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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 22, 2023
Mar. 31, 2024
Dec. 31, 2023
Business Acquisition [Line Items]      
Goodwill   $ 900.2 $ 899.9
Operating Segments | Live and Historical      
Business Acquisition [Line Items]      
Goodwill   376.3 376.2
Operating Segments | TwinSpires      
Business Acquisition [Line Items]      
Goodwill   233.6 $ 233.4
Exacta Systems      
Business Acquisition [Line Items]      
Total consideration $ 248.2    
Cash payment 241.3    
Deferred payments $ 6.9    
Deferred payment term 2 years    
Deferred payment liability   4.9  
Goodwill   177.4  
Exacta Systems | Operating Segments | Live and Historical      
Business Acquisition [Line Items]      
Goodwill additions   96.0  
Exacta Systems | Operating Segments | TwinSpires      
Business Acquisition [Line Items]      
Goodwill additions   $ 81.4