| **Segment Information - Reconciliation of Comprehensive Income to Adjusted EBITDA by Segment (Details) - USD ($) $ in Millions** | 3 Months Ended | 6 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Net income and comprehensive income                                                                                              | $ 143.0        | $ 339.3        | $ 298.7 | $ 381.4 |
| Depreciation and amortization                                                                                                    | 41.8           | 26.1           | 79.7 | 51.2 |
| Interest expense, net                                                                                                            | 65.2           | 35.1           | 129.9 | 56.4 |
| Income tax provision                                                                                                             | 56.2           | 140.6          | 109.4 | 157.1 |
| EBITDA                                                                                                                           | 306.2          | 541.1          | 617.7 | 646.1 |
| Stock-based compensation expense                                                                                                 | 8.1            | 7.4            | 16.7 | 14.4 |
| Pre-opening expense                                                                                                              | 3.2            | 2.6            | 6.4 | 4.7 |
| Arlington exit costs                                                                                                             | 5.9            | 1.8            | 9.3 | 4.3 |
| Other expenses, net                                                                                                              | 6.6            | 0.0            | 6.9 | 0.0 |
| Transaction expense, net                                                                                                         | 0.5            | 1.2            | 0.3 | 6.2 |
| Asset impairments                                                                                                                | 24.5           | 0.0            | 24.5 | 4.9 |
| Interest, depreciation and amortization expense related to equity investments                                                    | 9.9            | 10.5           | 19.7 | 21.6 |
| Changes in fair value of Rivers Des Plaines' interest rate swaps                                                                 | 0.0            | (2.2)          | 0.0 | (12.6) |
| Other charges and recoveries, net                                                                                                | (1.2)          | 0.0            | (0.9) | 1.0 |
| Gain on sale of assets                                                                                                           | 0.0            | (274.6)        | (114.0) | (274.6) |
| Total adjustments to EBITDA                                                                                                      | 57.5           | (249.9)        | (31.1) | (226.4) |
| Adjusted EBITDA                                                                                                                  | 363.7          | 291.2          | 586.6 | 419.7 |
| Net revenue                                                                                                                      | 768.5          | 582.5          | 1,328.0 | 946.6 |
| Operating Segments                                                                                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 380.8          | 304.6          | 621.8 | 447.7 |
| All Other                                                                                                                        |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | (17.1)         | (13.4)         | (35.2) | (28.0) |
| Net revenue                                                                                                                      | 0.2            | 0.5            | 0.5 | 1.0 |
| Live and Historical                                                                                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 223.5          | 163.9          | 305.6 | 191.8 |
| Net revenue                                                                                                                      | 408.0          | 275.9          | 623.8 | 363.1 |
| Taxes and purses                                                                                                                 | (85.4)         | (59.6)         | (141.9) | (86.4) |
| Marketing and advertising                                                                                                        | (12.1)         | (6.4)          | (20.3) | (9.3) |
| Salaries and benefits                                                                                                            | (30.3)         | (18.9)         | (52.1) | (29.8) |
| Content expense                                                                                                                  | (2.0)          | (1.0)          | (3.5) | (1.6) |
| Selling, general and administrative expense                                                                                      | (7.3)          | (3.0)          | (16.0) | (6.3) |
| Other operating expense                                                                                                          | (47.6)         | (23.2)         | (84.6) | (38.0) |
| Other income                                                                                                                     | 0.2            | 0.1            | 0.2 | 0.1 |
| Live and Historical | Operating Segments                                                                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 223.5          | 163.9          | 305.6 | 191.8 |
| Net revenue                                                                                                                      | 385.0          | 260.9          | 599.4 | 346.9 |
| TwinSpires                                                                                                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 33.9           | 33.9           | 63.3 | 58.0 |
| Net revenue                                                                                                                      | 139.1          | 138.5          | 235.5 | 239.9 |
| Taxes and purses                                                                                                                 | (7.0)          | (7.2)          | (12.0) | (14.7) |
| Marketing and advertising                                                                                                        | (5.3)          | (5.0)          | (6.7) | (10.1) |
| Salaries and benefits                                                                                                            | (7.5)          | (6.9)          | (13.7) | (13.6) |
| Content expense                                                                                                                  | (68.7)         | (68.1)         | (111.7) | (111.2) |
| Selling, general and administrative expense                                                                                      | (2.7)          | (2.6)          | (5.1) | (5.2) |
| Other operating expense                                                                                                          | (14.0)         | (14.8)         | (24.0) | (27.1) |
| Other income                                                                                                                     | 0.0            | 0.0            | 1.0 | 0.0 |
| TwinSpires | Operating Segments                                                                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 33.9           | 33.9           | 63.3 | 58.0 |
| Net revenue                                                                                                                      | 137.4          | 136.8          | 232.2 | 237.1 |
| Gaming                                                                                                                           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 123.4          | 106.8          | 252.9 | 197.9 |
| Net revenue                                                                                                                      | 247.9          | 184.5          | 499.5 | 363.7 |
| Taxes and purses                                                                                                                 | (81.7)         | (68.2)         | (165.3) | (135.5) |
| Marketing and advertising                                                                                                        | (9.0)          | (3.7)          | (17.6) | (7.2) |
| Salaries and benefits                                                                                                            | (39.5)         | (23.5)         | (74.0) | (47.4) |
| Content expense                                                                                                                  | (2.7)          | (2.2)          | (4.5) | (3.7) |
| Selling, general and administrative expense                                                                                      | (10.3)         | (6.7)          | (22.5) | (13.3) |
| Other operating expense                                                                                                          | (30.0)         | (22.2)         | (60.0) | (42.2) |
| Other income                                                                                                                     | 48.7           | 48.8           | 97.3 | 83.5 |
| Gaming | Operating Segments                                                                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Adjusted EBITDA                                                                                                                  | 123.4          | 106.8          | 252.9 | 197.9 |
| Net revenue                                                                                                                      | 245.9          | 184.3          | 495.9 | 361.6 |
| Rivers Des Plaines                                                                                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Rivers Des Plaines' legal reserves and transaction costs                                                                         | 0.0            | 0.2            | 0.0 | 0.5 |
| Other Segments [Member]                                                                                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                                                                   |           |           |   |   |
| Legal reserve                                                                                                                    | $ 0.0          | $ 3.2          | $ 0.0 | $ 3.2 |

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Fair Value of Interest Rate Swaps, non-cash
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Other income (expense) that is excluding of Adjusted EBITDA items
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The total amount of salaries and benefits items that are associated with the entity's normal operation.
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The total amount of tax and purse expense items that are associated with the entity's normal operation.
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| - Definition
Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.
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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.
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| - Definition
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.
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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.
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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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The net amount of operating interest income (expense).
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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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Expenditures associated with opening new locations which are noncapital in nature and expensed as incurred.
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