US Treasury Obligations [Member] Non Agency Commercial Mortgage Backed Securities [Member] Loan Agreements [Member] Exchange Traded Funds [Member] Corporate Bond Securities [Member] Rights [Member] Sovereign Debt [Member] Common Stock [Member] Ventas [Member] Diamondback Energy [Member] United Utilities Group [Member] Prologis [Member] Welltower [Member] Enbridge [Member] Equinix [Member] VICI Properties [Member] National Grid [Member] Nutrien [Member] C000011041 [Member] Class A C000174774 [Member] Class R6 C000011043 [Member] Class C C000011044 [Member] Class R C000011045 [Member] Institutional Class Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag