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Stock-Based Compensation Plans - Additional Information - Restricted Shares and Restricted Stock Units (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 23, 2016 service_period shares | Sep. 22, 2015 service_period shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 18.9 | $ 13.8 | $ 11.9
Unrecognized compensation expense |  |  | $ 15.6 |  |
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan |  |  | 15 months |  |
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 1.3 |
Other awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) | shares |  |  | 72,529 |  |
Performance and service period under adopted ELTI Plan |  |  | 3 years |  |
Stock-based compensation expense |  |  | $ 4.4 |  |
Unrecognized compensation expense |  |  | $ 7.7 |  |
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan |  |  | 15 months |  |
Churchill Downs Incorporated 2007 Omnibus Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
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 |  |
NEOs, Grantees and certain other employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) | shares |  |  |  | 167,800 |
Unrecognized compensation expense |  |  | $ 3.0 |  |
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan |  |  | 13 months |  |
Stock-based compensation expense |  |  | $ 4.7 | $ 6.2 |
Performance-Based Awards | NEOs, Grantees and certain other employees | Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted shares awarded | shares |  |  | 56,915 |  |
Minimum | NEOs, Grantees and certain other employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting service period |  |  |  | 7 months |
Maximum | NEOs, Grantees and certain other employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting service period |  |  |  | 3 years |
February 23, 2016 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Restricted Stock Units (RSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) | shares | 24,677 |  |  |  |
Number of vesting service periods | service_period | 3 |  |  |  |
February 23, 2016 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) | shares | 29,633 |  |  |  |
Performance and service period under adopted ELTI Plan | 34 months |  |  |  |
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% |  |  |
February 23, 2016 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | RSUs, PSUs, and Other Employee Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 7.7 |  |
February 23, 2016 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | RSU and PSU awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense |  |  | 4.3 |  |
February 23, 2016 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Other awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense |  |  | 4.9 |  |
February 23, 2016 | Performance-Based Awards | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | 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 |  |  |  |
September 22, 2015 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Restricted Stock Units (RSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) | shares |  | 22,142 |  |  |
Requisite service periods | service_period |  | 2 |  |  |
September 22, 2015 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | Performance Share Units (PSU) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of units received by NEOs and Grantees under adopted ELTI Plan (in shares) | shares |  | 27,282 |  |  |
Performance and service period under adopted ELTI Plan |  | 30 months |  |  |
September 22, 2015 | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) | RSU and PSU awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | 3.8 | $ 0.9 |
Unrecognized compensation expense |  |  | $ 2.6 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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