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Summary of Significant Accounting Policies Goodwill Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |
Impairment losses | $ 0 |
Goodwill, Impaired, Accumulated Impairment Loss | $ 14.5 | $ 113.9
GoodiwillWrittenOffRelatedToSaleOfCompanyRestaurantMonthsFromAcquisition | 24 |
Fair Value Goodwill Written Off Related To Sale Of Restaurant Minimum Months Company Operated | 24 |
Goodwill, Impaired, Accumulated Impairment Loss | $ 14.5 | $ 113.9
U.S. |  |
Goodwill [Line Items] |  |
Impairment losses | $ 0 |

X
- Definition Minimum number of months from acquisition that a Company-operated restaurant is sold, after which goodwill written off is based on the relative fair value of the business sold compared to the reporting unit (defined as each individual country). + References No definition available. + Details
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- Definition Period of allotted time within the acquisition of a restaurant and then subsequent sale that the goodwill associated with the acquisition is written off in its entirety. + References No definition available. + Details
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