Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2013
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company was party to transactions with entities that are affiliated with Wilbur L. Ross, Jr., a director of the Company, and funds under his control, which in the aggregate owned approximately 8.2% of the common shares of AGL as of December 31, 2013, 10.2% as of December 31, 2012 and 10.9% as of December 31, 2011. In addition, the Company retains Wellington Management Company, LLP, as investment manager for a portion of the Company's investment portfolio. Wellington Company LLP owned approximately 6.6% of the common shares of AGL as of December 31, 2013, 8.6% as of December 31, 2012 and 9.6% as of December 31, 2011. The net expenses from transactions with these related parties were approximately $2.5 million in 2013, with no individual related party expense item exceeding $1.9 million, $3.4 million in 2012, with no individual related party expense item exceeding $2.0 million, and $2.6 million in 2011, with no related party expense item exceeding $1.9 million. As of December 31, 2013, 2012 and 2011 there were no significant amounts payable to or amounts receivable from related parties. In addition, please refer to Note 19, Shareholders' Equity, for a description of the transaction under which the Company purchased common shares from funds associated with WL Ross & Co. LLC and its affiliates and from Mr. Ross.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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