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Goodwill and Acquired Client Relationships - Schedule of Changes in Acquired Client Relationships (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Book Value      
Net book value balance at the beginning of the period $ 1,497.4    
Intangible amortization and impairments (86.4) $ (110.2) $ (115.4)
Net book value balance at the end of the period 1,449.7 1,497.4  
Acquired Client Relationships (Net)      
Definite-lived      
Gross book value, balance at the beginning of the period 1,290.0 1,301.8  
Accumulated amortization, balance at the beginning of the period (788.1) (680.4)  
Net book value, balance at the beginning of the period 501.9 621.4  
Intangible amortization and impairments (86.4) (107.7)  
Foreign currency translation 5.5 (11.8)  
Gross book value, balance at the end of the period 1,295.5 1,290.0 1,301.8
Accumulated amortization, balance at the end of the period (874.5) (788.1) (680.4)
Net book value, balance at the end of the period 421.0 501.9 621.4
Indefinite-lived      
Net book value, balance at the beginning of the period 995.5 1,065.0  
Impairment 0.0 (2.5)  
Foreign currency translation 33.2 (67.0)  
Net book value, balance at the end of the period 1,028.7 995.5 1,065.0
Net Book Value      
Net book value balance at the beginning of the period 1,497.4 1,686.4  
Intangible amortization and impairments (86.4) (110.2)  
Foreign currency translation 38.7 (78.8)  
Net book value balance at the end of the period $ 1,449.7 $ 1,497.4 $ 1,686.4