| **Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions** |        | 12 Months Ended |           |        |        |
|----------------------------------------------------------------------------------------|--------|-----------------|-----------|--------|--------|
||
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Indefinite-lived intangible assets (excluding goodwill)                                |   | $ 2,418.4       | $ 2,391.8 |   |   |   |   |
| Amortization of definite-lived intangible assets                                       |   | 7.2             | 4.7       | $ 4.8  |   |   |   |
| Gaming | Terre Haute Property                                                          |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Gaming rights intangible asset                                                         |   |            | 5.0       |   |   |   |   |
| Trademarks                                                                             |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Indefinite-lived intangible assets (excluding goodwill)                                |   | 121.5           | 125.7     |   |   |   |   |
| Gaming rights                                                                          |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Indefinite-lived intangible assets (excluding goodwill)                                |   | 2,225.8         | 2,256.5   |   |   |   |   |
| P2E Transaction                                                                        |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Other intangible assets                                                                |   |            |      |   |   | $ 1,941.5 |   |
| P2E Transaction | Trademarks                                                           |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Other intangible assets                                                                |   |            |      |   |   | $ 75.9 |   |
| P2E Transaction | Gaming Rights                                                        |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Other intangible assets                                                                |   |            | 1,900.0   |   |   |   |   |
| Ellis Park                                                                             |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Gaming rights intangible asset                                                         |   |            | 47.4      |   |   |   |   |
| Ellis Park | Trademarks                                                                |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Gaming rights intangible asset                                                         |   |            | $ 3.6     |   |   |   |   |
| Other intangible assets                                                                |   |            |      |   |   |   | $ 3.6 |
| Ellis Park | Gaming Rights                                                             |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Other intangible assets                                                                |   |            |      |   |   |   | $ 47.4 |
| Exacta Systems                                                                         |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Other intangible assets                                                                |   | $ 54.3          |      |   | $ 54.3 |   |   |
| Chasers Poker Room                                                                     |   |            |      |   |   |   |   |
| **Finite-Lived Intangible Assets [Line Items]**                                        |   |            |      |   |   |   |   |
| Gaming rights intangible asset                                                         | $ 82.2 |            |      |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2
+ Details**Name:**us-gaap_AmortizationOfIntangibleAssets**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of intangible assets, excluding goodwill, acquired at the acquisition date.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1
+ Details**Name:**us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5
+ Details**Name:**us-gaap_FiniteLivedIntangibleAssetsLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2
+ Details**Name:**us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition.
+ References
No definition available.
+ Details**Name:**us-gaap_IndefinitelivedIntangibleAssetsAcquired**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=chdn_GamingSegmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_AssetAcquisitionAxis=chdn_TerreHautePropertyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ContractualRightsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=chdn_P2ETransactionMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=chdn_GamingRightsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=chdn_EllisParkMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=chdn_ExactaSystemsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=chdn_ChasersPokerRoomMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |