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Revenue Recognition (Tables)
 6 Months Ended
Jun. 30, 2024
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
June 30,		Six Months Ended
June 30,
2024202320242023
North America
Water heaters and related parts$660.2 $602.6 $1,308.5 $1,239.9 
Boilers and related parts67.4 61.3 126.1 119.7 
Water treatment products and related parts63.1 58.4 122.4 115.4 
Total North America790.7 722.3 1,557.0 1,475.0 
Rest of World
China$218.2 $217.7 $418.8 $407.9 
All other Rest of World26.6 26.5 52.9 55.4 
Total Rest of World244.8 244.2 471.7 463.3 
Inter-segment sales(11.2)(5.7)(25.6)(11.1)
Total Net Sales$1,024.3 $960.8 $2,003.1 $1,927.2