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FAIR VALUE MEASUREMENTS. (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Fair value measurements    
Investments in sponsored funds $ 1,805.1 $ 1,884.0
Level 1 [Member]    
Fair value measurements    
Total 2,746.7 3,257.5
Level 1 [Member] | Fair value, measurements, recurring [Member]    
Fair value measurements    
Cash equivalents 909.6 1,345.8
Investments in sponsored funds 1,805.1 1,884.0
Investments held as trading 32.0 27.7
Level 2 [Member]    
Fair value measurements    
Total 41.7 52.2
Level 2 [Member] | Fair value, measurements, recurring [Member]    
Fair value measurements    
Cash equivalents 0.0 0.0
Investments in sponsored funds 0.0 0.0
Investments held as trading $ 41.7 $ 52.2