Accounting Standards Adopted and Newly Issued Accounting Standards Not Yet Adopted (Policies)	9 Months Ended
Sep. 30, 2020
Accounting Changes and Error Corrections [Abstract]
Fiscal Period	The Company’s fiscal quarters end on the Sunday closest to the last day of each calendar quarter. For convenience, the fiscal quarters of each year are referred to as ending on March 31, June 30, September 30 and December 31. The first fiscal quarter of 2020 began on December 30, 2019 and ended on March 29, 2020; the second and third fiscal quarters of 2020 ended on June 28, 2020 and September 27, 2020, respectively. The first fiscal quarter of 2019 began on December 31, 2018 and ended on March 31, 2019; the second and third fiscal quarters of 2019 ended on June 30, 2019 and September 29, 2019, respectively.
Risks and Uncertainties	Risks and UncertaintiesThe Company was subject to risks and uncertainties as a result of the rapidly spreading outbreak of a novel strain of coronavirus, designated “COVID-19.” The extent of the continued impact of the COVID-19 pandemic on the Company's business is highly uncertain and difficult to predict, as measures taken in response to and the effect of the pandemic has varied and continues to vary by state and municipalities within states. Assessments of the success of measures taken and the timing of any further restrictions, or lifting of such restrictions, is rapidly evolving. The Company first began to experience impacts from COVID-19 in March 2020, as federal, state and local governments began to react to the public health crisis by encouraging “social distancing” and requiring, in varying degrees, restaurant dine-in limitations and other restrictions that largely limited the restaurants of the Company's franchisees and its company-operated restaurants to take-out and delivery sales. Many international restaurants were temporarily closed for at least a part of March as well as a result of government restrictions put in place in various countries. Subsequent to imposition, government-imposed dine-in restrictions were relaxed in many of the locations in which the Company operates, although dining room capacity continues to be limited to 50% or less at most restaurants. Additionally, economies worldwide also have been negatively impacted by the COVID-19 pandemic, which possibly could cause a domestic and/or global economic recession.
Accounting Standards Adopted in the Current Fiscal Year and Not Yet Adopted	Accounting Standards Adopted in the Current Fiscal Year In February 2016, the Financial Accounting Standards Board (“FASB”) issued new guidance on the measurement of current expected credit losses (“CECL”) on financial instruments. The new guidance has replaced the incurred loss methodology of recognizing credit losses on financial instruments with a methodology that estimates the expected credit loss on financial instruments and reflects the net amount expected to be collected on the financial instrument. The Company adopted this change in accounting principle as of the first day of the first fiscal quarter of 2020 using the modified retrospective method. Accordingly, financial information for periods prior to the date of initial application has not been adjusted. Upon adoption of the new CECL guidance, the Company recognized an increase to its allowance for credit losses of $0.7 million. The Company recognized an adjustment to retained earnings upon adoption of $0.5 million, net of tax of $0.2 million. Additional new accounting guidance became effective for the Company as of the beginning of fiscal 2020 that the Company reviewed and concluded was either not applicable to its operations or had no material effect on its consolidated financial statements in the current or future fiscal years. Newly Issued Accounting Standards Not Yet Adopted In December 2019, the FASB issued new guidance intended to simplify the accounting for income taxes, change the accounting for certain income tax transactions, and make other minor changes. The Company will be required to adopt the new guidance beginning with its first fiscal quarter of 2021; early adoption in any interim period after issuance of the new guidance is permitted. The Company is currently assessing the impact this guidance will have on its consolidated financial statements but does not expect this standard to have a material effect on its financial statements. The Company does not intend to adopt the standard early. In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying current U.S. GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (LIBOR) or by another reference rate expected to be discontinued. The guidance can be adopted immediately and is applicable to contracts entered into on or before December 31, 2022. We are currently evaluating our contracts that reference LIBOR and the potential effects of adopting this new guidance. The Company reviewed all other newly issued accounting pronouncements and concluded that they either are not applicable to the Company's operations or that no material effect is expected on the Company's financial statements when adoption is required in the future.

