Significant Accounting Policies and Basis of Presentation - Customer-related Liabilities (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) liability loyaltyProgram	Jun. 30, 2024 USD ($)	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	$ 1.1	$ 3.3	$ 4.7	$ 4.2
Online sports betting and related iGaming market access
Disaggregation of Revenue [Line Items]
Customer-related liabilities	38.9		38.9		$ 42.6
Loyalty Credit Obligation
Disaggregation of Revenue [Line Items]
Customer-related liabilities, current	29.7		$ 29.7		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	$ 121.1		$ 121.1		$ 151.4