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Stock-Based Compensation Plans - Additional Information (Details) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 24, 2016 | Dec. 31, 2018 USD ($) service_period | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 21.1 | $ 27.1 | $ 18.9 |
Income tax benefit related to stock-based employee compensation |  | 2.7 | 5.5 | 4.9 |
Fair value of shares and units vested |  | $ 32.4 | 29.6 | 24.3 |
Award period |  | 1 year |  |  |
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |
Churchill Downs Incorporated 2016 Omnibus Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) | 1 year |  |  |  |
Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan | Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |
Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | February 23, 2016 | Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum award payout curve percentage of original performance share units awarded (as a percent) |  | 200.00% |  |  |
Percentage increase in awards if in top quartile |  | 25.00% |  |  |
Percentage decrease if in bottom quartile |  | 25.00% |  |  |
Maximum number of performance share units as percentage of original award (as a percent) |  | 250.00% |  |  |
Performance-Based Awards | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | February 23, 2016 | Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance and service period under adopted ELTI Plan |  | 3 years |  |  |
Requisite service periods | service_period |  | 3 |  |  |
Continuing Operations |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  | $ 17.7 | $ 16.0 | $ 13.3 |
Minimum | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum award payout curve percentage of original performance share units awarded (as a percent) |  |  |  |  | 0.00%
Maximum | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum award payout curve percentage of original performance share units awarded (as a percent) |  |  |  |  | 200.00%

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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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