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]
|
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Fair value measurements | ||
Total | 2,836.1 | 1,891.0 |
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
|
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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]
|
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Fair value measurements | ||
Total | 137.8 | 213.2 |
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
|
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Fair value measurements | ||
Investments held as trading | 12.8 | 77.2 |
Debt securities held by savings bank subsidiary | $ 125.0 | $ 136.0 |