Core Bond Series (Class I) Core Bond Series (Class S) Core Bond Series (Class W) Core Bond Series (Class Z) Unconstrained Bond Series (Class I) Unconstrained Bond Series (Class S) Unconstrained Bond Series (Class W) High Yield Bond Series (Class I) High Yield Bond Series (Class S) High Yield Bond Series (Class W) High Yield Bond Series (Class Z) Diversified Tax Exempt Series (Class A) Diversified Tax Exempt Series (Class W) Callodine Equity Income Series (Class I) Callodine Equity Income Series (Class S) Callodine Equity Income Series (Class Z) Credit Series (Class I) Credit Series (Class S) Credit Series (Class W) Systematic High Yield Bond Series (Class I) Systematic High Yield Bond Series (Class S) Systematic High Yield Bond Series (Class W) Systematic High Yield Bond Series (Class Z) Investment Type [Axis] Cash, short-term investment, and other assets, less liabilities [Member] Energy Sector [Member] Financial Services Sector [Member] Healthcare Sector [Member] Real Estate Sector [Member] Municipal Bonds [Member] Exchange Traded Funds [Member] U.S. Treasury Bonds [Member] U.S. Treasury Notes [Member] U.S. Government Agencies [Member] Asset-Backed Securities [Member] Commercial Mortgage-Backed Securities [Member] Foreign Government Bonds [Member] Cash, short-term investment, and liabilities, less other assets [Member] Loan Assignments [Member] Preferred Stock [Member] NEW YORK WISCONSIN WASHINGTON ALABAMA TEXAS ILLINOIS DISTRICT OF COLUMBIA FLORIDA TENNESSEE PENNSYLVANIA Revenue Bonds [Member] General Obligation Bonds [Member] Common Stocks [Member] Common Stock [Member] Core Bond Series (Class I) Core Bond Series (Class S) Core Bond Series (Class W) Core Bond Series (Class Z) Unconstrained Bond Series (Class I) Unconstrained Bond Series (Class S) Unconstrained Bond Series (Class W) High Yield Bond Series (Class I) High Yield Bond Series (Class S) High Yield Bond Series (Class W) High Yield Bond Series (Class Z) Diversified Tax Exempt Series (Class A) Diversified Tax Exempt Series (Class W) Callodine Equity Income Series (Class I) Callodine Equity Income Series (Class S) Callodine Equity Income Series (Class Z) Credit Series (Class I) Credit Series (Class S) Credit Series (Class W) Systematic High Yield Bond Series (Class I) Systematic High Yield Bond Series (Class S) Systematic High Yield Bond Series (Class W) Systematic High Yield Bond Series (Class Z) Cash, short-term investment, and other assets, less liabilities member U.S. Treasury Bonds. U.S. Treasury Notes. U.S. Government Agencies. Foreign Government Bonds. Cash, short-term investment, and liabilities, less other assets. Loan Assignments. Revenue Bonds. General Obligation Bonds. Common Stocks. Net Assets Investment Company, Portfolio Turnover