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Employee Share-Based Incentive Compensation Plans (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
WTM Restricted Stock
Jun. 30, 2011
WTM Restricted Stock
Jun. 30, 2012
WTM Restricted Stock
Jun. 30, 2011
WTM Restricted Stock
Jun. 30, 2012
Restricted shares that will cliff vest in January, 2015
Mar. 31, 2011
Restricted Share Cliff Vesting in January, 2014
Jun. 30, 2012
Restricted Share Cliff Vesting in January, 2014
Jun. 30, 2012
Restricted Share Vesting Beginning in February 2014
Activity in plan                
Beginning of period (in shares) 93,460 73,250 72,000 46,250        
Issued (in shares) 0 250 28,460 27,250 25,460 27,000 250 3,000
Vested (in shares) 0 0 (7,000) 0        
Ending of period (in shares) 93,460 73,500 93,460 73,500        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 0 0 0 0        
Employee Service Share-based Compensation Nonvested Awards, Forfeited in Period Total Compensation Cost Not yet Recognized $ 0 $ 0 $ 0 $ 0        
Unamortized grant date fair value                
Unamortized grant date fair value, beginning balance 24.5 21.7 13.3 14.1        
Issued 0 0.1 13.7 9.9        
Expense recognized (3.0) (2.9) (5.5) (5.1)        
Unamortized grant date fair value, ending balance $ 21.5 $ 18.9 $ 21.5 $ 18.9