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Leases - Future Minimum Lease Payments, Lessor Operating Leases, and Lease Guarantees (Details) $ in Millions | 9 Months Ended
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Sep. 26, 2021 USD ($) restaurant lease | Sep. 27, 2020 USD ($)
Leases |  |
sublease income | $ 9.0 | $ 7.6
Number of domestic leases for which the Company is contingently liable | lease | 71 |
Estimated maximum amount of undiscounted payments in the event of nonpayment by primary lessees | $ 12.1 |
United Kingdom franchise-owned restaurants |  |
Leases |  |
Number of units leased and subleased | restaurant | 410 |
Initial lease terms on franchised sites | 15 years |

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
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