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Basis Of Presentation (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 D | Jun. 30, 2012 D | Jun. 30, 2013 D | Jun. 30, 2012 D | Dec. 31, 2012
Promotional Allowance [Line Items] |  |  |  |  |
Live Racing Days | 124 | 122 | 180 | 178 |
Customer Loyalty Program Liability | $ 2.2 |  | $ 2.2 |  | $ 2.1
Promotional Allowances | 9.1 | 5.1 | 16.4 | 9.5 |
Estimated Cost Of Providing Promotional Allowances | 2.4 | 1.2 | 4.7 | 2.4 |
Racing Operations |  |  |  |  |
Promotional Allowance [Line Items] |  |  |  |  |
Promotional Allowances | 0.3 | 0.3 | 0.4 | 0.5 |
Online Operations |  |  |  |  |
Promotional Allowance [Line Items] |  |  |  |  |
Promotional Allowances | 3.7 | 2.3 | 6.1 | 4.0 |
Gaming Operations |  |  |  |  |
Promotional Allowance [Line Items] |  |  |  |  |
Promotional Allowances | $ 5.1 | $ 2.5 | $ 9.8 | $ 5.0 |

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- Definition Customer Loyalty Program Liability + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Estimated Cost Of Providing Promotional Allowances + References No definition available. + Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Live Racing Days + References No definition available. + Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:integerItemType
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- Details
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Namespace Prefix: | chdn_
Data Type: | xbrli:stringItemType
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- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6472957&loc=d3e51325-107943 + Details
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