SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Management Fees) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Annual management fee rates for open-end funds (as a percent)	0.50%
Ancillary fees recognized	$ 62.9	$ 25.9	$ 35.3
Minimum
Management fees for closed-end funds (as a percent)	1.25%
Management fees, term (in years)	10 years
Annual management fee rates for evergreen funds ( as a percent)	1.50%
Maximum
Management fees for closed-end funds (as a percent)	1.75%
Management fees, term (in years)	11 years
Annual management fee rates for evergreen funds ( as a percent)	2.00%