FAIR VALUE MEASUREMENTS. (Detail) - USD ($) $ in Millions |
Sep. 30, 2015 |
Dec. 31, 2014 |
---|---|---|
Fair value measurements | ||
Investments in sponsored funds | $ 1,805.1 | $ 1,884.0 |
Level 1 [Member] | ||
Fair value measurements | ||
Total | 2,746.7 | 3,257.5 |
Level 1 [Member] | Fair value, measurements, recurring [Member] | ||
Fair value measurements | ||
Cash equivalents | 909.6 | 1,345.8 |
Investments in sponsored funds | 1,805.1 | 1,884.0 |
Investments held as trading | 32.0 | 27.7 |
Level 2 [Member] | ||
Fair value measurements | ||
Total | 41.7 | 52.2 |
Level 2 [Member] | Fair value, measurements, recurring [Member] | ||
Fair value measurements | ||
Cash equivalents | 0.0 | 0.0 |
Investments in sponsored funds | 0.0 | 0.0 |
Investments held as trading | $ 41.7 | $ 52.2 |