Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared by the Company in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. Accordingly, the unaudited consolidated financial statements do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and should be read in conjunction with the Company’s audited consolidated financial statements and related notes thereto for the year ended December 31, 2013. The accompanying unaudited consolidated financial statements reflect all adjustments that are, in the opinion of the Company’s management, necessary for a fair presentation of results for the interim periods presented. These adjustments are of a normal recurring nature. Preparing financial statements requires management to make estimates and assumptions that affect the amounts that are reported in the consolidated financial statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may be different from these estimates. The results of operations for the six months and three months ended June 30, 2014 are not necessarily indicative of the results to be expected for any future period or the full fiscal year. The accompanying unaudited consolidated financial statements include the accounts of the Company and its wholly-owned and controlled subsidiaries. All intercompany balances and transactions between the Company and its wholly-owned and controlled subsidiaries have been eliminated in consolidation. As discussed in Note 3, the Company completed the acquisition of Singapore Mercantile Exchange Pte. Ltd. (“SMX”) during the six months ended June 30, 2014 and has included the financial results of SMX in its consolidated financial statements effective from the acquisition date. As discussed in Note 13, the Company completed the IPO of Euronext on June 24, 2014 and has included the financial results of this company through this date in discontinued operations in the consolidated financial statements. For those consolidated subsidiaries in which the Company’s ownership is less than 100% and for which the Company has control over the assets and liabilities and the management of the entity, the outside stockholders’ interests are shown as non-controlling interests.
Segment Information	Segment Information The Company previously operated as a single reportable business segment as of December 31, 2013. As of March 31, 2014, the Company reported two business segments, the ICE segment and the Euronext segment, which was reflective of how the Company's chief operating decision maker reviewed and operated the Company's business. Following the IPO and de-consolidation of Euronext in June 2014, the Company reverted to one operating segment, the ICE segment, as this is reflective of how the Company's chief operating decision maker reviews and operates the Company's business as of June 30, 2014.

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared by the Company in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission regarding interim financial reporting. Accordingly, the unaudited consolidated financial statements do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and should be read in conjunction with the Company’s audited consolidated financial statements and related notes thereto for the year ended December 31, 2013. The accompanying unaudited consolidated financial statements reflect all adjustments that are, in the opinion of the Company’s management, necessary for a fair presentation of results for the interim periods presented. These adjustments are of a normal recurring nature.

Preparing financial statements requires management to make estimates and assumptions that affect the amounts that are reported in the consolidated financial statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may be different from these estimates. The results of operations for the six months and three months ended June 30, 2014 are not necessarily indicative of the results to be expected for any future period or the full fiscal year.

The accompanying unaudited consolidated financial statements include the accounts of the Company and its wholly-owned and controlled subsidiaries. All intercompany balances and transactions between the Company and its wholly-owned and controlled subsidiaries have been eliminated in consolidation. As discussed in Note 3, the Company completed the acquisition of Singapore Mercantile Exchange Pte. Ltd. (“SMX”) during the six months ended June 30, 2014 and has included the financial results of SMX in its consolidated financial statements effective from the acquisition date. As discussed in Note 13, the Company completed the IPO of Euronext on June 24, 2014 and has included the financial results of this company through this date in discontinued operations in the consolidated financial statements.

For those consolidated subsidiaries in which the Company’s ownership is less than 100% and for which the Company has control over the assets and liabilities and the management of the entity, the outside stockholders’ interests are shown as non-controlling interests.