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Pension Plans - (Tables)
6 Months Ended
Jul. 03, 2021
Retirement Benefits [Abstract]  
Schedule of Net Periodic Pension Cost
Snap-on’s net periodic pension cost included the following components: 
Three Months EndedSix Months Ended
(Amounts in millions)July 3, 2021June 27, 2020July 3, 2021June 27, 2020
Service cost$6.9 $6.6 $14.4 $13.5 
Interest cost10.5 12.3 21.1 24.4 
Expected return on plan assets(23.5)(23.7)(47.1)(47.4)
Amortization of unrecognized loss9.1 8.8 18.2 17.2 
Net periodic pension cost$3.0 $4.0 $6.6 $7.7