Segment Reporting (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($) segment member	Mar. 31, 2017 USD ($) member
Segment Reporting [Abstract]
Number of operating segments \| segment	2
Revenues:
Energy futures and options contracts	$ 235.0	$ 228.0
Agricultural and metals futures and options contracts	65.0	56.0
Interest rates and other financial futures and options contracts	91.0	83.0
Cash equities and equity options	438.0	381.0
OTC and other transactions	69.0	50.0
Pricing and analytics	254.0	238.0
Exchange data	143.0	138.0
Desktops and connectivity	123.0	144.0
Listings	109.0	108.0
Other revenues	53.0	45.0
Total revenues	1,580.0	1,471.0
Transaction-based expenses	355.0	305.0
Revenues, less transaction-based expenses	1,225.0	1,166.0
Operating expenses	575.0	584.0
Operating income	650.0	582.0
Trading and Clearing Segment
Revenues:
Energy futures and options contracts	235.0	228.0
Agricultural and metals futures and options contracts	65.0	56.0
Interest rates and other financial futures and options contracts	91.0	83.0
Cash equities and equity options	438.0	381.0
OTC and other transactions	69.0	50.0
Pricing and analytics	0.0	0.0
Exchange data	0.0	0.0
Desktops and connectivity	0.0	0.0
Listings	0.0	0.0
Other revenues	53.0	45.0
Total revenues	951.0	843.0
Transaction-based expenses	355.0	305.0
Revenues, less transaction-based expenses	596.0	538.0
Operating expenses	207.0	200.0
Operating income	$ 389.0	$ 338.0
Concentration risk, percentage	10.00%	10.00%
Data and Listings Segment
Revenues:
Energy futures and options contracts	$ 0.0	$ 0.0
Agricultural and metals futures and options contracts	0.0	0.0
Interest rates and other financial futures and options contracts	0.0	0.0
Cash equities and equity options	0.0	0.0
OTC and other transactions	0.0	0.0
Pricing and analytics	254.0	238.0
Exchange data	143.0	138.0
Desktops and connectivity	123.0	144.0
Listings	109.0	108.0
Other revenues	0.0	0.0
Total revenues	629.0	628.0
Transaction-based expenses	0.0	0.0
Revenues, less transaction-based expenses	629.0	628.0
Operating expenses	368.0	384.0
Operating income	261.0	244.0
Sales Revenue, Net \| Trading and Clearing Segment
Revenues:
Total revenues	$ 104.0	$ 67.0
Number of members \| member	1	1
Concentration risk, percentage	18.00%	12.00%
Accounting Standards Update 2016-09 \| Data and Listings Segment
Revenues:
Operating expenses		$ 16.0

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Cash Equities and Equity Option

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Desktop and Connectivity

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Energy Futures and Option Contracts

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Exchange Data

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Interest Rates and Other Financial Futures and Option Contracts

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Listing fees

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Other Transactions

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Pricing and Analysis

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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