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Accrued Compensation and Benefits (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]    
Accrued performance fee-related compensation $ 1,511.9 $ 1,815.4
Accrued bonuses 211.9 229.6
Employment-based contingent cash consideration 80.4 156.8
Other 149.0 110.7
Total $ 1,953.2 $ 2,312.5