1001 - Disclosure - N-2 - [Fee Table] link:presentationLink link:definitionLink link:calculationLink 1002 - Disclosure - N-2 - [Senior Securities] link:presentationLink link:definitionLink link:calculationLink 1003 - Disclosure - N-2 - [Investment Objectives] link:presentationLink link:definitionLink link:calculationLink 1004 - Disclosure - N-2 - [Risk Factors] link:presentationLink link:definitionLink link:calculationLink 1005 - Disclosure - N-2 - [Effects of Leverage] link:presentationLink link:definitionLink link:calculationLink 1006 - Disclosure - N-2 - [Share Price Table] link:presentationLink link:definitionLink link:calculationLink 1007 - Disclosure - N-2 - [Outstanding Securities] link:presentationLink link:definitionLink link:calculationLink Common Shares [Member] At The Market Transaction [Member] Borrowings Outstanding [Member] Taxable Fund Preferred TFP Shares [Member] Equity Securities Risk [Member] Hedging Risk [Member] Income Risk [Member] Recent Market Conditions [Member] Reverse Repurchase Agreement Risk [Member] Swap Transactions Risk [Member] Below Investment Grade Risk [Member] Fund Tax Risk [Member] Credit Spread Risk [Member] Common Stock Risk [Member] Convertible Securities Risk [Member] U.S. Government Securities Risk [Member] Deflation Risk [Member] Inflation Risk [Member] When Issued and Delayed Delivery Transactions Risk [Member] Credit Risks [Member] Preferred and Hybrid Preferred Securities Risk [Member] Legislation and Regulatory Risk [Member] Real Estate Investment Trust Risk [Member] Other Investment Companies Risk [Member] Unrated Securities Risk [Member] Call Risk [Member] Duration Risk [Member] Anti Takeover Provisions [Member] Investment and Market Risk [Member] Financial Futures and Options Transactions Risk [Member] Reinvestment Risk [Member] Debt Securities Risk [Member] Cybersecurity Risk [Member] Warrants and Equity Securities Risk [Member] Floating Rate and Fixed to Floating Rate Securities Risk [Member] Floating-Rate and Fixed-to-Floating-Rate Securities Risk [Member] Borrowing Risk [Member] Global Economic Risk [Member] Market Discount from Net Asset Value [Member] Foreign Currency Risk [Member] Leverage Risk [Member] Derivatives Risk [Member] Inflation Correlation Risk [Member] Zero Coupon Bonds or PayInKind Securities Risk [Member] Counterparty Risk [Member] Restricted and Illiquid Investments Risk [Member] Contingent Capital Securities (CoCos) Risk [Member] Valuation Risk [Member] Depositary Receipts Risk [Member] Foreign Emerging Markets Issuer Risk [Member] Foreign/Emerging Markets Issuer Risk [Member] Inverse Floating Rate Securities Risk [Member] Municipal Securities Risk [Member] Municipal Securities Market Liquidity Risk [Member] Municipal Securities Market Risk [Member] Regulation S Securities Risk [Member] Subsidiary Risk [Member] TEFRA Bond Risk [Member] Concentration and Financial Services Industry Risk [Member] TEFRA Bond Subsidiary Risk [Member]