UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Net premiums earned	$ 1,548,040	$ 1,453,326	$ 4,471,053	$ 4,213,048
Net investment income	239,480	290,106	767,353	866,874
Realized investment gains (losses):
Net realized gains (losses) on investments sold	7,136	4,461	64,704	(6,899)
Other-than-temporary impairments on investments	(10,295)	(67,513)	(45,028)	(141,321)
Other-than-temporary impairments on investments transferred to (from) other comprehensive income	(2,334)	698	(16,759)	9,885
Total net realized gains (losses) on investments	(5,493)	(62,354)	2,917	(138,335)
Net realized & unrealized (gains) losses on derivative instruments	6,254	(26,916)	2,656	(34,299)
Income (loss) from investment fund affiliates	16,050	(7,123)	38,555	30,277
Fee income and other	13,153	10,980	34,121	30,494
Total revenues	1,817,484	1,658,019	5,316,655	4,968,059
Expenses:
Net losses and loss expenses incurred	894,076	988,059	2,574,496	3,020,508
Claims and policy benefits	119,439	139,549	371,896	410,196
Acquisition costs	236,347	207,553	679,435	611,142
Operating expenses	305,746	247,815	887,209	774,949
Foreign exchange (gains) losses	18,690	(39,425)	13,432	(38,409)
Interest expense	37,906	48,911	134,564	158,157
Total expenses	1,612,204	1,592,462	4,661,032	4,936,543
Income (loss) before income tax and income (loss) from operating affiliates	205,280	65,557	655,623	31,516
Income (loss) from operating affiliates	2,917	35,552	41,731	95,439
Provision (benefit) for income tax	451	24,718	51,813	16,747
Net income (loss)	207,746	76,391	645,541	110,208
Non-controlling interests	(35,844)	(33,993)	(75,855)	(69,431)
Net income (loss) attributable to XL Group plc and ordinary shareholders	$ 171,902	$ 42,398	$ 569,686	$ 40,777
Weighted average ordinary shares and ordinary share equivalents outstanding - basic (in shares)	304,199	311,714	309,675	310,793
Weighted average ordinary shares and ordinary share equivalents outstanding - diluted (in shares)	307,764	313,848	312,602	314,842
Earnings (loss) per ordinary share and ordinary share equivalent - basic (in dollars per share)	$ 0.57	$ 0.14	$ 1.84	$ 0.13
Earnings (loss) per ordinary share and ordinary share equivalent - diluted (in dollars per share)	$ 0.56	$ 0.14	$ 1.82	$ 0.13