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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Other Intangible Assets [Abstract]  
Intangible Assets Subject to Amortization

Acquired intangible assets subject to amortization as of March 31, 2024 and December 31, 2023 were as follows:

        
Mar. 31, 2024
    
Dec. 31, 2023
  
(in millions of dollars)
  
Weighted Average
Useful Life
(Years)
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Gross
Carrying
Amount
    
Accumulated
Amortization
  
Tradenames
    
34
    
$
221.3
    
$
60.3
    
$
221.5
    
$
59.1
  
Technology
    
13
      
18.8
      
14.6
      
18.8
      
14.2
  
Patents and trademarks
    
19
      
6.4
      
6.4
      
6.4
      
6.4
  
Customer relationships
    
21
      
78.4
      
16.0
      
79.0
      
15.0
  
     
29
    
$
324.9
    
$
97.3
    
$
325.7
    
$
94.7