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Benefit Plans (Tables)
 3 Months Ended
Apr. 03, 2022
Benefit Plans [Abstract]  
Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost

  
Pension Benefits
  
   
Three Months Ended
  
(millions of dollars)
  
Apr. 3,
2022
    
Apr. 4,
2021
  
             
Service cost
  
$
1.8
    
$
2.0
  
Interest cost
    
2.4
      
2.0
  
Expected return on plan assets
    
(5.7
)
    
(5.4
)
Amortization:
                
Prior service cost
    
0.1
      
0.1
  
Recognized net actuarial loss
    
1.5
      
3.4
  
Net periodic benefit cost
  
$
0.1
    
$
2.1
  

 
Other Benefits
  
   
Three Months Ended
  
(millions of dollars)
  
Apr. 3,
2022
    
Apr. 4,
2021
  
             
Service cost
  
$
—
    
$
—
  
Interest cost
    
—
      
—
  
Amortization:
                
Recognized net actuarial (gain)
    
(0.1
)
    
(0.2
)
Net periodic benefit cost
  
$
(0.1
)
  
$
(0.2
)