Acres of land

No definition available.

Name:	chdn_Acres
Namespace Prefix:	chdn_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Equity Method Investments, Contingent Payable

+ References

No definition available.

+ Details

Name:	chdn_EquityMethodInvestmentsContingentPayable
Namespace Prefix:	chdn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financial Performance Period To Determine Potential Contingent Consideration Payment

+ References

No definition available.

+ Details

Name:	chdn_FinancialPerformancePeriodToDeterminePotentialContingentConsiderationPayment
Namespace Prefix:	chdn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Note Payable, Term

+ References

No definition available.

+ Details

Name:	chdn_NotePayableTerm
Namespace Prefix:	chdn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Lottery Terminals

+ References

No definition available.

+ Details

Name:	chdn_NumberOfLotteryTerminals
Namespace Prefix:	chdn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Race Track, Length

+ References

No definition available.

+ Details

Name:	chdn_RaceTrackLength
Namespace Prefix:	chdn_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	instant

- Definition

Square footage of Casino

+ References

No definition available.

+ Details

Name:	chdn_SquareFootageOfCasino
Namespace Prefix:	chdn_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 13
-Article 5

+ Details

Name:	us-gaap_EquityMethodInvestmentDividendsOrDistributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of noncurrent liabilities reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(g))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721683-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33912-111571

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph w
-Article 1

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph g
-Subparagraph 1, 2
-Article 4

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph bb
-Article 1

+ Details

Name:	us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_InvestmentsInAndAdvancesToAffiliatesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=chdn_MiamiValleyGamingAndRacingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	chdn_EquityMethodInvestmentByFundingAxis=chdn_FundedAtClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	chdn_EquityMethodInvestmentByFundingAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investment in and Advances to Unconsolidated Affiliates (Details) $ in Millions		3 Months Ended	6 Months Ended
	Dec. 21, 2012 USD ($)	Jun. 30, 2016 USD ($) terminal	Jun. 30, 2016 USD ($) terminal	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) ft² a mi	Dec. 31, 2012 USD ($)
Investments in and Advances to Affiliates [Line Items]
Long-term debt, excluding current portion		$ 17.3	$ 17.3		$ 20.5	$ 50.0
Dividend from investment in unconsolidated affiliates			$ 8.2	$ 7.5
Miami Valley Gaming and Racing [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investment, Ownership Percentage					50.00%
Equity Method Investments	$ 60.0
Note Payable, Term	6 years
Equity Method Investments, Contingent Payable	$ 10.0
Financial Performance Period To Determine Potential Contingent Consideration Payment	7 years
Acres \| a					120
Race Track, Length \| mi					0.625
Square footage of Casino \| ft²					186,000
Number of Lottery Terminals \| terminal		1,630	1,630
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate		5.00%	5.00%
Dividend from investment in unconsolidated affiliates		$ 3.8	$ 7.8
Funded at Closing [Member] \| Miami Valley Gaming and Racing [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investments	$ 10.0
Notes Payable, Other Payables [Member] \| Miami Valley Gaming and Racing [Member]
Investments in and Advances to Affiliates [Line Items]
Equity Method Investments	$ 50.0