CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Net premiums earned	$ 1,398,339	$ 1,302,761	$ 2,759,722	$ 2,671,246
Net investment income	296,505	302,594	576,768	610,918
Realized investment gains (losses):
Net realized gains (losses) on investments sold	17,632	(3,979)	(11,360)	42
Other-than-temporary impairments on investments	(40,088)	(26,736)	(73,808)	(87,250)
Other-than-temporary impairments on investments transferred to (from) other comprehensive income	12,912	(30,671)	9,187	(10,354)
Total net realized gains (losses) on investments	(9,544)	(61,386)	(75,981)	(97,562)
Net realized and unrealized gains (losses) on derivative instruments	(10,950)	(19,896)	(7,383)	(40,376)
Income (loss) from investment fund affiliates	10,250	19,084	37,400	27,262
Fee income and other	10,582	9,535	19,514	17,953
Total revenues	1,695,182	1,552,692	3,310,040	3,189,441
Expenses:
Net losses and loss expenses incurred	823,584	747,165	2,032,449	1,639,365
Claims and policy benefits	137,416	123,375	270,647	247,118
Acquisition costs	215,099	180,560	403,589	381,697
Operating expenses	266,098	244,867	526,625	473,975
Exchange (gains) losses	(8,498)	(32,276)	1,016	(53,359)
Interest expense	55,099	49,149	109,246	98,219
Loss on termination of guarantee		23,500		23,500
Amortization of intangible assets	44	464	509	929
Total expenses	1,488,842	1,336,804	3,344,081	2,811,444
Income (loss) before income tax and income (loss) from operating affiliates	206,340	215,888	(34,041)	377,997
Provision (benefit) for income tax	24,826	42,976	(7,971)	72,812
Income (loss) from operating affiliates	46,251	21,013	59,887	32,619
Net income (loss)	227,765	193,925	33,817	337,804
Non-controlling interests	(2,102)	80	(35,438)	81
Net income (loss) attributable to XL Group plc	225,663	194,005	(1,621)	337,885
Preference share dividends		(2,194)		(34,694)
Gain on redemption of Redeemable Series C preference ordinary shares				16,616
Net income (loss) attributable to ordinary shareholders	$ 225,663	$ 191,811	$ (1,621)	$ 319,807
Weighted average ordinary shares and ordinary share equivalents outstanding – basic (in Shares)	309,184	342,056	310,325	342,049
Weighted average ordinary shares and ordinary share equivalents outstanding – diluted (in Shares)	341,989	342,878	310,325	342,781
Earnings per ordinary share and ordinary share equivalent – basic (in Dollars per share)	$ 0.73	$ 0.56	$ (0.01)	$ 0.93
Earnings per ordinary share and ordinary share equivalent – diluted (in Dollars per share)	$ 0.69	$ 0.56	$ (0.01)	$ 0.93