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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Receivables) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Receivables from sponsored mutual funds    
Accounts receivable for advisory fees and advisory-related administrative services $ 482.5 $ 455.1
Sponsored U.S. mutual funds and other sponsored investment portfolios [Member]    
Receivables from sponsored mutual funds    
Accounts receivable for advisory fees and advisory-related administrative services $ 318.6 $ 303.1