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Closure and Impairment Charges (Tables) | 9 Months Ended
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Sep. 30, 2025
Restructuring Charges [Abstract] |
Schedule of Impairment and Closure 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 |

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- Definition Schedule of Impairment and Closure Charges [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | din_
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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