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Business Combinations Schedule of purchase price allocation for investments (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Southern Sun Asset Management, LLC [Member]
Business Acquisition [Line Items]      
Consideration paid     $ 109.9
Non-controlling interests     78.9
Enterprise value     188.8
Acquired client relationships     126.9
Tangible assets, net     6.2
Goodwill 2,385.9 2,341.7 55.7
Total     $ 188.8