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Subsequent Events (Notes)	9 Months Ended
	Sep. 30, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event On October 24, 2018, the Company entered into an agreement with NeuStar, Inc. (“Neustar”) to sell the rights, economic benefits, and obligations, in all customer contracts related to its Security Services business. The transaction includes the sale of customer agreements related to Verisign’s DDoS Protection, Managed Domain Name System (“DNS”), DNS Firewall, and Recursive DNS services. As part of the transaction, the Company will continue to support the Security Services customers during the transition to Neustar, pursuant to a transition services agreement that is expected to be executed at closing. The transaction is subject to customary regulatory approval and is expected to close shortly following the receipt of such approval. The purchase price, subject to a cap of $120.0 million, consists of a payment of $50.0 million, due at the time of closing, plus an additional contingent amount, due after the first anniversary of closing. The additional contingent amount, which cannot be negative, is based upon, among other things, the successful transition of customers to Neustar during the 12-month period following closing.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

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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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