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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Investment advisory services          
Revenues from advisory services $ 768,300,000 $ 661,400,000 $ 2,210,900,000 $ 1,914,400,000  
Average assets under management 636,300,000,000 557,800,000,000 620,900,000,000 542,200,000,000  
Period end assets under management 647,200,000,000   647,200,000,000   576,800,000,000
Sponsored mutual funds in the U.S. [Member]
         
Investment advisory services          
Revenues from advisory services 541,300,000 458,100,000 1,551,300,000 1,318,300,000  
Average assets under management 396,200,000,000 332,500,000,000 381,300,000,000 321,100,000,000  
Period end assets under management 403,800,000,000   403,800,000,000   346,900,000,000
Sponsored mutual funds in the U.S. [Member] | Stock and blended asset [Member]
         
Investment advisory services          
Revenues from advisory services 452,000,000 368,100,000 1,276,300,000 1,059,600,000  
Average assets under management 305,400,000,000 246,400,000,000 289,500,000,000 237,800,000,000  
Period end assets under management 312,400,000,000   312,400,000,000   256,900,000,000
Sponsored mutual funds in the U.S. [Member] | Bond and money market [Member]
         
Investment advisory services          
Revenues from advisory services 89,300,000 90,000,000 275,000,000 258,700,000  
Average assets under management 90,800,000,000 86,100,000,000 91,800,000,000 83,300,000,000  
Period end assets under management 91,400,000,000   91,400,000,000   90,000,000,000
Other portfolios [Member]
         
Investment advisory services          
Revenues from advisory services 227,000,000 203,300,000 659,600,000 596,100,000  
Average assets under management 240,100,000,000 225,300,000,000 239,600,000,000 221,100,000,000  
Period end assets under management 243,400,000,000   243,400,000,000   229,900,000,000
Other portfolios [Member] | Stock and blended asset [Member]
         
Investment advisory services          
Revenues from advisory services 187,400,000 160,200,000 538,100,000 472,100,000  
Average assets under management 182,500,000,000 159,200,000,000 177,300,000,000 156,900,000,000  
Period end assets under management 181,400,000,000   181,400,000,000   164,200,000,000
Other portfolios [Member] | Bond, money market, and stable value [Member]
         
Investment advisory services          
Revenues from advisory services 39,600,000 43,100,000 121,500,000 124,000,000  
Average assets under management 57,600,000,000 66,100,000,000 62,300,000,000 64,200,000,000  
Period end assets under management $ 62,000,000,000   $ 62,000,000,000   $ 65,700,000,000