Accounting Standards Adopted and Newly Issued Accounting Standards Not Yet Adopted (Policies)

9 Months Ended

Sep. 30, 2020

Accounting Changes and Error Corrections [Abstract]

The Company’s fiscal quarters end on the Sunday closest to the last day of each calendar quarter. For convenience, the fiscal quarters of each year are referred to as ending on March 31, June 30, September 30 and December 31. The first fiscal quarter of 2020 began on December 30, 2019 and ended on March 29, 2020; the second and third fiscal quarters of 2020 ended on June 28, 2020 and September 27, 2020, respectively. The first fiscal quarter of 2019 began on December 31, 2018 and ended on March 31, 2019; the second and third fiscal quarters of 2019 ended on June 30, 2019 and September 29, 2019, respectively.

Risks and Uncertainties

Risks and UncertaintiesThe Company was subject to risks and uncertainties as a result of the rapidly spreading outbreak of a novel strain of coronavirus, designated “COVID-19.” The extent of the continued impact of the COVID-19 pandemic on the Company's business is highly uncertain and difficult to predict, as measures taken in response to and the effect of the pandemic has varied and continues to vary by state and municipalities within states. Assessments of the success of measures taken and the timing of any further restrictions, or lifting of such restrictions, is rapidly evolving. The Company first began to experience impacts from COVID-19 in March 2020, as federal, state and local governments began to react to the public health crisis by encouraging “social distancing” and requiring, in varying degrees, restaurant dine-in limitations and other restrictions that largely limited the restaurants of the Company's franchisees and its company-operated restaurants to take-out and delivery sales. Many international restaurants were temporarily closed for at least a part of March as well as a result of government restrictions put in place in various countries. Subsequent to imposition, government-imposed dine-in restrictions were relaxed in many of the locations in which the Company operates, although dining room capacity continues to be limited to 50% or less at most restaurants. Additionally, economies worldwide also have been negatively impacted by the COVID-19 pandemic, which possibly could cause a domestic and/or global economic recession.

Accounting Standards Adopted in the Current Fiscal Year and Not Yet Adopted

Accounting Standards Adopted in the Current Fiscal Year

In February 2016, the Financial Accounting Standards Board (“FASB”) issued new guidance on the measurement of current expected credit losses (“CECL”) on financial instruments. The new guidance has replaced the incurred loss methodology of recognizing credit losses on financial instruments with a methodology that estimates the expected credit loss on financial instruments and reflects the net amount expected to be collected on the financial instrument. The Company adopted this change in accounting principle as of the first day of the first fiscal quarter of 2020 using the modified retrospective method. Accordingly, financial information for periods prior to the date of initial application has not been adjusted.

Upon adoption of the new CECL guidance, the Company recognized an increase to its allowance for credit losses of $0.7 million. The Company recognized an adjustment to retained earnings upon adoption of $0.5 million, net of tax of $0.2 million.

Additional new accounting guidance became effective for the Company as of the beginning of fiscal 2020 that the Company reviewed and concluded was either not applicable to its operations or had no material effect on its consolidated financial statements in the current or future fiscal years.

Newly Issued Accounting Standards Not Yet Adopted

In December 2019, the FASB issued new guidance intended to simplify the accounting for income taxes, change the accounting for certain income tax transactions, and make other minor changes. The Company will be required to adopt the new guidance beginning with its first fiscal quarter of 2021; early adoption in any interim period after issuance of the new guidance is permitted. The Company is currently assessing the impact this guidance will have on its consolidated financial statements but does not expect this standard to have a material effect on its financial statements. The Company does not intend to adopt the standard early.

In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying current U.S. GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (LIBOR) or by another reference rate expected to be discontinued. The guidance can be adopted immediately and is applicable to contracts entered into on or before December 31, 2022. We are currently evaluating our contracts that reference LIBOR and the potential effects of adopting this new guidance.

The Company reviewed all other newly issued accounting pronouncements and concluded that they either are not applicable to the Company's operations or that no material effect is expected on the Company's financial statements when adoption is required in the future.