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FAIR VALUE MEASUREMENTS. (Reported on Balance Sheet) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair value measurements    
Investments in sponsored funds $ 1,307.8 $ 1,140.1
Debt securities held by savings bank subsidiary 125.0 136.0
Level 1 [Member]
   
Fair value measurements    
Total 2,836.1 1,891.0
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair value measurements    
Cash equivalents 1,494.8 732.8
Investments in sponsored funds 1,307.8 1,140.1
Investments held as trading 33.5 18.1
Level 2 [Member]
   
Fair value measurements    
Total 137.8 213.2
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
   
Fair value measurements    
Investments held as trading 12.8 77.2
Debt securities held by savings bank subsidiary $ 125.0 $ 136.0