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Business Combinations Schedule of purchase price allocation for investments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
New Affiliates [Member]
Business Acquisition [Line Items]        
Consideration paid       $ 417.8
Non-controlling interests       247.6
Contingent payment obligations       24.8
Enterprise value       690.2
Acquired client relationships       452.6
Tangible assets, net       11.7
Goodwill 2,341.7 2,355.2 2,117.3 225.9
Total       $ 690.2