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Segment Information - Schedule of Net Revenue from External Customers (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | $ 265.4 | $ 189.3
Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 21.4 | 2.3
Online Wagering |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 63.4 | 63.6
Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 170.1 | 112.5
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 265.4 | 189.3
Operating Segments | Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 21.0 | 2.0
Operating Segments | Online Wagering |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 63.1 | 63.2
Operating Segments | Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 168.8 | 111.5
Segment Reconciling Items | All Other |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 12.5 | 12.6
Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 168.8 | 111.5
Other |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 12.5 | 12.6
External Customer |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 265.4 | 189.3
External Customer | Operating Segments | Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 21.0 | 2.0
External Customer | Operating Segments | Online Wagering |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 63.1 | 63.2
External Customer | Operating Segments | Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 168.8 | 111.5
External Customer | Operating Segments | Total Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 252.9 | 176.7
External Customer | Segment Reconciling Items | All Other |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 12.5 | 12.6
External Customer | Pari-mutuel, live and simulcast racing |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 81.6 | 80.8
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 1.4 | 1.3
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Online Wagering |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 60.5 | 61.0
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 12.2 | 10.6
External Customer | Pari-mutuel, live and simulcast racing | Operating Segments | Total Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 74.1 | 72.9
External Customer | Pari-mutuel, live and simulcast racing | Segment Reconciling Items | All Other |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 7.5 | 7.9
External Customer | Pari-mutuel, historical racing |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 17.7 | 0.0
External Customer | Pari-mutuel, historical racing | Operating Segments | Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 17.7 | 0.0
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 | 17.7 | 0.0
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 | 1.5 | 1.4
External Customer | Racing event-related services | Operating Segments | Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 0.0 | 0.0
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 | 1.5 | 1.4
External Customer | Racing event-related services | Operating Segments | Total Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 1.5 | 1.4
External Customer | Racing event-related services | Segment Reconciling Items | All Other |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 0.0 | 0.0
External Customer | Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 146.7 | 93.9
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 | 0.1 | 0.0
External Customer | Gaming | Operating Segments | Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 146.6 | 93.9
External Customer | Gaming | Operating Segments | Total Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 146.7 | 93.9
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 | 17.9 | 13.2
External Customer | Other | Operating Segments | Churchill Downs |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 1.9 | 0.7
External Customer | Other | Operating Segments | Online Wagering |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 2.5 | 2.2
External Customer | Other | Operating Segments | Gaming |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 8.5 | 5.6
External Customer | Other | Operating Segments | Total Segments |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | 12.9 | 8.5
External Customer | Other | Segment Reconciling Items | All Other |  |
Segment Reporting Information [Line Items] |  |
Net revenue from external customers | $ 5.0 | $ 4.7

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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