Liability for Unpaid Loss and Loss Adjustment Expense	12 Months Ended
	Dec. 31, 2011
Liability for Unpaid Loss and Loss Adjustment Expense
Liability for Unpaid Claims and Claims Adjustment Expense Schedule, Discussion	(6) Liability for Unpaid Loss and Loss Adjustment Expense   The table below provides a reconciliation of the liability for unpaid loss and loss adjustment expense payable at December 31, 2011, 2010 and 2009. ##RS Our U.S. Property & Casualty, U.S. Surety & Credit and International segments reported favorable loss development in 2011, 2010 and 2009. The favorable development in 2011 was more than offset by an increase in reserves for the diversified financial products line of business in our Professional Liability segment. The current year net loss and loss adjustment expense includes net catastrophe losses of $103.9 million in 2011 and $22.5 million in 2010, primarily in our International segment. We had no significant catastrophe losses in 2009. We have no material exposure to asbestos claims or environmental pollution losses. Our largest insurance company began writing business in 1981, and its policies normally exclude intentional dumping and seepage claims. Policies issued by our other insurance companies do not have significant environmental exposure because of the types of risks covered.