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Segment Information - Net Revenue From External Customers and Intercompany Revenue From Each Operating Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Total net revenue | $ 1,597.2 | $ 1,054.0 | $ 1,329.7
Intercompany net revenues | 0.0 | 0.0 | 0.0
Other revenue | 20.9 | 13.1 | 33.4
Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 695.4 | 435.3 | 687.3
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 61.0 | 34.6 | 70.1
External Customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 1,597.2 | 1,054.0 | 1,329.7
External Customer | Pari-mutuel, live and simulcast racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 502.6 | 475.1 | 407.9
External Customer | Historical racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 253.0 | 93.6 | 81.6
External Customer | Racing event-related services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 76.7 | 24.7 | 128.4
External Customer | Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 656.8 | 392.6 | 585.8
External Customer | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 108.1 | 68.0 | 126.0
Live and Historical Racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 430.6 | 188.8 | 292.2
TwinSpires |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 433.1 | 416.0 | 296.7
Gaming Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 698.4 | 437.8 | 689.7
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 1,597.2 | 1,054.0 | 1,329.7
Operating Segments | External Customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 1,536.2 | 1,019.4 | 1,259.6
Operating Segments | External Customer | Pari-mutuel, live and simulcast racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 472.9 | 456.9 | 368.9
Operating Segments | External Customer | Historical racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 253.0 | 93.6 | 81.6
Operating Segments | External Customer | Racing event-related services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 69.7 | 24.4 | 122.7
Operating Segments | External Customer | Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 656.8 | 392.6 | 585.8
Operating Segments | External Customer | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 83.8 | 51.9 | 100.6
Operating Segments | Live and Historical Racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 409.1 | 169.6 | 276.7
Intercompany net revenues | 21.5 | 19.2 | 15.5
Operating Segments | Live and Historical Racing | External Customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 409.1 | 169.6 | 276.7
Operating Segments | Live and Historical Racing | External Customer | Pari-mutuel, live and simulcast racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 64.0 | 46.5 | 61.1
Operating Segments | Live and Historical Racing | External Customer | Historical racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 253.0 | 93.6 | 81.6
Operating Segments | Live and Historical Racing | External Customer | Racing event-related services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 68.5 | 21.0 | 118.6
Operating Segments | Live and Historical Racing | External Customer | Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Operating Segments | Live and Historical Racing | External Customer | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 23.6 | 8.5 | 15.4
Operating Segments | Live and Historical Racing | Churchill Downs Racetrack |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 128.1 | 63.3 | 187.6
Intercompany net revenues | 19.9 | 17.8 | 15.2
Operating Segments | Live and Historical Racing | Derby City Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 154.3 | 79.5 | 86.6
Operating Segments | Live and Historical Racing | Oak Grove |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 100.7 | 16.6 | 0.0
Operating Segments | Live and Historical Racing | Turfway Park |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 8.1 | 7.1 | 2.5
Intercompany net revenues | 1.6 | 1.4 | 0.3
Operating Segments | Live and Historical Racing | Newport |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 17.9 | 3.1 | 0.0
Operating Segments | TwinSpires |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 431.7 | 414.5 | 295.6
Operating Segments | TwinSpires | External Customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 431.7 | 414.5 | 295.6
Operating Segments | TwinSpires | External Customer | Pari-mutuel, live and simulcast racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 380.7 | 387.5 | 277.1
Operating Segments | TwinSpires | External Customer | Historical racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Operating Segments | TwinSpires | External Customer | Racing event-related services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Operating Segments | TwinSpires | External Customer | Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 34.8 | 11.3 | 5.7
Operating Segments | TwinSpires | External Customer | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 16.2 | 15.7 | 12.8
Operating Segments | TwinSpires | Horse Racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 396.9 | 403.2 | 289.9
Operating Segments | TwinSpires | Sports and Casino |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 34.8 | 11.3 | 5.7
Operating Segments | Gaming Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 695.4 | 435.3 | 687.3
Intercompany net revenues | 3.0 | 2.5 | 2.4
Operating Segments | Gaming Segment | External Customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 695.4 | 435.3 | 687.3
Operating Segments | Gaming Segment | External Customer | Pari-mutuel, live and simulcast racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 28.2 | 22.9 | 30.7
Operating Segments | Gaming Segment | External Customer | Historical racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
Operating Segments | Gaming Segment | External Customer | Racing event-related services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 1.2 | 3.4 | 4.1
Operating Segments | Gaming Segment | External Customer | Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 622.0 | 381.3 | 580.1
Operating Segments | Gaming Segment | External Customer | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 44.0 | 27.7 | 72.4
Operating Segments | Gaming Segment | Fair Grounds and VSI |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 133.6 | 97.6 | 123.0
Intercompany net revenues | 2.6 | 2.3 | 1.9
Operating Segments | Gaming Segment | Presque Isle |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 119.6 | 73.1 | 137.5
Intercompany net revenues | 0.3 | 0.2 | 0.4
Operating Segments | Gaming Segment | Ocean Downs |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 100.6 | 60.2 | 85.9
Operating Segments | Gaming Segment | Calder |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 100.0 | 51.8 | 99.8
Intercompany net revenues | 0.1 | 0.0 | 0.1
Operating Segments | Gaming Segment | Oxford Casino |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 99.8 | 44.9 | 101.7
Operating Segments | Gaming Segment | Riverwalk Casino |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 61.2 | 46.3 | 56.1
Operating Segments | Gaming Segment | Harlow’s Casino |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 56.1 | 40.7 | 54.0
Operating Segments | Gaming Segment | Lady Luck Nemacolin |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 24.5 | 20.7 | 29.3
Operating Segments | TwinSpires |  |  |
Segment Reporting Information [Line Items] |  |  |
Intercompany net revenues | 1.4 | 1.5 | 1.1
All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 61.0 | 34.6 | 70.1
Intercompany net revenues | 12.9 | 11.8 | 11.3
All Other | External Customer |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 61.0 | 34.6 | 70.1
All Other | External Customer | Pari-mutuel, live and simulcast racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 29.7 | 18.2 | 39.0
All Other | External Customer | Historical racing |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
All Other | External Customer | Racing event-related services |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 7.0 | 0.3 | 5.7
All Other | External Customer | Gaming |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 0.0 | 0.0 | 0.0
All Other | External Customer | All Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenue | 24.3 | 16.1 | 25.4
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Intercompany net revenues | $ (38.8) | $ (35.0) | $ (30.3)

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