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Other Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]    
Amortization Expense 2015 $ 10.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
Amortization Expense 2016 10.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
Amortization Expense 2017 10.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
Amortization Expense 2018 10.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Amortization Expense 2019 10.0us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Weighted average life of intangible assets subject to amortization 20 years 20 years
Gross 216.0us-gaap_FiniteLivedIntangibleAssetsGross 216.0us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization (87.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (75.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net 129.0us-gaap_FiniteLivedIntangibleAssetsNet 141.0us-gaap_FiniteLivedIntangibleAssetsNet
Franchising rights    
Finite Lived Intangible Assets [Line Items]    
Gross 200.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
200.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
Accumulated Amortization (71.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
(61.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
Net 129.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
139.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_FranchiseRightsMember
Recipes and Menus    
Finite Lived Intangible Assets [Line Items]    
Gross 15.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_RecipesAndMenusMember
15.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_RecipesAndMenusMember
Accumulated Amortization (15.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_RecipesAndMenusMember
(13.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_RecipesAndMenusMember
Net 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_RecipesAndMenusMember
2.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_RecipesAndMenusMember
Leaseholds/other    
Finite Lived Intangible Assets [Line Items]    
Gross 0.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_LeaseholdsAndOtherMember
0.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_LeaseholdsAndOtherMember
Accumulated Amortization (0.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_LeaseholdsAndOtherMember
(0.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_LeaseholdsAndOtherMember
Net $ 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_LeaseholdsAndOtherMember
$ 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= din_LeaseholdsAndOtherMember