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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

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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

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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-Topic 350
-SubTopic 20
-Section 45
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