggregation of Revenue [Line Items]        
Total Net Sales 207.9 210.3 674.7 682.0
Operating Segments | Rest of World | China        
Disaggregation of Revenue [Line Items]        
Total Net Sales 151.7 174.6 531.2 593.4
Operating Segments | Rest of World | All other Rest of World        
Disaggregation of Revenue [Line Items]        
Total Net Sales 56.2 35.7 143.5 88.6
Operating Segments | Water heaters and related parts | North America        
Disaggregation of Revenue [Line Items]        
Total Net Sales 604.9 568.9 1,873.9 1,877.4
Operating Segments | Boilers and related parts | North America        
Disaggregation of Revenue [Line Items]        
Total Net Sales 78.0 71.1 213.6 197.2
Operating Segments | Water treatment products and related parts | North America        
Disaggregation of Revenue [Line Items]        
Total Net Sales 59.9 63.3 183.0 185.7
Inter-segment sales        
Disaggregation of Revenue [Line Items]        
Total Net Sales (8.2) (11.0) (27.5) (36.6)
Inter-segment sales | North America        
Disaggregation of Revenue [Line Items]        
Total Net Sales (5.1) (5.7) (15.4) (16.7)
Inter-segment sales | Rest of World        
Disaggregation of Revenue [Line Items]        
Total Net Sales $ (3.1) $ (5.3) $ (12.1) $ (19.9)