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Goodwill and Acquired Client Relationships - Schedule of Changes in the Components of Acquired Client Relationships (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Total  
Beginning balance, net book value $ 1,309.9
Ending balance, net book value 1,289.5
Acquired Client Relationships  
Definite-lived  
Beginning balance, gross book value 1,292.5
Beginning balance, accumulated amortization (988.9)
Beginning balance, net book value 303.6
Amortization and impairments (29.6)
Foreign currency translation 1.0
Ending balance, gross book value 1,293.5
Ending balance, accumulated amortization (1,018.5)
Ending balance, net book value 275.0
Indefinite-lived  
Beginning balance, net book value 1,006.3
Amortization and impairments 0.0
Foreign currency translation 8.2
Ending balance, net book value 1,014.5
Total  
Beginning balance, net book value 1,309.9
Amortization and impairments (29.6)
Foreign currency translation 9.2
Ending balance, net book value $ 1,289.5