Period ended	4-30-25¹	10-31-24	10-31-23	10-31-22	10-31-21	10-31-20
Per share operating performance
Net asset value, beginning of period	$13.59	$10.58	$12.60	$14.88	$12.84	$15.74
Net investment income²	0.30	0.52	0.48	0.72	0.83	0.83
Net realized and unrealized gain (loss) on investments	(0.04)	3.48	(1.39)	(1.83)	2.40	(2.53)
Total from investment operations	0.26	4.00	(0.91)	(1.11)	3.23	(1.70)
Less distributions
From net investment income	(0.50)	(0.99)	(0.98)	(1.17)	(1.17)	(1.17)
From net realized gain	—	—	—	—	(0.02)	(0.03)
From tax return of capital	—	—	(0.13)	—	—	—
Total distributions	(0.50)	(0.99)	(1.11)	(1.17)	(1.19)	(1.20)
Premium from shares sold through shelf offering	—	—	—³	—³	—	—
Net asset value, end of period	$13.35	$13.59	$10.58	$12.60	$14.88	$12.84
Per share market value, end of period	$12.64	$12.83	$9.57	$13.99	$17.27	$12.55
Total return at net asset value (%)^4,5	2.06⁶	39.63	(7.65)	(8.30)	25.56	(10.89)
Total return at market value (%)⁴	2.35⁶	45.73	(24.77)	(12.28)	49.09	(22.55)
Ratios and supplemental data
Net assets, end of period (in millions)	$657	$668	$521	$619	$726	$625
Ratios (as a percentage of average net assets):
Expenses before reductions	4.39⁷	5.26	5.07	2.42	1.82	2.32
Expenses including reductions⁸	4.38⁷	5.25	5.06	2.41	1.81	2.31
Net investment income	4.51⁷	4.17	3.93	5.08	5.78	6.07
Portfolio turnover (%)	11	27	26	16	17	24
Senior securities
Total debt outstanding end of period (in millions)	$374	$374	$374	$374	$374	$374
Asset coverage per $1,000 of debt⁹	$2,757	$2,789	$2,393	$2,655	$2,943	$2,672


¹	Six months ended 4-30-25. Unaudited.
²	Based on average daily shares outstanding.
³	Less than $0.005 per share.
⁴	Total return based on net asset value reflects changes in the fund’s net asset value during each period. Total return based on market value reflects changes in market value. Each figure assumes that distributions from income, capital gains and tax return of capital, if any, were reinvested.
⁵	Total returns would have been lower had certain expenses not been reduced during the applicable periods.
⁶	Not annualized.
⁷	Annualized.
⁸	Expenses including reductions excluding interest expense were 1.46% (annualized), 1.52%, 1.54%, 1.39%, 1.41% and 1.48% for the periods ended 4-30-25, 10-31-24, 10-31-23, 10-31-22, 10-31-21 and 10-31-20, respectively.
⁹	Asset coverage equals the total net assets plus borrowings divided by the borrowings of the fund outstanding at period end (Note 8). As debt outstanding changes, the level of invested assets may change accordingly. Asset coverage ratio provides a measure of leverage.

Senior Securities Amount

$ 374

^[1]

$ 374

Senior Securities Coverage per Unit

^[2]

$ 2,757

^[1]

$ 2,789

$ 2,393

$ 2,655

$ 2,943

$ 2,672

General Description of Registrant [Abstract]

Investment Objectives and Practices [Text Block]

Investment Objective

The Fund’s investment objective is to provide high current income, consistent with modest growth of capital. The Fund will pursue its objective by investing in a diversified portfolio comprised primarily of dividend paying preferred securities and common equity securities.

Principal Investment Strategies

Under normal circumstances, the Fund will invest at least 80% of its net assets (plus borrowings for investment purposes) in dividend-paying securities. This is a non-fundamental policy and may be changed by the Board of Trustees of the fund provided that shareholders are provided with at least 60 days prior written notice of any change as required by the rules under the 1940 Act. The Fund will focus on common stocks of those issuers which, in the opinion of the Advisor, have strong fundamental characteristics, large market capitalizations, favorable credit quality and current dividend yields generally higher than the currently available dividend yield quoted on the Standard & Poor’s 500 Index. The Advisor intends to manage the Fund’s portfolio to generate income qualifying for the dividends received deduction (the Dividends Received Deduction) allowed corporations under Section 243(a)(1) of the Internal Revenue Code of 1986, as amended (the Code).

