Risk of Market Price Discount from Net Asset Value [Member] Preferred Securities Risk [Member] Contingent Capital Securities Risk [Member] Concentration Risk [Member] Credit and Below Investment Grade Securities Risk [Member] Liquidity Risk [Member] Foreign Non U S and Emerging Market Securities Risk [Member] Foreign Currency Risk [Member] Leverage Risk [Member] Derivatives and Hedging Transactions Risk [Member] Market Disruption and Geopolitical Risk [Member] Regulatory Risk [Member] Cybersecurity Risk [Member]