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Summary of Significant Accounting Policies (Details 3)
$ in Millions
 12 Months Ended 18 Months Ended
Dec. 31, 2019
USD ($)
Years
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]        
Deferred Tax Assets, Net of Valuation Allowance, Current $ 447.0 $ 195.0   $ 195.0
Foreign Currency [Abstract]        
Foreign currency translation adjustment 221.0      
Direct Marketing Costs [Abstract]        
Advertising Expense $ 73.0 96.0 $ 179.0  
Impairment or Disposal of Property, Plant and Equipment [Abstract]        
Number of consecutive years of operating losses used as primary indicator of potential impairment for our semi-annual impairment testing of restaurant assets | Years 2      
Goodwill and Intangible Assets [Abstract]        
Goodwill Written Off Related To Sale Of Business Unit Years From Acquisition | Years 2      
Fair Value Goodwill Written Off Related To Sale Of Business Unit Minimum Years Refranchised | Years 2      
Costs associated with PH U.S. Acceleration Agreement $ 25.0 25.0 39.0  
Minimum [Member] | Buildings and improvements        
Property, Plant and Equipment [Line Items]        
Estimated useful life used in the calculation of the depreciation and amortization on a straight-line basis (in years) 5 years      
Minimum [Member] | Machinery and equipment        
Property, Plant and Equipment [Line Items]        
Estimated useful life used in the calculation of the depreciation and amortization on a straight-line basis (in years) 3 years      
Maximum [Member] | Buildings and improvements        
Property, Plant and Equipment [Line Items]        
Estimated useful life used in the calculation of the depreciation and amortization on a straight-line basis (in years) 25 years      
Maximum [Member] | Machinery and equipment        
Property, Plant and Equipment [Line Items]        
Estimated useful life used in the calculation of the depreciation and amortization on a straight-line basis (in years) 20 years      
Pizza Hut Global Division [Member] | Franchise and property expenses [Member]        
Goodwill and Intangible Assets [Abstract]        
Costs associated with PH U.S. Acceleration Agreement   $ 12.5 $ 25.0 $ 37.5