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Segments - Assets by Segment (Detail) - USD ($)
$ in Millions
Dec. 29, 2018
Dec. 30, 2017
Segment Reporting Information [Line Items]    
Assets $ 5,373.1 $ 5,249.1
Operating Segments    
Segment Reporting Information [Line Items]    
Assets 5,186.5 5,114.3
Operating Segments | Commercial & Industrial Group    
Segment Reporting Information [Line Items]    
Assets 1,087.9 1,113.9
Operating Segments | Snap-on Tools Group    
Segment Reporting Information [Line Items]    
Assets 752.7 714.3
Operating Segments | Repair Systems & Information Group    
Segment Reporting Information [Line Items]    
Assets 1,306.3 1,314.3
Operating Segments | Financial Services    
Segment Reporting Information [Line Items]    
Assets 2,039.6 1,971.8
Corporate    
Segment Reporting Information [Line Items]    
Assets 249.2 200.6
Intersegment eliminations    
Segment Reporting Information [Line Items]    
Assets $ (62.6) $ (65.8)