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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Adjustment to retained earnings $ (4,257.6) $ (3,772.3)   $ (3,770.5)
Revenue, performance obligation, description of timing These contracts are generally for 12 months but can be for a term up to 60 months.      
Contractual obligation $ 221.0      
Contract with customer, liability 63.8     49.4
Contract with customer, liability, revenue recognized $ 37.4      
Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Increase in inventory obsolescence reserve       2.4
Adjustment to retained earnings       2.4
Software Subscriptions, Extended Warranties and Other Subscription Agreements        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue, performance obligation, description of timing For performance obligations related to software subscriptions, extended warranties and other subscription agreements, Snap-on transfers control and recognizes revenue over time on a ratable basis using a time-based output method. The performance obligations are typically satisfied as services are rendered on a straight-line basis over the contract term, which is generally for 12 months but can be for a term up to 60 months.      
Franchise Fee Revenue        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue from contract with customer $ 16.2 $ 15.2 $ 13.9  
Ship-and-Bill Type Contracts        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue, performance obligation, description of timing For ship-and-bill type contracts with customers, the contract states the final terms of the sale, including the description, quantity, and price of each product or service purchased. Payment terms are typically due upon delivery or up to 30 days after delivery but can range up to 120 days after delivery.      
Subscription Contracts        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Revenue, performance obligation, description of timing For subscription contracts, payment terms are in advance or in arrears of services on a monthly, quarterly or annual basis over the contract term, which is generally for 12 months but can be for a term up to 60 months depending on the product or service.      
Transferred at Point in Time | Sales Revenue Net | Product Concentration Risk        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Concentration risk, percentage 90.00%      
Maximum        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Capitalized contract cost, amortization period 12 months      
Topic 606 Adjustments | Accounting Standards Update 2014-09        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Adjustment to retained earnings       $ 1.8