2.2.0.25falsefalse01230 - Disclosure - Subsequent Eventstruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $FROM_Jan01_2010_TO_Dec31_2010http://www.sec.gov/CIK0000911421duration2010-01-01T00:00:002010-12-31T00:00:00SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0EPSDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0pre_DisclosureSubsequentEventsAbstractprefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseDisclosure - Subsequent Events [Abstract]3false0us-gaap_ScheduleOfSubsequentEventsTextBlockus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse0024. Subsequent Events During January 2011, torrential rain and widespread flooding impacted large areas of Australia, including Queensland and Victoria. Additionally, on February 3, 2011, Tropical Cyclone Yasi made landfall as a Category 4 storm in North Queensland, Australia, causing widespread property damage and flooding across the region. The Company's initial total net loss estimate for these events is expected to be in the range of $80 to $110 million, pre-tax, net of retrocession and reinstatement premiums, and primarily recorded within the Company's Global (Non-U.S.) P&C and Catastrophe sub-segments. The Company is continuing to assess its exposure related to these 2011 events.On February 22, 2011, a major earthquake measuring 6.3 on the Richter Scale caused severe damage in Christchurch, New Zealand. The Company has exposure to this event primarily through its Global (Non-U.S.) P&C and Catastrophe sub-segments. The Company is currently assessing its potential claims related to this event, but information as of February 28, 2011 is not sufficient to arrive at a reasonable estimate.In January and February 2011, the Company repurchased 2.7 million of its common shares at a total cost of $220 million, representing an average cost of $81.54 per share. Following these share repurchases, the Company had approximately 3.8 million common shares remaining under its current share repurchase authorization and approximately 16.7 million shares held in treasury.24. Subsequent Events During January 2011, torrential rain and widespread flooding impacted large areas of Australia, including Queensland and Victoria.falsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescribes disclosed significant events or transactions that occurred after the balance sheet date, but before the issuance of the financial statements. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 11 falsefalseSubsequent Events12Subsequent EventsUnKnownUnKnownUnKnownUnKnownfalsetrue