Contingent Convertible Securities Risk [Member] Credit Agency Risk [Member] Credit And Below Investment Grade Securities Risk [Member] Current Market Conditions Risk [Member] Cyber Security Risk [Member] Europe Risk [Member] Illiquid And Restricted Securities Risk [Member] Inflation Risk [Member] Interest Rate And Duration Risk [Member] Leverage Risk [Member] Management Risk And Reliance On Key Personnel [Member] Market Discount From Net Asset Value [Member] Market Risk [Member] Non U S Securities Risk [Member] Operational Risk [Member] Potential Conflicts Of Interest Risk [Member] Preferred Hybrid Preferred And Debt Securities Risk [Member] Reverse Repurchase Agreements Risk [Member] Risks Of Concentration In The Financials Sector [Member] Smaller Companies Risk [Member] Trust Preferred Securities Risk [Member] Valuation Risk [Member]