Consolidated Statements of Operations (USD $) In Thousands, except Per Share data	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Revenues
Net earned premiums	$ 1,186,705	$ 930,429	$ 261,398
Net investment income	354,703	259,222	162,558
Net realized investment gains (losses):
Other-than-temporary impairment losses	(44,672)	(74,022)	(71,268)
Less: portion of other-than-temporary impairment loss recognized in other comprehensive income	(17,292)	(28,176)
Other net realized investment gains (losses)	25,386	13,184	1,467
Net realized investment gains (losses)	(1,994)	(32,662)	(69,801)
Net change in fair value of credit derivatives:
Realized gains and other settlements	153,495	163,558	117,589
Net unrealized gains (losses)	(155,106)	(337,810)	38,034
Net change in fair value of credit derivatives	(1,611)	(174,252)	155,623
Fair value gain (loss) on committed capital securities	9,195	(122,940)	42,746
Net change in financial guaranty variable interest entities	(273,652)	(1,156)
Other income	40,107	58,518	664
Total Revenues	1,313,453	917,159	553,188
Expenses
Loss and loss adjustment expenses	412,161	393,800	265,762
Amortization of deferred acquisition costs	34,057	53,899	61,249
Assured Guaranty Municipal Holdings Inc. acquisition-related expenses	6,772	92,239
Interest expense	99,621	62,783	23,283
Goodwill and settlement of pre-existing relationship		23,341
Other operating expenses	211,536	174,165	90,563
Total expenses	764,147	800,227	440,857
Income (loss) before income taxes	549,306	116,932	112,331
Provision (benefit) for income taxes
Current	(25,151)	217,253	332
Deferred	80,750	(185,143)	43,116
Total provision (benefit) for income taxes	55,599	32,110	43,448
Net income (loss)	493,707	84,822	68,883
Less: Noncontrolling interest of variable interest entities		(1,156)
Net income (loss) attributable to Assured Guaranty Ltd.	$ 493,707	$ 85,978	$ 68,883
Earnings per share:
Basic (in dollars per share)	$ 2.68	$ 0.68	$ 0.78
Diluted (in dollars per share)	$ 2.61	$ 0.66	$ 0.77
Dividends per share	$ 0.18	$ 0.18	$ 0.18