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Pension Plans (Tables)
 6 Months Ended
Jun. 26, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Costs
The following sets forth the components of our net periodic costs associated with our noncontributory defined benefit pension plans ($ in millions):
 Three Months EndedSix Months Ended
 June 26, 2020June 28, 2019June 26, 2020June 28, 2019
U.S. Pension Benefits:
Interest cost$0.3  $0.4  $0.6  $0.8  
Expected return on plan assets(0.3) (0.3) (0.6) (0.7) 
Amortization of net loss0.1  —  0.2  —  
Net periodic pension cost$0.1  $0.1  $0.2  $0.1  
Non-U.S. Pension Benefits:
Service cost$1.1  $0.7  $2.2  $1.0  
Interest cost1.0  1.4  2.0  2.9  
Expected return on plan assets(1.4) (1.5) (2.8) (2.9) 
Amortization of net loss1.0  0.7  2.1  1.4  
Amortization of prior service cost0.1  —  0.2  —  
Net periodic pension cost$1.8  $1.3  $3.7  $2.4