The Fund may invest in floating-rate, fixed-to-floating rate, and fixed-rate preferred securities and debt obligations rated investment grade (at least "BBB" by Standard & Poor’s or "Baa" by Moody’s) at the time of investment or that are preferred securities of issuers of investment grade senior debt, some of which may have speculative characteristics, or, if not rated, will be of comparable quality as determined by the Advisor. The fund may invest in U.S. and foreign debt securities including, but not limited to, bonds, notes, bills and debentures. The Fund will invest in common stocks of issuers whose senior debt is rated investment grade or, in the case of issuers that have no rated senior debt outstanding, whose senior debt is considered by the Advisor to be of comparable quality.

The Fund may invest in money market instruments, which include short-term U.S. Government securities, investment grade commercial paper (unsecured promissory notes issued by corporations to finance their short-term credit needs), certificates of deposit and bankers’ acceptances.

The Fund may invest up to 10% of the value of its total assets in dividend-paying securities of registered investment companies that invest primarily in investment grade securities. The investment companies in which the fund intends to invest include those open- and closed-end investment companies whose distributions qualify for the Dividends Received Deduction.

The fund concentrates its investments in securities of issuers primarily engaged in the utilities industry. The Fund may also invest in derivatives such as futures contracts, options, interest rate swaps and reverse repurchase agreements. The Fund intends to use reverse repurchase agreements to obtain investment leverage either alone and/or in combination with other forms of investment leverage or for temporary purposes. The fund also utilizes a liquidity agreement to increase its assets available for investments and may seek to obtain additional income or portfolio leverage by making secured loans of its portfolio securities with a value of up to 33 1/3% of its total assets.

The Fund may invest up to 20% of its net assets in restricted securities purchased in direct placements.

The manager may consider environmental, social, and/or governance (ESG) factors, alongside other relevant factors, as part of its investment process. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. The ESG characteristics utilized in

the fund’s investment process may change over time and one or more characteristics may not be relevant with respect to all issuers that are eligible fund investments. Because ESG factors are considered alongside other relevant factors, the manager may determine that an investment is appropriate notwithstanding its relative ESG characteristics.

Risk Factors [Table Text Block]

Principal Risks

As is the case with all exchange-listed closed-end funds, shares of this fund may trade at a discount or a premium to the fund’s net asset value (NAV). An investment in the fund is subject to investment and market risks, including the possible loss of the entire principal invested.

The fund’s main risks are listed below in alphabetical order, not in order of importance.

Changing distribution level & return of capital risk. There is no guarantee prior distribution levels will be maintained, and distributions may include a substantial tax return of capital. A return of capital is the return of all or a portion of a shareholder’s investment in the fund, which may increase the potential tax gain or decrease the potential tax loss of a subsequent sale of shares of the fund. For the fiscal year ended October 31, 2024, the fund’s aggregate distributions included no tax return of capital.

Concentration risk. Because the fund may focus on one or more industries or sectors of the economy, its performance depends in large part on the performance of those industries or sectors. As a result, the value of an investment may fluctuate more widely since it is more susceptible to market, economic, political, regulatory, and other conditions and risks affecting those industries or sectors than a fund that invests more broadly across industries and sectors.

Credit and counterparty risk. The issuer or guarantor of a fixed-income security, the counterparty to an over-the-counter derivatives contract, or a borrower of fund securities may not make timely payments or otherwise honor its obligations. U.S. government securities are subject to varying degrees of credit risk depending upon the nature of their support. A downgrade or default affecting any of the fund’s securities could affect the fund’s performance.

Dividend strategy risk. The Subadvisor may not be able to anticipate the level of dividends that companies will pay in any given timeframe. In accordance with the fund’s strategies, the Subadvisor attempts to identify and exploit opportunities such as the announcement of major corporate actions that may lead to high current dividend income. These situations typically are non-recurring or infrequent, may be difficult to predict and may not result in an opportunity that allows the Subadvisor to fulfill the fund’s investment objective. In addition, the dividend policies of the fund’s target companies are heavily influenced by the current economic climate and the favorable U.S. federal tax treatment afforded to dividends.

Economic and market events risk. Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility, which could negatively impact performance. Reduced liquidity in credit and fixed-income markets could adversely affect issuers worldwide. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.

Equity securities risk. The price of equity securities may decline due to changes in a company’s financial condition or overall market conditions.

