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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 27, 2014
Goodwill [Line Items]  
Beginning Balance $ 838.8
Currency translation (23.5)
Acquisition 13.2
Ending Balance 828.5
Commercial & Industrial Group [Member]
 
Goodwill [Line Items]  
Beginning Balance 312.5
Currency translation (21.4)
Acquisition   
Ending Balance 291.1
Snap-on Tools Group [Member]
 
Goodwill [Line Items]  
Beginning Balance 12.5
Currency translation   
Acquisition   
Ending Balance 12.5
Repair Systems & Information Group [Member]
 
Goodwill [Line Items]  
Beginning Balance 513.8
Currency translation (2.1)
Acquisition 13.2
Ending Balance $ 524.9