| **Investments in and Advances to Unconsolidated Affiliates - Additional Information (Details) - USD ($) $ in Millions** | 6 Months Ended |        |
|-------------------------------------------------------------------------------------------------------------------------|----------------|--------|
||
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Distributions from unconsolidated affiliates                                                                            | $ 91.7         | $ 77.9 |   |
| Rivers Des Plaines                                                                                                      |           |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Equity method investment, ownership percentage                                                                          | 61.30%         |   | 61.30% |
| Miami Valley Gaming LLC                                                                                                 |           |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Equity method investment, ownership percentage                                                                          | 50.00%         |   | 50.00% |
| Equity method investment, amount                                                                                        | $ 113.3        |   | $ 114.4 |
| Distributions from unconsolidated affiliates                                                                            | 23.5           | 16.5   |   |
| Midwest Gaming Holdings, LLC                                                                                            |           |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Equity method investment, difference between carrying amount and underlying equity                                      | 832.5          |   |   |
| Equity method investment, amount                                                                                        | 531.4          |   | $ 544.9 |
| Distributions from unconsolidated affiliates                                                                            | $ 68.2         | $ 61.3 |   |
| High Plaines | Rivers Des Plaines                                                                                       |           |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Equity method investment, ownership percentage                                                                          | 36.00%         |   |   |
| Casino Investors | Rivers Des Plaines                                                                                   |           |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Equity method investment, ownership percentage                                                                          | 2.70%          |   |   |
| Delaware North Companies Gaming & Entertainment Inc. | Miami Valley Gaming LLC                                      |           |   |   |
| **Investments in and Advances to Affiliates [Line Items]**                                                              |           |   |   |
| Equity method investment, ownership percentage                                                                          | 50.00%         |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                  |
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| X                                                                                                                                      |
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| X                                                                                                                                                                    |
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