| **Other Balance Sheet Items - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions** | Jun. 30, 2023 | Dec. 31, 2022 |
|---------------------------------------------------------------------------------------------------|---------------|---------------|
| **Accounts, Notes, Loans and Financing Receivable [Line Items]**                                  |          |          |
| Accounts receivable                                                                               | $ 85.0        | $ 87.2        |
| Allowance for credit losses                                                                       | (5.5)         | (5.7)         |
| Accounts receivable, net                                                                          | 79.5          | 81.5          |
| Trade receivables                                                                                 |          |          |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]**                                  |          |          |
| Accounts receivable                                                                               | 33.8          | 12.5          |
| Simulcast and online wagering receivables                                                         |          |          |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]**                                  |          |          |
| Accounts receivable                                                                               | 34.6          | 54.1          |
| Other receivables                                                                                 |          |          |
| **Accounts, Notes, Loans and Financing Receivable [Line Items]**                                  |          |          |
| Accounts receivable                                                                               | $ 16.6        | $ 20.6        |

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| - Definition
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.
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| - Definition
Amount of allowance for credit loss on accounts receivable, classified as current.
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| X                                                                                                                                                      |
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| X                                                                                                                                            |
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