Significant Accounting Policies - Customer-Related Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Online Sports Betting and iGaming Market Access
Disaggregation of Revenue [Line Items]
Customer-related liabilities, long-term	$ 55.4	$ 52.2
Loyalty Credit Obligation
Disaggregation of Revenue [Line Items]
Customer-related liabilities, current	$ 43.4	37.6
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	$ 93.2	$ 112.0