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Variable Interest Entities (Tables)
6 Months Ended
Jun. 30, 2012
Variable Interest Entities  
Schedule of net assets and liabilities and maximum risk of losses related to unconsolidated VIEs

 

 
  December 31, 2011   June 30, 2012  
 
  Unconsolidated
VIE Net Assets
  Carrying Value and
Maximum Exposure
to Loss
  Unconsolidated
VIE Net Assets
  Carrying Value and
Maximum Exposure
to Loss
 

Sponsored investment funds

  $ 3,618.4   $ 1.1   $ 6,591.8   $ 1.7  

Trust preferred vehicles

    9.0     9.0     9.0     9.0