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Goodwill and Acquired Client Relationships - Schedule of Changes in, and the Components of, Acquired Client Relationships (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Net Book Value    
Net book value balance at the beginning of the period $ 1,778.4  
Net book value balance at the end of the period 1,686.4 $ 1,778.4
Customer Relationships    
Definite-lived    
Gross book value balance at the beginning of the period 1,255.1 1,039.5
Accumulated amortization balance at the beginning of the period (565.0) (442.8)
Net book value balance at the beginning of the period 690.1 596.7
New Investments 52.5 220.3
Amortization and impairments (115.4) (122.2)
Foreign currency translation (5.8) (4.7)
Gross book value balance at the end of the period 1,301.8 1,255.1
Accumulated amortization balance at the end of the period (680.4) (565.0)
Net book value balance at the end of the period 621.4 690.1
Indefinite-lived    
Net book value balance at the beginning of the period 1,088.3 864.0
New investments 0.0 244.7
Amortization and Impairment 0.0 0.0
Foreign currency translation (23.3) (20.4)
Net book value balance at the end of the period 1,065.0 1,088.3
Net Book Value    
Net book value balance at the beginning of the period 1,778.4 1,460.7
New investments 52.5 465.0
Amortization and Impairment (115.4) (122.2)
Foreign currency translation (29.1) (25.1)
Net book value balance at the end of the period $ 1,686.4 $ 1,778.4