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Employee Share-Based Incentive Compensation Plans (WTM - Performance Shares) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 9 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Jun. 30, 2012
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Jun. 30, 2013
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Jun. 30, 2012
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Jun. 30, 2013
Performance Cycle 2010 to 2012
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Jun. 30, 2013
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Sep. 30, 2012
Performance cycle 2009-2011
Performance Share
Jun. 30, 2012
Performance cycle 2009-2011
WTM Incentive Plan and WTM Phantom Share Plans
Performance Share
Target Performance Share activity                    
Beginning of period (in shares)     118,976 118,450 119,357 150,064        
Shares paid or expired (in shares)     0 [1] 0 [1] (47,310) [1] (68,357) [1]        
New grants (in shares)     0 0 46,920 35,932        
Assumed forfeitures and cancellations     0 [2] 0 [2] 9 [2] 811 [2]        
Ending of period (in shares)     118,976 118,450 118,976 118,450        
Accrued Expense                    
Accrued expense at the beginning of period $ 125.9 $ 159.0 $ 28.6 $ 27.4 $ 29.4 $ 66.1        
Payments and deferrals     0 [1] 0 [1] (11.0) [1] (48.4) [1]        
Assumed forfeitures and cancellations     (0.1) [2] (0.2) [2] 0 [2] 0.8 [2]        
Expense recognized     6.4 5.5 16.5 14.2        
Accrued expense at the end of the period 125.9 159.0 34.9 32.7 34.9 32.7        
Vesting Period               3 years    
Percentage of target payout - minimum actual             33.00%     147.00%
Percentage of target payout - maximum actual             98.00%     155.00%
Vested (in shares)                 9,577  
Additional compensation cost that would be recognized if all outstanding performance shares vested     $ 38.8   $ 38.8          
[1] WTM performance share payments in 2013 for the 2010-2012 performance cycle ranged from 33% to 98% of target. WTM performance share payments in 2012 for the 2009-2011 performance cycle ranged from 147% to 155% of target.
[2] Amounts include changes in assumed forfeitures, as required under GAAP.