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HRE Trust Fund Proceeds (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jul. 22, 2013
Jul. 18, 2013
HRE Trust Fund Proceeds [Line Items]      
HRE Trust Fund Proceeds 15.00%chdn_HRETrustFundProceeds    
Gross Proceeds from HRE Trust   $ 23.0chdn_GrossProceedsfromHRETrust $ 7.9chdn_GrossProceedsfromHRETrust
Other Income [Member]      
HRE Trust Fund Proceeds [Line Items]      
Gross Proceeds from HRE Trust     4.2chdn_GrossProceedsfromHRETrust
/ chdn_HRETrustAxis
= us-gaap_OtherIncomeMember
Purses [Member]      
HRE Trust Fund Proceeds [Line Items]      
Gross Proceeds from HRE Trust     $ 3.6chdn_GrossProceedsfromHRETrust
/ chdn_HRETrustAxis
= chdn_PursesMember