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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 29, 2014
Goodwill [Line Items]  
Beginning Balance $ 838.8
Currency translation 3.0
Ending Balance 841.8
Commercial & Industrial Group [Member]
 
Goodwill [Line Items]  
Beginning Balance 312.5
Currency translation 2.6
Ending Balance 315.1
Snap-on Tools Group [Member]
 
Goodwill [Line Items]  
Beginning Balance 12.5
Currency translation   
Ending Balance 12.5
Repair Systems & Information Group [Member]
 
Goodwill [Line Items]  
Beginning Balance 513.8
Currency translation 0.4
Ending Balance $ 514.2