UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Net premiums earned	$ 1,486,595	$ 1,398,339	$ 2,923,013	$ 2,759,722
Net investment income	262,631	296,505	527,873	576,768
Realized investment gains (losses):
Net realized gains (losses) on investments sold	15,800	17,632	57,568	(11,360)
Other-than-temporary impairments on investments	(16,168)	(40,088)	(34,733)	(73,808)
Other-than-temporary impairments on investments transferred to (from) other comprehensive income	(12,025)	12,912	(14,425)	9,187
Total net realized (losses) on investments	(12,393)	(9,544)	8,410	(75,981)
Net realized and unrealized (losses) on derivative instruments	(4,300)	(10,950)	(3,598)	(7,383)
Income (loss) from investment fund affiliates	3,097	10,250	22,505	37,400
Fee income and other	11,109	10,582	20,968	19,514
Total revenues	1,746,739	1,695,182	3,499,171	3,310,040
Expenses:
Net losses and loss expenses incurred	826,355	823,584	1,680,420	2,032,449
Claims and policy benefits	131,150	137,416	252,457	270,647
Acquisition costs	218,937	215,099	443,088	403,589
Operating expenses	299,052	266,142	581,463	527,134
Foreign exchange (gains) losses	(17,976)	(8,498)	(5,258)	1,016
Interest expense	57,360	55,099	96,658	109,246
Total expenses	1,514,878	1,488,842	3,048,828	3,344,081
Income (loss) before income tax and income (loss) from operating affiliates	231,861	206,340	450,343	(34,041)
Income (loss) from operating affiliates	22,561	46,251	38,814	59,887
Provision (benefit) for income tax	29,812	24,826	51,362	(7,971)
Net income (loss)	224,610	227,765	437,795	33,817
Non-controlling interests	(3,454)	(2,102)	(40,011)	(35,438)
Net income (loss) attributable to XL Group plc and ordinary shareholders	$ 221,156	$ 225,663	$ 397,784	$ (1,621)
Weighted average ordinary shares and ordinary share equivalents outstanding - basic (in shares)	309,765	309,184	312,442	310,325
Weighted average ordinary shares and ordinary share equivalents outstanding - diluted (in shares)	312,435	341,989	315,010	310,325
Earnings (loss) per ordinary share and ordinary share equivalent - basic (in dollars per share)	$ 0.71	$ 0.73	$ 1.27	$ (0.01)
Earnings (loss) per ordinary share and ordinary share equivalent - diluted (in dollars per share)	$ 0.71	$ 0.69	$ 1.26	$ (0.01)