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Closure and Impairment Charges | 9 Months Ended
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Sep. 30, 2025
Restructuring Charges [Abstract] |
Closure and Impairment Charges | Closure and Impairment Charges Closure and impairment charges for the three and nine months ended September 30, 2025 and 2024 were as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
|  | (In millions)
Closure charges |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 4.3 |  |  | $ | 1.4 |
Other asset impairment charges |  | 0.0 |  |  | — |  |  | 3.3 |  |  | — |
Total closure and impairment charges |  | $ | 0.6 |  |  | $ | 0.4 |  |  | $ | 7.6 |  |  | $ | 1.4 |
The closure charges for the three and nine months ended September 30, 2025 were primarily related to the acquisition and closure of certain IHOP restaurants in March 2025 and the establishment of or revisions to existing closure reserves for restaurants closed prior to December 31, 2024. The closure charges for the three and nine months ended September 30, 2024 were related to the establishment of or revisions to existing closure reserves for restaurants closed prior to December 31, 2023. The other asset impairment charges for the nine months ended September 30, 2025 was primarily attributable to the strategic realignment of the IHOP Cincinnati market resulting in the acquisition and closure of certain IHOP restaurants in March 2025.

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- Definition Description of impairment of long-lived assets, goodwill impairment as well as closure charges. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables. + References No definition available. + Details
Name: | din_ImpairmentAndClosureChargesDisclosureTextBlock
Namespace Prefix: | din_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringChargesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration