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Variable Interest Entities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Sponsored investment funds [Member]
   
Variable Interest Entities    
Unconsolidated VIE Net Assets $ 7,511.8 $ 7,186.9
Carrying Value and Maximum Exposure to Loss 1.6 0.8
Trust preferred vehicles [Member]
   
Variable Interest Entities    
Unconsolidated VIE Net Assets 9.0 9.0
Carrying Value and Maximum Exposure to Loss $ 9.0 $ 9.0