|**Accrued Expenses and Other Current Liabilities (Tables)** | 3 Months Ended                                                                                                                                                                                                                                                                              
|----------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
|**Payables and Accruals [Abstract]**                        |                                                                                                                                                                                                                                                                                             
|Schedule of Accrued Expenses and Other Current Liabilities  | Accrued expenses and other current liabilities consisted of the following:(in millions)March 31, 2020December 31, 2019Account wagering deposits liability$32.7$28.9Accrued interest22.119.7Purses payable15.219.9Accrued salaries and related benefits11.229.2Other80.275.7Total$161.4$173.4
|                                                            |                                                                                                                                                                                                                                                                                             
|(in millions)                                               | March 31, 2020                                                                                                                                                                                                                                                                              
|Account wagering deposits liability                         | $                                                                                                                                                                                                                                                                                           
|Accrued interest                                            | 22.1                                                                                                                                                                                                                                                                                        
|Purses payable                                              | 15.2                                                                                                                                                                                                                                                                                        
|Accrued salaries and related benefits                       | 11.2                                                                                                                                                                                                                                                                                        
|Other                                                       | 80.2                                                                                                                                                                                                                                                                                        
|Total                                                       | $                                                                                                                                                                                                                                                                                           

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