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Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Maximum annual contribution per employee, percent | 50.00%chdn_DefinedContributionPlanEmployerMatchingContributionAdditionalPercentageOrMatch |  |
Employers maximum additional match, percentage | 2.00%chdn_DefinedContributionPlanEmployersMaximumAdditionalMatchPercentage |  |
Employers matching contribution, annual vesting percentage | 4.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage |  |
Defined Contribution Plan, Cost Recognized | $ 2.5 us-gaap_DefinedContributionPlanCostRecognized | $ 2.3 us-gaap_DefinedContributionPlanCostRecognized | $ 1.8 us-gaap_DefinedContributionPlanCostRecognized
Company's cash contribution to deferred compensation plans | 0.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | 0.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | 0.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Noncontributory Defined Benefit Multi-Employer Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retirement plan expense | $ 0.7 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = chdn_NoncontributoryDefinedBenefitMultiEmployerRetirementPlanMember | $ 0.7 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = chdn_NoncontributoryDefinedBenefitMultiEmployerRetirementPlanMember | $ 0.6 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = chdn_NoncontributoryDefinedBenefitMultiEmployerRetirementPlanMember

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- Definition Defined Contribution Plan, Employer Matching Contribution, Additional Percentage or Match + References No definition available. + Details
Name: | chdn_DefinedContributionPlanEmployerMatchingContributionAdditionalPercentageOrMatch
Namespace Prefix: | chdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Defined Contribution Plan, Employers Maximum Additional Match, Percentage + References No definition available. + Details
Name: | chdn_DefinedContributionPlanEmployersMaximumAdditionalMatchPercentage
Namespace Prefix: | chdn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=chdn_NoncontributoryDefinedBenefitMultiEmployerRetirementPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |