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Goodwill and Acquired Client Relationships - Schedule of changes in and the components of acquired client relationships (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Net Book Value    
Total, Net book value balance at the beginning of the period $ 1,585.5 $ 1,321.1
Total, New investments 0 452.6
Total, Amortization and Impairment (128.2) (200.0)
Total, Foreign currency translation 3.4 11.8
Total, Transfers and other 0 0
Total, Net book value balance at the end of the period 1,460.7 1,585.5
Acquired client relationships [Member]
    
Definite-lived    
Gross book value balance at the beginning of the period 1,109.6 970.5
Accumulated amortization balance at the beginning of the period (383.5) (317.0)
Net book value balance at the beginning of the period 726.1 653.5
New Investments 0 131.1
Amortization and impairments (128.2) (97.8)
Foreign currency translation (1.2) 1.1
Gross Book Value, Definite-lived, Transfers and other (68.9) 6.9
Accumulated Amortization, Definite-lived, Transfers and other 68.9 31.3
Net Book Value, Definite-lived, Transfers and other 0 38.2
Gross book value balance at the end of the period 1,039.5 1,109.6
Accumulated amortization balance at the end of the period (442.8) (383.5)
Net book value balance at the end of the period 596.7 726.1
Indefinite-lived    
Net book value balance at the beginning of the period 859.4 667.6
New investments 0 321.5
Amortization and Impairment 0 (102.2)
Foreign currency translation 4.6 10.7
Transfers and other 0 (38.2)
Net book value balance at the end of the period $ 864.0 $ 859.4