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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2024
Benefit Plans [Abstract]  
Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost

  
Pension Benefits
  
   
Three Months Ended
  
(in millions of dollars)
  
Mar. 31,
2024
    
Apr. 2,
2023
  
Service cost
  
$
1.2
    
$
1.2
  
Interest cost
    
4.0
      
3.9
  
Expected return on plan assets
    
(5.0
)
    
(4.5
)
Amortization:
                
Recognized net actuarial loss
    
0.4
      
0.6
  
Net periodic benefit cost
  
$
0.6
    
$
1.2
  

 
Post-Retirement Benefits
  
   
Three Months Ended
  
(in millions of dollars)
  
Mar. 31,
2024
    
Apr. 2,
2023
  
Service cost
  
$
—
    
$
—
  
Interest cost
    
—
      
—
  
Amortization:
                
Recognized net actuarial (gain)
    
(0.1
)
    
(0.1
)
Net periodic benefit cost
  
$
(0.1
)
  
$
(0.1
)