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Postretirement Health Care Plans - (Tables)
9 Months Ended
Sep. 28, 2019
Postemployment Benefits [Abstract]  
Net Periodic Postretirement Health Care Cost
Snap-on’s net periodic postretirement health care cost included the following components: 
Three Months EndedNine Months Ended
(Amounts in millions)September 28, 2019September 29, 2018September 28, 2019September 29, 2018
Interest cost$0.4  $0.5  $1.4  $1.4  
Expected return on plan assets(0.1) (0.2) (0.5) (0.6) 
Amortization of unrecognized gain(0.2) (0.1) (0.6) (0.3) 
Net periodic postretirement health care cost$0.1  $0.2  $0.3  $0.5