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Significant Accounting Policies - Revenue Disaggregation and Customer-Related Liabilities (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) type agreement | Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items] |  |
Contract with customer, liability, number of liability types | type | 3 |
Online sports betting and iGaming market access |  |
Disaggregation of Revenue [Line Items] |  |
Customer-related liabilities | $ 54.9 | $ 52.7
Number of operator agreements containing ordinary shares and warrants | agreement | 2 |
Loyalty Credit Obligation |  |
Disaggregation of Revenue [Line Items] |  |
Customer-related liabilities | $ 36.7 | 35.8
Customer-related liabilities, term | 6 months |
Advance Payments on Goods and Services Yet to Be Provided and Unpaid Wagers |  |
Disaggregation of Revenue [Line Items] |  |
Customer-related liabilities | $ 54.4 | 47.1
Customer-related liabilities, long-term |  | $ 0.5

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