v2.4.0.8
Reserve for Losses and Loss Adjustment Expenses (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of reserve for losses and loss adjustment expenses        
Minimum Period For Claims Resolution     5 years  
Net losses:        
Favorable development of reserves established in prior years, net $ 38.5 $ 60.1 $ 91.6 $ 107.5
Liability For Future Policy Benefits Period Expense Accident Years 2006 through 2011   2005 through 2011 2004 through 2009