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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Gains on cash flow hedges:        
Interest expense $ 12.0 $ 13.0 $ 25.6 $ 25.7
Income tax expense 55.8 67.3 113.4 129.9
Net earnings attributable to Snap-on Incorporated 178.7 153.2 341.7 294.8
Amortization of net unrecognized losses and prior service credits        
Total reclassifications for the period, net of tax (5.7) (4.0) (11.0) (7.9)
Cash Flow Hedges        
Amortization of net unrecognized losses and prior service credits        
Total reclassifications for the period, net of tax 0.3 0.4 0.8 0.7
Amortization of net unrecognized losses and prior service credits        
Amortization of net unrecognized losses and prior service credits        
Amortization of net unrecognized losses and prior service credits (8.0) (6.7) (15.6) (13.2)
Defined Benefit Pension and Postretirement Plans        
Amortization of net unrecognized losses and prior service credits        
Income tax benefit 2.0 2.3 3.8 4.6
Total reclassifications for the period, net of tax (6.0) (4.4) (11.8) (8.6)
Reclassification out of AOCI | Cash Flow Hedges        
Gains on cash flow hedges:        
Income tax expense 0.0 0.0 0.0 0.0
Net earnings attributable to Snap-on Incorporated 0.3 0.4 0.8 0.7
Reclassification out of AOCI | Treasury locks | Cash Flow Hedges        
Gains on cash flow hedges:        
Interest expense $ 0.3 $ 0.4 $ 0.8 $ 0.7