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Investments - Investments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Consolidation Of Investment [Line Items]
Equity method investments, excluding accrued performance fees	$ 828.7	$ 855.1
Trading securities and other investments	27.5	26.1
Total investments	$ 856.2	$ 881.2

- Definition

Total investments, other than debt and equity securities, that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time).

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