Revenue Recognition (Disclosures related to the adoption of ASC 606 on January 1, 2018) - Narrative (Details)	12 Months Ended
Dec. 31, 2017 obligation
Revenue Recognition and Deferred Revenue [Abstract]
Number of performance obligations	2
Number of performance obligations related to trade execution	1
Period of recognition of performance obligations	2 years
Period of customer revenue list recognized for NYSE	9 years
Period of customer revenue list recognized for NYSE area and NYSE American	5 years
Period of customer revenue list recognized for NYSE, modifications	6 years
Period of customer revenue list recognized for NYSE area and NYSE American, modifications	3 years

Revenue Recognition, Number of Performance Obligation Related to Trade Execution

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Revenue Recognition, Number of Performance Obligations

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Revenue Recognition, Period of Customer Revenue List Recognized for NYSE

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Revenue Recognition, Period of Customer Revenue List Recognized for NYSE Area and NYSE American

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Revenue Recognition, Period of Customer Revenue List Recognized for NYSE Area and NYSE American, Modifications

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Revenue Recognition, Period of Customer Revenue List Recognized for NYSE, Modifications

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Revenue Recognition, Period of Recognition of Performance Obligations

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