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Accrued Compensation and Benefits (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]    
Accrued performance fee-related compensation $ 1,803.9 $ 1,307.4
Accrued bonuses 261.2 177.2
Other 110.0 177.2
Total $ 2,175.1 $ 1,661.8