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Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Acquisition of Cinnober For further discussion of our acquisition of Cinnober, see “Acquisition of Cinnober,” of Note 3, “Acquisitions and Divestiture,” to the consolidated financial statements. Offer for Oslo Børs VPS In February 2019, we, through our indirect wholly-owned subsidiary Nasdaq AB, made a public offer, or the Offer, to acquire all of the issued shares of Oslo Børs VPS Holding ASA, or Oslo Børs VPS, at NOK 152 per share plus interest payments at a rate of 6% per annum on the Offer price, pro-rated per day from January 29, 2019 until the conditions to the Offer have been fulfilled or waived. The Offer price values the entire issued share capital of Oslo Børs VPS at NOK 6,537 million, or approximately $770 million. Oslo Børs VPS’ board of directors has unanimously recommended that its shareholders accept the Offer. The acceptance period will be open from February 4, 2019 to March 4, 2019 and is subject to extension or re-opening. The Offer is subject to the fulfillment or waiver of certain customary conditions, including but not limited to acceptances from shareholders holding 90% or more of the shares of Oslo Børs VPS, certain regulatory clearances, limited confirmatory due diligence and completion of the Offer by December 31, 2019. Agreement to Sell BWise In February 2019, we entered into an agreement with SAI Global to sell BWise, our internal audit, regulatory compliance management, and operational risk management software that comprises our governance, risk and compliance product offering. Subject to regulatory approvals, works council and other representative body consultations and notifications in applicable jurisdictions, as well as other customary closing conditions, the transaction is expected to close in the first half of 2019. BWise is part of our Corporate Solutions business within our Corporate Services segment.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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