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Significant Accounting Policies and Basis of Presentation - Customer-related Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disaggregation of Revenue [Line Items]          
Revenue recognized $ 3.3 $ 1.0 $ 4.2 $ 1.7  
Online sports betting and related iGaming market access          
Disaggregation of Revenue [Line Items]          
Customer-related liabilities 41.6   41.6   $ 41.9
Loyalty Credit Obligation          
Disaggregation of Revenue [Line Items]          
Customer-related liabilities, current 32.1   $ 32.1   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 $ 116.8   $ 116.8   $ 192.6