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Significant Accounting Policies - Revenue Disaggregation and Customer-Related Liabilities (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 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 | $ 54.8 | $ 52.7
Number of operator agreements containing ordinary shares and warrants | agreement | 2 |
Loyalty Credit Obligation |  |
Disaggregation of Revenue [Line Items] |  |
Customer-related liabilities | $ 39.0 | 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 | $ 63.6 | 47.1
Customer-related liabilities, long-term | $ 0.5 | $ 0.5

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