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Pension Plans - (Tables)
9 Months Ended
Sep. 28, 2019
Retirement Benefits [Abstract]  
Net Periodic Pension Cost
Snap-on’s net periodic pension cost included the following components: 
Three Months EndedNine Months Ended
(Amounts in millions)September 28, 2019September 29, 2018September 28, 2019September 29, 2018
Service cost$5.9  $6.3  $17.7  $18.9  
Interest cost14.1  13.2  42.3  39.6  
Expected return on plan assets(22.8) (22.6) (68.3) (66.5) 
Amortization of unrecognized loss6.3  8.2  18.8  24.6  
Amortization of prior service credit(0.2) (0.3) (0.6) (0.9) 
Net periodic pension cost$3.3  $4.8  $9.9  $15.7