Note 2. Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018
Pizza Hut Global Division [Member] | Incremental Advertising [Member]
Costs associated with PH U.S. Acceleration Agreement	$ 12.5
Franchise and property expenses [Member] | Pizza Hut Global Division [Member] | Incremental Advertising [Member]
Costs associated with PH U.S. Acceleration Agreement	12.5	$ 25.0
Incremental Advertising [Member] | KFC Global Division [Member]
Costs associated with KFC U.S. Acceleration Agreement	10.0	$ 20.0	$ 20.0	$ 10.0
Accounting Standards Update 2018-02 [Member]
Reclassification from accumulated other comprehensive (income) loss to accumulated deficit for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017					$ 19.0
Accounting Standards Update 2016-16 [Member] | Other Assets [Member]
Write-off of unamortized tax consequence of certain historical intra-entity transfers of assets					$ (30.0)
2019 [Member] | Accounting Standards Update 2016-02 [Member] | Liabilities, Total [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Total Liabilities	750.0
2019 [Member] | Accounting Standards Update 2016-02 [Member] | Assets, Total [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Total Assets	$ 675.0