Significant Accounting Policies and Basis of Presentation - Customer-related Liabilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) liability loyaltyProgram	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, number of liabilities | liability	3
Number of loyalty programs | loyaltyProgram	1
Revenue recognized	$ 3.6	$ 0.9
Online sports betting and related iGaming market access
Disaggregation of Revenue [Line Items]
Customer-related liabilities	40.3		$ 42.6
Loyalty Credit Obligation
Disaggregation of Revenue [Line Items]
Customer-related liabilities, current	$ 32.9		29.7
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	$ 141.8		$ 151.4