Acquisitions	6 Months Ended
Jun. 30, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions Consistent with one of its key business strategies of supplementing its book of business through acquisitions, the Company has acquired two financial guaranty companies since January 1, 2015. CIFG Holding Inc. On July 1, 2016, AGC acquired all of the issued and outstanding capital stock of CIFG Holding Inc., the parent of financial guaranty insurer CIFG Assurance North America, Inc. ("CIFG") (the "CIFG Acquisition"), in accordance with the agreement announced on April 13, 2016. AGC transferred $450.6 million in cash to a paying agent on June 30, 2016, in anticipation of closing; the Company recorded this transaction as funds restricted for the CIFG Acquisition on the consolidated balance sheet as of June 30, 2016. AGC caused the acquisition to be consummated on July 1, 2016 and merged CIFG with and into AGC, with AGC as the surviving company, on July 5, 2016. The CIFG Acquisition added $4.4 billion of net par insured on July 1, 2016. The Company is in the process of allocating the purchase price to the assets acquired and liabilities assumed and conforming accounting policies but has not yet completed the acquisition date balance sheet. The Company intends to include this information in its third quarter 2016 Form 10-Q. Radian Asset Assurance Inc. On April 1, 2015, AGC completed the acquisition (“Radian Asset Acquisition”) of all of the issued and outstanding capital stock of financial guaranty insurer Radian Asset Assurance Inc. (“Radian Asset”) for $804.5 million. Radian Asset was merged with and into AGC, with AGC as the surviving company of the merger. The Radian Asset Acquisition added $13.6 billion to the Company's net par outstanding on April 1, 2015. Please refer to Note 2, Acquisition of Radian Asset Assurance Inc., in Part II, Item 8. “Financial Statements and Supplementary Data” of AGL’s Annual Report on Form 10-K for the year ended December 31, 2015 for additional information on the acquisition of Radian Asset, including the purchase price and the allocation of the purchase price to net assets acquired and the resulting bargain purchase gain and the gains on settlement of pre-existing relationships.

Acquisitions

6 Months Ended

Jun. 30, 2016

Consistent with one of its key business strategies of supplementing its book of business through acquisitions, the Company has acquired two financial guaranty companies since January 1, 2015.

CIFG Holding Inc.

On July 1, 2016, AGC acquired all of the issued and outstanding capital stock of CIFG Holding Inc., the parent of financial guaranty insurer CIFG Assurance North America, Inc. ("CIFG") (the "CIFG Acquisition"), in accordance with the agreement announced on April 13, 2016. AGC transferred $450.6 million in cash to a paying agent on June 30, 2016, in anticipation of closing; the Company recorded this transaction as funds restricted for the CIFG Acquisition on the consolidated balance sheet as of June 30, 2016. AGC caused the acquisition to be consummated on July 1, 2016 and merged CIFG with and into AGC, with AGC as the surviving company, on July 5, 2016. The CIFG Acquisition added $4.4 billion of net par insured on July 1, 2016.

The Company is in the process of allocating the purchase price to the assets acquired and liabilities assumed and conforming accounting policies but has not yet completed the acquisition date balance sheet. The Company intends to include this information in its third quarter 2016 Form 10-Q.

Radian Asset Assurance Inc.

On April 1, 2015, AGC completed the acquisition (“Radian Asset Acquisition”) of all of the issued and outstanding capital stock of financial guaranty insurer Radian Asset Assurance Inc. (“Radian Asset”) for $804.5 million. Radian Asset was merged with and into AGC, with AGC as the surviving company of the merger. The Radian Asset Acquisition added $13.6 billion to the Company's net par outstanding on April 1, 2015.

Please refer to Note 2, Acquisition of Radian Asset Assurance Inc., in Part II, Item 8. “Financial Statements and Supplementary Data” of AGL’s Annual Report on Form 10-K for the year ended December 31, 2015 for additional information on the acquisition of Radian Asset, including the purchase price and the allocation of the purchase price to net assets acquired and the resulting bargain purchase gain and the gains on settlement of pre-existing relationships.