UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (loss) attributable to XL Group plc	$ 350,790	$ 176,628
Change in net unrealized gains (losses) on investments, net of tax	(112,222)	212,324
Change in net unrealized gains (losses) on affiliate and other investments, net of tax	(4,435)	15,050
Change in OTTI losses recognized in other comprehensive income, net of tax	5,182	12,421
Change in underfunded pension liability	385	(174)
Change in value of cash flow hedge	110	110
Foreign currency translation adjustments	(3,921)	8,721
Comprehensive income (loss)	$ 235,889	$ 425,080