ESG integration risk. The manager considers ESG factors that it deems relevant or additive, along with other material factors and analysis, when managing the fund. The manager may consider these ESG factors on all or a meaningful portion of the fund’s investments. In certain situations, the extent to which these ESG factors may be applied according to the manager’s integrated investment process may not include U.S. Treasuries, government securities, or other asset classes. ESG factors may include, but are not limited to, matters regarding board diversity, climate change policies, and supply chain and human rights policies. Incorporating ESG criteria and making investment decisions based on certain ESG characteristics, as determined by the manager, carries the risk that the

fund may perform differently, including underperforming funds that do not utilize ESG criteria or funds that utilize different ESG criteria. Integration of ESG factors into the fund’s investment process may result in a manager making different investments for the fund than for a fund with a similar investment universe and/or investment style that does not incorporate such considerations in its investment strategy or processes, and the fund’s investment performance may be affected. Because ESG factors are one of many considerations for the fund, the manager may nonetheless include companies with low ESG characteristics or exclude companies with high ESG characteristics in the fund’s investments.

Fixed-income securities risk. A rise in interest rates typically causes bond prices to fall. The longer the average maturity or duration of the bonds held by a fund, the more sensitive it will likely be to interest-rate fluctuations. An issuer may not make all interest payment or repay all or any of the principal borrowed. Changes in a security’s credit qualify may adversely affect fund performance. Additionally, the value of inflation-indexed securities is subject to the effects of changes in market interest rates caused by factors other than inflation (“real interest rates”). Generally, when real interest rates rise, the value of inflation-indexed securities will fall and the fund’s value may decline as a result of this exposure to these securities.

Foreign securities risk. Funds that invest in securities traded principally in securities markets outside the United States are subject to additional and more varied risks, as the value of foreign securities may change more rapidly and extremely than the value of U.S. securities. Less information may be publicly available regarding foreign issuers, including foreign government issuers. Foreign securities may be subject to foreign taxes and may be more volatile than U.S. securities. Currency fluctuations and political and economic developments may adversely impact the value of foreign securities. The securities markets of many foreign countries are relatively small, with a limited number of companies representing a small number of industries. Additionally, issuers of foreign securities may not be subject to the same degree of regulation as U.S. issuers. Reporting, accounting, and auditing standards of foreign countries differ, in some cases significantly, from U.S. standards. There are generally higher commission rates on foreign portfolio transactions, transfer taxes, higher custodial costs, and the possibility that foreign taxes will be charged on dividends and interest payable on foreign securities, some or all of which may not be reclaimable. Also, adverse changes in investment or exchange control regulations (which may include suspension of the ability to transfer currency or assets from a country); political changes; or diplomatic developments could adversely affect a fund’s investments. In the event of nationalization, expropriation, confiscatory taxation, or other confiscation, the fund could lose a substantial portion of, or its entire investment in, a foreign security. Some of the foreign securities risks are also applicable to funds that invest a material portion of their assets in securities of foreign issuers traded in the United States.

Hedging, derivatives, and other strategic transactions risk. Hedging, derivatives, and other strategic transactions may increase a fund’s volatility and could produce disproportionate losses, potentially more than the fund’s principal investment. Risks of these transactions are different from and possibly greater than risks of investing directly in securities and other traditional instruments. Under certain market conditions, derivatives could become harder to value or sell and may become subject to liquidity risk (i.e., the inability to enter into closing transactions). Derivatives and other strategic transactions that the fund intends to utilize include: futures contracts, options, interest rate swaps and reverse repurchase agreements. Futures contracts, options, and swaps generally are subject to counterparty risk. In addition, swaps may be subject to interest-rate and settlement risk, and the risk of default of the underlying reference obligation. An event of default or insolvency of the counterparty to a reverse repurchase agreement could result in delays or restrictions with respect to the fund’s ability to dispose of the underlying securities. In addition, a reverse repurchase agreement may be considered a form of leverage and may, therefore, increase fluctuations in the fund’s NAV.

Illiquid and restricted securities risk. Illiquid and restricted securities may be difficult to value and may involve greater risks than liquid securities. Illiquidity may have an adverse impact on a particular security’s market price and the fund’s ability to sell the security.

Investment company securities risk. Fund shareholders indirectly bear their proportionate share of the expenses of any investment company in which the fund invests. The total return on such investments will be reduced by the operating expenses and fees of such other investment companies, including advisory fees.

Large company risk. Larger companies may grow more slowly than smaller companies or be slower to respond to business developments. Large-capitalization securities may underperform the market as a whole.

Leveraging risk. Issuing preferred shares or using derivatives may result in a leveraged portfolio. Leveraging long exposures increases a fund’s losses when the value of its investments declines. Some derivatives have the potential for unlimited loss, regardless of the size of the initial investment. The fund also utilizes a Liquidity Agreement to increase its assets available for investment. See “Note 7 — Leverage risk” above.

