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Revenue Recognition (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Schedule of Net Sales Disaggregated by Segment and Major Product Line
The following table disaggregates the Company’s net sales by segment. As described above, the Company’s North America segment sales are further disaggregated by major product line. In addition, the Company’s Rest of World segment sales are disaggregated by China and all other Rest of World:
(dollars in millions)Three Months Ended
September 30,		Nine Months Ended
September 30,
2025202420252024
North America
Water heaters and related parts$604.9 $568.9 $1,873.9 $1,877.4 
Boilers and related parts78.0 71.1 213.6 197.2 
Water treatment products and related parts59.9 63.3 183.0 185.7 
Total North America742.8 703.3 2,270.5 2,260.3 
Rest of World
China$151.7 $174.6 $531.2 $593.4 
All other Rest of World56.2 35.7 143.5 88.6 
Total Rest of World207.9 210.3 674.7 682.0 
Inter-segment sales(8.2)(11.0)(27.5)(36.6)
Total Net Sales$942.5 $902.6 $2,917.7 $2,905.7