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Stock-Based Compensation Plans - Additional Information - Employee Stock Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 24, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 18.9 $ 13.8 $ 11.9
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated vesting of restricted stock (in shares)     29,218  
Compensation expense recognized     $ 1.3  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options awarded (in shares)   0 0 0
Exercised (in shares)   5,000 1,000 182,000
Total intrinsic value of options exercised   $ 0.4 $ 0.1 $ 9.6
Cash received from exercised options   $ 0.2 $ 0.1 $ 6.4
Churchill Downs Incorporated 2016 Omnibus Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 1 year      
Stock options awarded (in shares)   0    
Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)   3 years    
Stock options, contractual term (in years)   10 years    
Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan | Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)   3 years    
Employee Agreement | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercised (in shares)       180,000
Shares granted (in dollars per share)       $ 35.19
Shares exercised, minimum price (in dollars per share)       85.00
Shares exercised, maximum price (in dollars per share)       $ 91.33