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Intangible Assets - Schedule of Changes in the Components of Acquired Client Relationships (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Acquired Client Relationships
Definite-lived      
Beginning balance, gross (in dollars)     $ 1,039.5
Beginning balance, accumulated amortization     (442.8)
Beginning balance, net (in dollars)     596.7
New investments     149.6
Amortization and impairments     (84.2)
Foreign currency translation     (1.3)
Ending balance, gross (in dollars)     1,187.8
Ending balance, accumulated amortization     (527.0)
Ending balance, net (in dollars)     660.8
Indefinite-lived      
Beginning balance, net (in dollars)     864.0
New investments     46.8
Amortization and impairments     0
Foreign currency translation     (5.0)
Ending balance, net (in dollars)     905.8
Total      
Beginning balance, net (in dollars) 1,566.6 1,460.7 1,460.7
New investments     196.4
Amortization and impairments     (84.2)
Foreign currency translation     (6.3)
Ending balance, net (in dollars) $ 1,566.6 $ 1,460.7 $ 1,566.6