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Significant Accounting Policies and Basis of Presentation - Customer-related Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Disaggregation of Revenue [Line Items]          
Revenue recognized $ 1.1 $ 0.7 $ 5.3 $ 2.4  
Online sports betting and related iGaming market access          
Disaggregation of Revenue [Line Items]          
Customer-related liabilities 41.4   41.4   $ 41.9
Loyalty Credit Obligation          
Disaggregation of Revenue [Line Items]          
Customer-related liabilities, current 26.9   $ 26.9   33.1
Contract with customer, term     6 months    
Advance Payments on Goods and Services Yet to Be Provided and Unpaid Wagers          
Disaggregation of Revenue [Line Items]          
Customer-related liabilities $ 132.3   $ 132.3   $ 192.6