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Accrued Compensation and Benefits (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]    
Accrued performance fee-related compensation $ 1,546.5 $ 1,307.4
Accrued bonuses 80.1 177.2
Other 100.2 177.2
Total $ 1,726.8 $ 1,661.8