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COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) | Apr. 18, 2014 item
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City of Providence | Pending Litigation |
Loss Contingencies |
The number of other securities exchanges a lawsuit has been filed against | 14

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- Definition The number of other securities exchanges a lawsuit has been filed against. + References No definition available. + Details
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Namespace Prefix: | cboe_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Details
Name: | us-gaap_LitigationStatusAxis=us-gaap_PendingLitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |