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Benefit Plans (Tables)
3 Months Ended
Apr. 05, 2026
Benefit Plans [Abstract]  
Net Periodic Benefit Cost
Components of Net Periodic Benefit Cost
 
 Pension Benefits
 Three Months Ended
Apr. 5, Mar. 30,
(in millions of dollars)2026 2025
Service cost $0.9  $1.0 
Interest cost  4.0   4.2 
Expected return on plan assets  (5.9  (5.5
Amortization:   
Recognized net actuarial loss  0.1   0.2 
Net periodic benefit cost $(0.9 $(0.1
 Postretirement Benefits
 Three Months Ended
Apr. 5,Mar. 30,
(in millions of dollars)2026 2025
Service cost $-  $- 
Interest cost  -   - 
Amortization:     
Recognized net actuarial gain (0.1  (0.1
Net periodic benefit cost $(0.1 $(0.1