Segment Information - Schedule of Net Revenue from External Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | $ 477.4 | $ 379.4 | $ 742.8 | $ 568.7 |
Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 193.1 | 164.3 | 214.5 | 166.6 |
Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 96 | 94.1 | 159.4 | 157.7 |
Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 177.8 | 108.2 | 347.9 | 220.7 |
Operating Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 477.4 | 379.4 | 742.8 | 568.7 |
Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 182.2 | 154.9 | 203.2 | 156.9 |
Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 95.6 | 93.7 | 158.7 | 156.9 |
Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 177.6 | 108.1 | 346.4 | 219.6 |
Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 22 | 22.7 | 34.5 | 35.3 |
Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 177.6 | 108.1 | 346.4 | 219.6 |
Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 22 | 22.7 | 34.5 | 35.3 |
External Customer | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 477.4 | 379.4 | 742.8 | 568.7 |
External Customer | Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 182.2 | 154.9 | 203.2 | 156.9 |
External Customer | Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 95.6 | 93.7 | 158.7 | 156.9 |
External Customer | Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 177.6 | 108.1 | 346.4 | 219.6 |
External Customer | Operating Segments | Total Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 455.4 | 356.7 | 708.3 | 533.4 |
External Customer | Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 22 | 22.7 | 34.5 | 35.3 |
External Customer | Pari-mutuel, live and simulcast racing | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 150.1 | 147.2 | 231.7 | 228 |
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 41.3 | 39.5 | 42.7 | 40.8 |
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 91.1 | 89.7 | 151.6 | 150.7 |
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 5.5 | 4.4 | 17.7 | 15 |
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Total Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 137.9 | 133.6 | 212 | 206.5 |
External Customer | Pari-mutuel, live and simulcast racing | Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 12.2 | 13.6 | 19.7 | 21.5 |
External Customer | Pari-mutuel, historical racing | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 19.9 | 0 | 37.4 | 0 |
External Customer | Pari-mutuel, historical racing | Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 19.9 | 0 | 37.4 | 0 |
External Customer | Pari-mutuel, historical racing | Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0 | 0 |
External Customer | Pari-mutuel, historical racing | Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0 | 0 |
External Customer | Pari-mutuel, historical racing | Operating Segments | Total Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 19.9 | 0 | 37.4 | 0 |
External Customer | Pari-mutuel, historical racing | Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0 | 0 |
External Customer | Racing event-related services | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 116.4 | 112.5 | 117.9 | 113.9 |
External Customer | Racing event-related services | Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 113.4 | 109.6 | 113.4 | 109.6 |
External Customer | Racing event-related services | Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0 | 0 |
External Customer | Racing event-related services | Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0.8 | 0.7 | 2.3 | 2.1 |
External Customer | Racing event-related services | Operating Segments | Total Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 114.2 | 110.3 | 115.7 | 111.7 |
External Customer | Racing event-related services | Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 2.2 | 2.2 | 2.2 | 2.2 |
External Customer | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 150.2 | 87.1 | 289.3 | 175 |
External Customer | Gaming | Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0 | 0 |
External Customer | Gaming | Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0.1 | 0 |
External Customer | Gaming | Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 150.2 | 87.1 | 289.2 | 175 |
External Customer | Gaming | Operating Segments | Total Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 150.2 | 87.1 | 289.3 | 175 |
External Customer | Gaming | Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 0 | 0 | 0 | 0 |
External Customer | Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 40.8 | 32.6 | 66.5 | 51.8 |
External Customer | Other | Operating Segments | Churchill Downs | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 7.6 | 5.8 | 9.7 | 6.5 |
External Customer | Other | Operating Segments | Online Wagering | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 4.5 | 4 | 7 | 6.2 |
External Customer | Other | Operating Segments | Gaming | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 21.1 | 15.9 | 37.2 | 27.5 |
External Customer | Other | Operating Segments | Total Segments | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | 33.2 | 25.7 | 53.9 | 40.2 |
External Customer | Other | Segment Reconciling Items | All Other | | | | |
Segment Reporting Information [Line Items] | | | | |
Net revenue from external customers | $ 7.6 | $ 6.9 | $ 12.6 | $ 11.6 |