Liquidity risk. The extent (if at all) to which a security may be sold or a derivative position closed without negatively impacting its market value may be impaired by reduced market activity or participation, legal restrictions, or other economic and market impediments. Widespread selling of fixed-income securities during periods of reduced demand may adversely impact the price or salability of such securities.

Operational and cybersecurity risk. Cybersecurity breaches may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause a fund or its service providers to suffer data corruption or lose operational functionality. Similar incidents affecting issuers of a fund’s securities may negatively impact performance. Operational risk may arise from human error, error by third parties, communication errors, or technology failures, among other causes.

Preferred and convertible securities risk. Preferred stock dividends are payable only if declared by the issuer’s board. Preferred stock may be subject to redemption provisions. The market values of convertible securities tend to fall as interest rates rise and rise as interest rates fall. Convertible preferred stock’s value can depend heavily upon the underlying common stock’s value.

Reverse repurchase agreement risk. Reverse repurchase agreement transactions involve the risk that the market value of the securities that the Fund is obligated to repurchase under such agreements may decline below the repurchase price. Any fluctuations in the market value of either the securities transferred to the other party or the securities in which the proceeds may be invested would affect the market value of the fund’s assets, thereby potentially increasing fluctuations in the market value of the fund’s assets. In the event the buyer of securities under a reverse repurchase agreement files for bankruptcy or becomes insolvent, the fund’s use of proceeds received under the agreement may be restricted pending a determination by the other party, or its trustee or receiver, whether to enforce the fund’s obligation to repurchase the securities.

Sector risk. When a fund’s investments are focused in one or more sectors of the economy, they are less broadly invested across industries or sectors than other funds. This means that focused funds tend to be more volatile than other funds, and the values of their investments tend to go up and down more rapidly. In addition, a fund that invests in particular sectors is particularly susceptible to the impact of market, economic, political, regulatory, and other conditions and risks affecting those sectors. From time to time, a small number of companies may represent a large portion of a single sector or a group of related sectors as a whole.

U.S. Government agency obligations risk. U.S. government-sponsored entities such as Federal National Mortgage Association (Fannie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac) and the Federal Home Loan Banks, although chartered or sponsored by Congress, are not funded by congressional appropriations and the debt securities that they issue are neither guaranteed nor issued by the U.S. government. Such debt securities are subject to the risk of default on the payment of interest and/or principal, similar to the debt securities of private issuers. The maximum potential liability of the issuers of some U.S. government obligations may greatly exceed their current resources, including any legal right to support from the U.S. government. Although the U.S. government has provided financial support to Fannie Mae and Freddie Mac in the past, there can be no assurance that it will support these or other government-sponsored entities in the future.

Utilities sector risk. Companies in the utilities sector may be affected by general economic conditions, supply and demand, financing and operating costs, rate caps, interest rates, liabilities arising from governmental or civil actions, consumer confidence and spending, competition, technological progress, energy prices, resource conservation and depletion, man-made or natural disasters, geopolitical events, and environmental and other government regulations. The value of securities issued by companies in the utilities sector may be negatively impacted by variations in exchange rates, domestic and international competition, energy conservation and governmental limitations on rates charged to customers. Although rate changes of a regulated utility usually vary in approximate correlation with financing costs, due to political and regulatory factors rate changes usually happen only after a delay after the changes in financing costs. Deregulation may subject utility companies to increased competition and can negatively affect their profitability as it permits utility companies to diversify outside of their original geographic regions and customary lines of business, causing them to engage in more uncertain ventures. Deregulation can also eliminate restrictions on the profits of certain utility companies, but can simultaneously expose these companies to an increased risk of loss. Although opportunities may permit certain utility companies to earn more than their traditional regulated rates of return, companies in the utilities industry may have difficulty obtaining an adequate return on invested capital, raising capital, or financing large construction projects during periods of inflation or unsettled capital markets. Utility companies may also be subject to increased costs because of the effects of man-made or natural disasters. Current and future regulations or legislation can make it more difficult for utility companies to operate profitably. Government regulators monitor and control utility revenues and costs, and thus may restrict utility profits. There is no assurance that regulatory authorities will grant rate increases in the future, or that those increases will be adequate to permit the payment of dividends on stocks issued by a utility company. Because utility companies are faced with the same obstacles, issues and regulatory burdens, their securities may react similarly and more in unison to these or other market conditions.

Capital Stock, Long-Term Debt, and Other Securities [Abstract]

Outstanding Security, Held [Shares]

49,185,225

Changing distribution level And return of capital risk [Member]