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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue Recognition [Abstract]  
Segment Sales Disaggregated by Major Product Line
Years ending December 31 (dollars in millions)
 
2019
   
2018
   
2017
 
North America
   
     
     
 
Water heaters and related parts
  $
1,742.6
    $
1,757.0
    $
1,663.0
 
Boilers and related parts
   
199.5
     
200.4
     
183.3
 
Water treatment products
(1)
    
141.4
     
87.3
     
58.5
 
                         
Total North America
   
2,083.5
     
2,044.7
     
1,904.8
 
Rest of World
   
     
     
 
China
  $
827.2
    $
1,070.4
    $
1,029.4
 
All other Rest of World
   
108.6
     
103.2
     
86.9
 
                         
Total Rest of World
   
935.8
     
1,173.6
     
1,116.3
 
Inter-segment sales
   
(26.6
 )    
(30.4
 )    
(24.4
 )
                         
Total Net Sales
  $
2,992.7
    $
3,187.9
    $
2,996.7
 
                         
(1)
 Includes the results of Water-Right and Hague Quality Water International (Hague) from the date of acquisition of April 8, 2019 and September 5, 2017, respectively.