Costs Incurred, Debt

No definition available.

Name:	din_CostsIncurredDebt
Namespace Prefix:	din_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Debt Instrument, Additional Interest On Fixed Rate

+ References

No definition available.

+ Details

Name:	din_DebtInstrumentAdditionalInterestOnFixedRate
Namespace Prefix:	din_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Extension Period

+ References

No definition available.

+ Details

Name:	din_DebtInstrumentExtensionPeriod
Namespace Prefix:	din_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Make-Whole Premium

+ References

No definition available.

+ Details

Name:	din_DebtInstrumentMakeWholePremium
Namespace Prefix:	din_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Number of Extensions

+ References

No definition available.

+ Details

Name:	din_DebtInstrumentNumberOfExtensions
Namespace Prefix:	din_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Service Coverage Ratio

+ References

No definition available.

+ Details

Name:	din_DebtServiceCoverageRatio
Namespace Prefix:	din_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Service Coverage Ratio, Cash Sweeping Event

+ References

No definition available.

+ Details

Name:	din_DebtServiceCoverageRatioCashSweepingEvent
Namespace Prefix:	din_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Service Coverage Ratio, Rapid Amortization Event

+ References

No definition available.

+ Details

Name:	din_DebtServiceCoverageRatioRapidAmortizationEvent
Namespace Prefix:	din_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest-Only Debt Service Coverage Ratio, Default Event

+ References

No definition available.

+ Details

Name:	din_InterestOnlyDebtServiceCoverageRatioDefaultEvent
Namespace Prefix:	din_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest-Only Debt Service Coverage Ratio, Manager Termination Event

+ References

No definition available.

+ Details

Name:	din_InterestOnlyDebtServiceCoverageRatioManagerTerminationEvent
Namespace Prefix:	din_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Line Of Credit Facility, Percentage Of Advances Drawn

+ References

No definition available.

+ Details

Name:	din_LineOfCreditFacilityPercentageOfAdvancesDrawn
Namespace Prefix:	din_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of debt issuance costs that were incurred during a noncash or partial noncash transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586

+ Details

Name:	us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromLongTermLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

Name:	us-gaap_RatioOfIndebtednessToNetCapital1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=din_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=din_Series201914.194FixedRateSeniorSecuredNotesClassA2IMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=din_TenYearUnitedStatesTreasuryBillRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=din_Series20141ClassA24.227FixedRateSeniorSecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=din_Series20191VariableFundingSeniorNotesClassA1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=din_CommercialPaperFundingRateOfConduitInvestorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=din_Series20181VariableFundingSeniorNotesClassA1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=din_Series20141VariableFundingSeniorNotesClassA1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - Additional Information (Details)	1 Months Ended		12 Months Ended
Long-Term Debt - Additional Information (Details)	Jun. 30, 2026	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) termExtensionOption Rate	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2020 Rate	Jun. 05, 2019 USD ($)
Debt Instrument [Line Items]
Rapid amortization event \| Rate			120.00%
Manager termination event \| Rate			120.00%
Interest-only debt service coverage ratio, default event \| Rate			110.00%
Debt service coverage ratio \| Rate			330.00%
Gain (loss) on extinguishment of debt			$ 0	$ (8,276,000)	$ 0
Amortization of financing costs			2,100,000	1,200,000
Debt issuance costs, gross			12,900,000
Debt issuance costs			$ 11,800,000	11,800,000
Maximum
Debt Instrument [Line Items]
Cash sweeping event \| Rate			175.00%
Letter of Credit \| Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Letter of Credit \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.15%
Letter of Credit \| Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I
Debt Instrument [Line Items]
Senior note interest rate			4.194%				4.194%
Debt instrument, face amount							$ 700,000,000
Ratio of indebtedness to net capital \| Rate			720.00%
Debt instrument, make-whole premium			$ 35,000,000
Debt issuance costs			$ 9,600,000
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I \| Forecast
Debt Instrument [Line Items]
Additional interest on fixed rate	5.00%
Debt instrument, term	10 years
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I \| Forecast \| Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.15%
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II
Debt Instrument [Line Items]
Senior note interest rate			4.723%				4.723%
Debt instrument, face amount							$ 600,000,000
Debt instrument, make-whole premium			$ 74,000,000
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II \| Forecast \| Ten Year United States Treasury Bill Rate
Debt Instrument [Line Items]
Basis spread on variable rate	2.64%
Series 2014-1 4.277% Fixed Rate Senior Notes, Class A-2
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt			$ (8,300,000)
Amortization of financing costs				1,400,000	3,400,000
Series 2014-1 4.277% Fixed Rate Senior Notes, Class A-2 \| Maximum
Debt Instrument [Line Items]
Ratio of indebtedness to net capital \| Rate			525.00%			525.00%
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020
Debt Instrument [Line Items]
Senior note interest rate			2.42%
Debt issuance costs			$ 2,200,000
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020 \| Revolving Credit Facility
Debt Instrument [Line Items]
Senior note interest rate			2.42%
Number of extensions \| termExtensionOption			2
Extension period			1 year
Line of credit facility, maximum borrowing capacity			$ 225,000,000
Line of credit facility, commitment fee percentage			0.50%
Proceeds from long-term lines of credit		$ 220,000,000.0
Debt, weighted average interest rate			2.72%
Debt issuance costs				$ 2,700,000
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020 \| Revolving Credit Facility \| Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate			2.15%
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020 \| Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			2.15%
Line of credit facility, percentage of advances drawn			60.00%
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020 \| Revolving Credit Facility \| Commercial Paper Funding Rate Of Conduit Investor
Debt Instrument [Line Items]
Basis spread on variable rate			2.15%
Line of credit facility, percentage of advances drawn			40.00%
Series 2019-1 Variable Funding Senior Notes Class A-1, variable interest rate of 2.42% at December 31, 2020 \| Letter of Credit
Debt Instrument [Line Items]
Basis spread on variable rate			2.15%
Number of extensions \| termExtensionOption			2
Extension period			1 year
Series 2018-1 Variable Funding Senior Notes Class A-1, variable interest rate of 4.93%
Debt Instrument [Line Items]
Debt instrument, term			5 years
Line of credit facility, current borrowing capacity			$ 2,200,000
Amortization of financing costs			600,000
Debt issuance costs			2,800,000
Incurred costs			200,000
Series 2018-1 Variable Funding Senior Notes Class A-1, variable interest rate of 4.93% \| Letter of Credit
Debt Instrument [Line Items]
Debt instrument, collateral amount			$ 2,800,000
Series 2014-1 Variable Funding Senior Notes Class A-1
Debt Instrument [Line Items]
Unamortized debt issuance costs					900,000
Costs incurred					1,600,000
Deferred finance costs					$ 2,500,000