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Consolidation of Sponsored Investment Products - Consolidated Statement of Balance Sheets (Parenthetical) (Detail) (Consolidated Investment Products [Member], Reportable Legal Entities [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Consolidated Investment Products [Member] | Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Other current assets of consolidated sponsored investment products	$ 41.0

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- Definition

Other Current Assets Related to Unsettled Fund Share Receivables Of Consolidated Sponsored Investment Products

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