| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-05-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 8-K | 10-K | 10-K |
| Net revenue: | | | | | | | | |
| Total net revenue | 1,809.8 | 1,597.2 | 1,054.0 | 1,329.7 | 1,009.0 | 1,009.0 | 882.6 | 822.4 |
| Total net revenue growth | 13.3% | 51.5% | -20.7% | 31.8% | 14.3% | | 7.3% | 3.0% |
| Operating expense: | | | | | | | | |
| Operating expense | | | | | | | | |
| Selling, general and administrative expense | 164.2 | 138.5 | 114.8 | 122.0 | 90.6 | 90.6 | 83.5 | 79.4 |
| Asset impairments | 38.3 | 15.3 | 17.5 | | | | 21.7 | |
| Total operating expense | 1,488.0 | 1,312.8 | 993.8 | 1,114.0 | 820.2 | 90.6 | 736.9 | 649.9 |
| Operating income | 321.8 | 284.4 | 60.2 | 215.7 | 188.8 | 188.8 | 145.7 | 172.5 |
| Operating margin | 17.8% | 17.8% | 5.7% | 16.2% | 18.7% | 18.7% | 16.5% | 21.0% |
| |
| Other income (expense): | | | | | | | | |
| Interest expense, net | -147.3 | -84.7 | -80.0 | -70.9 | -40.1 | -40.1 | -49.3 | -43.7 |
| Equity in income of unconsolidated affiliates | 152.7 | 143.2 | 27.7 | 50.6 | 29.6 | 29.6 | 25.5 | 17.4 |
| Gain on Calder land sale | 274.6 | | | | | | | -23.7 |
| Miscellaneous, net | 7.0 | 0.7 | 0.1 | 1.0 | 0.7 | | 1.3 | 1.2 |
| Total other income (expense) | 287.0 | 59.2 | -52.2 | -19.3 | 45.1 | 45.1 | -43.2 | -25.1 |
| Income from continuing operations before provision for income taxes | 608.8 | 343.6 | 8.0 | 196.4 | 233.9 | | 102.5 | 147.4 |
| Income tax (provision) benefit | -169.4 | -94.5 | -5.3 | 56.8 | -51.3 | -51.3 | 19.9 | -50.7 |
| Income from continued operations, net of tax | 439.4 | 249.1 | 13.3 | 139.6 | 182.6 | | | |
| Net income (loss) | 439.4 | 249.1 | -82.1 | 137.2 | 352.8 | | | |
| Net loss attributable to noncontrolling interest | | | 0.2 | 0.3 | | | | |
| Net income (loss) and comprehensive income (loss) attributable to Churchill Downs Incorporated | 439.4 | 249.1 | -81.9 | 137.5 | 352.8 | 352.8 | 140.5 | 108.1 |
| |
| Net income (loss) per common share data - basic: | | | | | | | | |
| Continuing operations (in dollars per share) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Discontinued operations (in dollars per share) | | | 0.0 | 0.0 | 0.0 | | | |
| |
| Net income (loss) per common share - basic (in dollars per share) | $11.58 | $6.45 | ($2.07) | $3.43 | $8.54 | $8.54 | $2.97 | $2.17 |
| |
| Net income (loss) per common share data - diluted: | | | | | | | | |
| Continuing operations (in dollars per share) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Discontinued operations (in dollars per share) | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Net income (loss) per common share - diluted (in dollars per share) | $11.42 | $6.35 | ($2.08) | $3.38 | $8.48 | $8.48 | $2.92 | $2.14 |
| |
| Weighted average shares outstanding: | | | | | | | | |
| Basic (in shares) | 37.9 | 38.6 | 39.6 | 40.1 | 41.3 | 41.6 | 47.2 | 49.3 |
| Diluted (in shares) | 38.5 | 39.2 | 40.1 | 40.6 | 41.6 | 41.6 | 48.0 | 50.5 |
| Gain on Calder land sale | 274.6 | | | | | | | -23.7 |