Life Sciences Tools And Services [Member] Electronic Equipment Instruments And Components [Member] Multi Utilities [Member] Construction And Engineering [Member] Trading Companies And Distributors [Member] Building Products [Member] Commercial Services And Supplies [Member] Machinery [Member] Water Utilities [Member] C000066034 [Member] Institutional Class C000061367 [Member] Class C C000061366 [Member] Class A Chemicals Sector [Member] Common Stock [Member] C000075799 [Member] C000075797 [Member] C000160541 [Member] Class R6 Affiliated Mutual Funds [Member] Affiliated Exchange Traded Funds [Member] Banks [Member] Insurance [Member] Marine Transportation [Member] All other Common Stocks [Member] Equity Linked Notes [Member] Financial Services [Member] Banks Equity Linked Notes [Member] Convertible Bonds and Notes [Member] Computers [Member] Software [Member] Financial Services Convertible Bonds and Notes [Member] Convertible Preferred Stocks [Member] All other Convertible Bonds and Notes [Member] Electric Utilities [Member] C000235255 [Member] C000086661 [Member] C000086659 [Member] C000086658 [Member] Convertible Preferred Stock [Member] Short-Term Investments [Member] Insurance Sector [Member] C000086672 [Member] C000086675 [Member] C000165874 [Member] Metals And Mining [Member] Oil Gas And Consumable Fuels [Member] Banks Sector [Member] Semiconductors And Semiconductor Equipment [Member] Food Products [Member] Other includes short term investment [Member] Leveraged Loans [Member] All Other Corporate Bonds And Notes [Member] Communication Services [Member] Energy [Member] Financials [Member] Corporate Bonds And Note [Member] C000177646 [Member] C000103878 [Member] C000103877 [Member] C000103876 [Member] Other Investments [Member] Financial Services Sector [Member] Healthcare Sector [Member] C000118783 [Member] C000118780 [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag