| N-2 | 6 Months Ended |
| Apr. 30, 2023 shares | |
| Cover [Abstract] | |
| Entity Central Index Key | 0001219120 |
| Amendment Flag | false |
| Document Type | N-CSRS |
| Entity Registrant Name | Advent Convertible and Income Fund |
| General Description of Registrant [Abstract] | |
| Investment Objectives and Practices [Text Block] | The Fund’s investment objective is to provide total return through a combination of capital appreciation and current income. Under normal market conditions, the Fund will invest at least 80% of its managed assets in a diversified portfolio of convertible securities and non-convertible income securities. Under normal market conditions, the Fund will invest at least 30% of its managed assets in convertible securities and up to 70% of its managed assets in non-convertible income securities. The Fund may invest without limitation in securities of foreign issuers. |
| Risk [Text Block] | Investors should consider the following risk factors and special considerations associated with investing in the Fund. Investors should be aware that in light of the current uncertainty, volatility and distress in economies, financial markets, and labor and health conditions over the world, the risks below are heightened significantly compared to normal conditions and therefore subject the Fund’s investments and a shareholder’s investment in the Fund to elevated investment risk, including the possible loss of the entire principal amount invested. Investment and Market Risk. Market Discount Risk. shares, general market and economic conditions and other factors beyond the control of the Fund, the Fund cannot predict whether common shares will trade at, below or above net asset value or at, below or above an investor’s initial purchase price for common shares. Convertible Securities Risk. The market value of a convertible security is a function of its “investment value” and its “conversion value.” A security’s “investment value” represents the value of the security without its conversion feature (i.e., a nonconvertible fixed income security). The investment value may be determined by reference to its credit quality and the current value of its yield to maturity or probable call date. At any given time, investment value is dependent upon such factors as the general level of interest rates, the yield of similar nonconvertible securities, the financial strength of the issuer, and the seniority of the security in the issuer’s capital structure. A security’s “conversion value” is determined by multiplying the number of shares the holder is entitled to receive upon conversion or exchange by the current price of the underlying security. If the conversion value of a convertible security is significantly below its investment value, the convertible security will trade like nonconvertible debt or preferred stock and its market value will not be influenced greatly by fluctuations in the market price of the underlying security. In that circumstance, the convertible security takes on the characteristics of a bond, and its price moves in the opposite direction from interest rates. Conversely, if the conversion value of a convertible security is near or above its investment value, the market value of the convertible security will be more heavily influenced by fluctuations in the market price of the underlying security. In that case, the convertible security’s price may be as volatile as that of common stock. Because both interest rates and market movements can influence its value, a convertible security generally is not as sensitive to interest rates as a similar fixed income security, nor is it as sensitive to changes in share price as its underlying equity security. Convertible securities are often rated below investment grade or are not rated. Although all markets are prone to change over time, the generally high rate at which convertible securities are retired (through mandatory or scheduled conversions by issuers or through voluntary redemptions by holders) and replaced with newly issued convertibles may cause the convertible securities market to change more rapidly than other markets. For example, a concentration of available convertible securities in a few economic sectors could elevate the sensitivity of the convertible securities market to the volatility of the equity markets and to the specific risks of those sectors. Moreover, convertible securities with innovative structures, such as mandatory-conversion securities and equity-linked securities, have increased the sensitivity of the convertible securities market to the volatility of the equity markets and to the special risks of those innovations, which may include risks different from, and possibly greater than, those associated with traditional convertible securities. A convertible security may be subject to redemption at the option of the issuer at a price set in the governing instrument of the convertible security. If a convertible security held by the Fund is subject to such redemption option and is called for redemption, the Fund must allow the issuer to redeem the security, convert it into the underlying common stock, or sell the security to a third party. As a result of the conversion feature, convertible securities typically offer lower interest rates than if the securities were not convertible. During periods of rising interest rates, it is possible that the potential for capital gain on convertible securities may be less than that of a common stock equivalent if the yield on the convertible security is at a level that would cause it to sell at a discount. Also, in the absence of adequate anti-dilution provisions in a convertible security, dilution in the value of the Fund’s holding may occur in the event the underlying stock is subdivided, additional securities are issued, a stock dividend is declared, or the issuer enters into another type of corporate transaction which increases its outstanding securities. Structured and Synthetic Convertible Securities Risk. Equity Securities Risk. Interest Rate Risk. • If interest rates go up, the value of income securities in the Fund’s portfolio generally will decline. These risks may be greater in the current market environment because while interest rates were historically low in past years, the Fed has been increasing the Federal Funds rate to address inflation. • During periods of rising interest rates, the average life of certain types of income securities may be extended because of slower than expected principal payments. This may lock in a below market interest rate, increase the security’s duration (the estimated period until the security is paid in full) and reduce the value of the security. This is known as extension risk. • During periods of declining interest rates, the issuer of an income security may exercise its option to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding income securities. This is known as call or prepayment risk. Lower grade income securities have call features that allow the issuer to repurchase the security prior to its stated maturity. An issuer may redeem a lower grade income security if the issuer can refinance the security at a lower cost due to declining interest rates or an improvement in the credit standing of the issuer. • Interest rate risk may be more pronounced in the current market environment with interest rates rising in response to inflation. Credit Risk. Lower Grade Securities Risk. Debt Securities Risk. country risk and currency risk. The reorganization of an issuer under the federal bankruptcy laws may result in the issuer’s debt securities being cancelled without repayment, repaid only in part, or repaid in part or in whole through an exchange thereof for any combination of cash, debt securities, convertible securities, equity securities, or other instruments or rights in respect of the same issuer or a related entity. Preferred Securities Risk. Deferral. Non-Cumulative Dividends. Subordination. Liquidity. Limited Voting Rights. Special Redemption Rights. Foreign Securities Risk. Furthermore, issuers of foreign securities and obligations are subject to different, often less comprehensive, accounting, reporting and disclosure requirements than domestic issuers. The securities and obligations of some foreign companies and foreign markets are less liquid and at times more volatile than comparable U.S. securities, obligations and markets. Securities markets in foreign countries often are not as developed, efficient or liquid as securities markets in the United States, and therefore, the prices of foreign securities can be more volatile. Certain foreign countries may impose restrictions on the ability of issuers to make payments of principal and interest to investors located outside the country. In the event of nationalization, expropriation or other confiscation, the Fund could lose its entire investment in a foreign security. Transaction costs of investing outside the U.S. are generally higher than in the U.S. Higher costs result because of the cost of converting a foreign currency to dollars, the payment of fixed brokerage commissions on some foreign exchanges and the imposition of transfer taxes or transaction charges by foreign exchanges. Non-U.S. markets also have different clearance and settlement procedures which in some markets have at times failed to keep pace with the volume of transactions, thereby creating substantial delays and settlement failures that could adversely affect the Fund’s performance. Foreign brokerage commissions and other fees are also generally higher than in the United States. There are also special tax considerations which apply to securities and obligations of foreign issuers and securities and obligations principally traded overseas. These risks may be more pronounced to the extent that the Fund invests a significant amount of its assets in companies located in one country or geographic region, in which case the Fund may be more exposed to regional economic risks, and to the extent that the Fund invests in securities of issuers in emerging markets. On January 31, 2020, the United Kingdom (“UK”) officially withdrew from the European Union (“EU”). Following a transition period, the United Kingdom and the EU signed a Trade and Cooperation Agreement (“UK/EU Trade Agreement”), which came into full force on May 1, 2021 and set out the foundation of the economic and legal framework for trade between the United Kingdom and the EU. As the UK/EU Trade Agreement is a new legal framework, the implementation of the UK/EU Trade Agreement may result in uncertainty in its application and periods of volatility in both the UK and wider European markets. The UK’s exit from the EU (“Brexit”) is expected to result in additional trade costs and disruptions in this trading relationship. Furthermore, there is the possibility that either party may impose tariffs on trade in the future in the event that regulatory standards between the EU and the UK diverge. The terms of the future relationship may cause continued uncertainty in the global financial markets, and adversely affect the performance of the Fund. In addition to the effects on the Fund’s investments in European issuers, the unavoidable uncertainties and events related to Brexit could negatively affect the value and liquidity of the Fund’s other investments, increase taxes and costs of business and cause volatility in currency exchange rates and interest rates. European, UK or worldwide political, regulatory, economic or market conditions and could contribute to instability in political institutions, regulatory agencies and financial markets. Brexit could also lead to legal uncertainty and politically divergent national laws and regulations as the new relationship between the UK and EU is further defined and as the UK determines which EU laws to replace or replicate. In addition, Brexit could lead to further disintegration of the EU and related political stresses (including those related to sentiment against cross border capital movements and activities of investors like the Fund), prejudice to financial services businesses that are conducting business in the EU and which are based in the UK, legal uncertainty regarding achievement of compliance with applicable financial and commercial laws and regulations in view of the expected steps to be taken pursuant to or in contemplation of Brexit. Any of these effects of Brexit, and others that cannot be anticipated, could adversely affect the Fund’s business, results of operations and financial condition. Emerging Markets Risk. Investments in issuers located in emerging markets pose a greater degree of systemic risk. The inter-relatedness of institutions within a country and among emerging market economies has increased in recent years. Institutional failures or economic difficulties may spread throughout a country, region or emerging market countries throughout the world, which may limit the ability of the Fund to manage risk through geographic diversification. Bankruptcy law and creditor reorganization processes may differ substantially from those in the United States, resulting in greater uncertainty as to the rights of creditors, the enforceability of such rights, reorganization timing and the classification, seniority and treatment of claims. Foreign Currency Risk. CLO Risk CLOs often involve risks that are different from or more acute than risks associated with other types of income securities, including: (1) the possibility that distributions from collateral assets will not be adequate to make interest or other payments; (2) the quality of the collateral may decline in value or default; (3) investments in CLO junior debt tranches and CLO subordinated notes will likely be subordinate in right of payment to other senior classes of CLO debt; and (4) the complex structure of a particular security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results. There may be less information available to the Fund regarding the underlying investments held by CLOs than if the Fund had invested directly in securities of the underlying issuers. Fund shareholders will not know the details of the underlying investments of the CLOs in which the Fund invests. Due to their often complicated structures, various CLOs may be difficult to value and may constitute illiquid investments. In addition, there can be no assurance that a liquid market will exist in any CLO when the Fund seeks to sell its interest therein. Moreover, the value of CLOs may decrease if the ratings agencies reviewing such securities revise their ratings criteria and, as a result, lower their original rating of a CLO in which the Fund has invested. Further, the complex structure of the security may produce unexpected investment results. Also, it is possible that the Fund’s investment in a CLO will be subject to certain contractual limitations on transfer. The market value of CLO securities may be affected by, among other things, changes in the market value of the underlying assets held by the CLOs, changes in the distributions on the underlying assets, defaults and recoveries on the underlying assets, capital gains and losses on the underlying assets, prepayments on underlying assets and the availability, prices and interest rate of underlying assets. Therefore, changes in the market value of the Fund’s CLO investments could be greater than the change in the market value of the underlying instruments. As a result, as an investor in a CLO, the Fund is subject to the risk of default by borrowers on the loans held by the CLO. The Federal Reserve has recently implemented several increases to the Federal Funds rate and may in the future implement additional rate increases. Increases in interest rates may adversely impact the ability of borrowers to meet interest payment obligations on loans held by a CLO and increase the likelihood of default. A downturn in any particular industry or borrower in which a CLO is heavily invested may subject that vehicle, and in turn the Fund, to a risk of significant loss and could significantly impact the aggregate returns realized by the Fund. Although a CLO’s holdings are typically diversified by industry and borrower, an increase in interest rates coupled with a general economic downturn may result in an increase in defaults on loans across various sectors of the economy. Investments in primary issuances of CLO securities may involve certain additional risks. Between the pricing date and the effective date of a CLO, the CLO collateral manager will generally expect to purchase additional collateral obligations for the CLO. During this period, the price and availability of these collateral obligations may be adversely affected by a number of market factors, including price volatility and availability of investments suitable for the CLO, which could hamper the ability of the collateral manager to acquire a portfolio of collateral obligations that will satisfy specified concentration limitations and allow the CLO to reach the target initial par amount of collateral prior to the effective date. An inability or delay in reaching the target initial par amount of collateral may adversely affect the timing and amount of interest or principal payments received by the holders of the CLO debt securities and distributions on the CLO subordinated notes and could result in early redemptions which may cause CLO debt and subordinated note investors to receive less than face value of their investment. The failure by a CLO to satisfy financial covenants, including with respect to adequate collateralization and/or interest coverage tests, could lead to a reduction in its payments to securityholders, including the Fund. In the event that a CLO fails certain tests, holders of CLO senior debt may be entitled to additional payments that would, in turn, reduce the payments that holders of junior debt and subordinated securities would otherwise be entitled to receive. In recent years there has been a marked increase in the number of, and flow of capital into, investment vehicles established to pursue investments in CLO securities whereas the size of this market is relatively limited. Such increase may result in greater competition for investment opportunities, which may result in an increase in the price of such investments relative to the risk taken on by holders of such investments. In addition, the volume of new CLO issuances varies over time as a result of a variety of factors including new regulations, changes in interest rates, and other market forces. Such competition may also result under certain circumstances in increased price volatility or decreased liquidity with respect to certain positions. CLO Management Risk. realization of any investment, or other decisions regarding the business and affairs, of that CLO. Consequently, the success of any CLOs in which the Fund invests will depend, in large part, on the financial and managerial expertise of the collateral manager’s investment professionals. Subject to certain exceptions, any change in the investment professionals of the collateral manager will not present grounds for termination of the collateral management agreement. In addition, such investment professionals may not devote all of their professional time to the affairs of the CLOs in which the Fund invests. There can be no assurance that for any CLO, in the event that underlying instruments are prepaid, the collateral manager will be able to reinvest such proceeds in new instruments with equivalent investment returns. If the collateral manager cannot reinvest in new instruments with equivalent investment returns, the interest proceeds available to pay interest on the CLO securities may be adversely affected. The transaction documents relating to the issuance of CLO securities may impose eligibility criteria on the assets of the CLO, restrict the ability of the CLO’s investment manager to trade investments and impose certain portfolio-wide asset quality requirements. These criteria, restrictions and requirements may limit the ability of the CLO’s investment manager to maximize returns on the CLO securities. In addition, other parties involved in CLOs, such as third-party credit enhancers and investors in the rated tranches, may impose requirements that have an adverse effect on the returns of the various tranches of CLO securities. Furthermore, CLO securities issuance transaction documents generally contain provisions that, in the event that certain tests are not met (generally interest coverage and over-collateralization tests at varying levels in the capital structure), proceeds that would otherwise be distributed to holders of a junior tranche must be diverted to pay down the senior tranches until such tests are satisfied. Failure (or increased likelihood of failure) of a CLO to make timely payments on a particular tranche will have an adverse effect on the liquidity and market value of such tranche. The manager of a CLO has broad authority to direct and supervise the investment and reinvestment of the investments held by the CLO, which may include the execution of amendments, waivers, modifications and other changes to the investment documentation in accordance with the collateral management agreement. During periods of economic uncertainty and recession, the incidence of amendments, waivers, modifications and restructurings of investments may increase. Such amendments, waivers, modifications and other restructurings will change the terms of the investments and in some cases may result in the CLO holding assets not meeting the CLO’s criteria for investments. This could adversely impact the coverage tests under an indenture governing the notes issued by the CLO. Any amendment, waiver, modification or other restructuring that reduces the CLO’s compliance with certain financial tests will make it more likely that the CLO will need to utilize cash to pay down the unpaid principal amount of secured notes to cure any breach in such test instead of making payments on subordinated notes. Any such use of cash would reduce distributions available and delay the timing of payments to the Fund. The Fund cannot be certain that any particular restructuring strategy pursued by the CLO manager will maximize the value of or recovery on any investment. Any restructuring can fundamentally alter the nature of the related investment, and restructurings are not subject to the same underwriting standards that are employed in connection with the origination or acquisition of investments. Any restructuring could alter, reduce or delay the payment of interest or principal on any investment, which could delay the timing and reduce the amount of payments made to the Fund. Restructurings of investments might also result in extensions of the term thereof, which could delay the timing of payments made to the Fund. The CLOs in which the Fund invests are generally not registered as investment companies under the 1940 Act. As investors in these CLOs, the Fund is not afforded the protections that shareholders in an investment company registered under the 1940 Act would have. The terms of CLOs set forth in their applicable transaction documents, including with respect to collateralization and/or interest coverage tests and asset eligibility criteria, may vary from CLO to CLO. Similarly the terms of the loans that constitute the underlying assets held by CLOs may vary. The CLO market and loan market may evolve in ways that result in typical terms being less protective for the holders of CLO securities. As a result, the Fund will be reliant upon the Adviser’s ability to obtain and evaluate the terms of the CLOs in which the Fund invests, the terms of and creditworthiness of the borrowers with respect to the underlying assets held by those CLOs and information about the collateral managers of the CLOs. Derivatives Transactions Risk. Risk Associated with Covered Call Option Writing. causing a given transaction not to achieve its objectives. A decision as to whether, when and how to use options involves the exercise of skill and judgment, and even a well-conceived transaction may be unsuccessful to some degree because of market behavior or unexpected events. As the writer of a covered call option, the Fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the security covering the call option above the sum of the premium and the strike price of the call, but has retained the risk of loss should the price of the underlying security decline. As the Fund writes covered calls over more of its portfolio, its ability to benefit from capital appreciation becomes more limited. The value of options written by the Fund will be affected by, among other factors, changes in the value of underlying securities (including those comprising an index), changes in the dividend rates of underlying securities, changes in interest rates, changes in the actual or perceived volatility of the stock market and underlying securities and the remaining time to an option’s expiration. The value of an option also may be adversely affected if the market for the option is reduced or becomes less liquid. To the extent that there is a lack of correlation between the index options written by the Fund and the Fund’s portfolio securities, movements in the indexes underlying the options positions may result in losses to the Fund, which may more than offset any gains received by the Fund from options premiums. Such sales would involve transaction costs borne by the Fund and may also result in realization of taxable gains. With respect to exchange-traded options, there can be no assurance that a liquid market will exist when the Fund seeks to close out an option position on an options exchange. An absence of a liquid secondary market on an exchange may arise because: (i) there may be insufficient trading interest in certain options; (ii) restrictions may be imposed by an exchange on opening transactions or closing transactions or both; (iii) trading halts, suspensions or other restrictions may be imposed with respect to particular classes or series of options; (iv) unusual or unforeseen circumstances may interrupt normal operations on an exchange; (v) the facilities of an exchange or The Options Clearing Corporation (the “OCC”) may not at all times be adequate to handle current trading volume; or (vi) one or more exchanges could, for economic or other reasons, decide or be compelled at some future date to discontinue the trading of options (or a particular class or series of options). If trading were discontinued, the secondary market on that exchange (or in that class or series of options) would cease to exist. In the event that the Fund were unable to close out a call option that it had written on a portfolio security, it would not be able to sell the underlying security unless the option expired without exercise. The Fund’s options transactions will be subject to limitations established by each of the exchanges, boards of trade or other trading facilities on which the options are traded. These limitations govern the maximum number of options in each class which may be written or purchased by a single investor or group of investors acting in concert, regardless of whether the options are written or purchased on the same or different exchanges, boards of trade or other trading facilities or are held or written in one or more accounts or through one or more brokers. An exchange, board of trade or other trading facility may order the liquidation of positions found to be in excess of these limits, and it may impose other sanctions. The Fund may also write (sell) over-the-counter options (“OTC options”). Options written by the Fund with respect to non-U.S. securities, indices or sectors generally will be OTC options. OTC options differ from exchange-listed options in that they are entered into directly with the buyer of the option and not through an exchange or clearing organization that is interposed between the Fund and the counterparty. In an OTC option transaction exercise price, premium and other terms are negotiated between buyer and seller. OTC options generally do not have as much market liquidity as exchange-listed options. The OTC options written by the Fund will not be issued, guaranteed or cleared by the OCC. In addition, the Fund’s ability to terminate the OTC options may be more limited than with exchange-traded options. Banks, broker-dealers or other financial institutions participating in such transaction may fail to settle a transaction in accordance with the terms of the option as written. In the event of default or insolvency of the counterparty, the Fund may be unable to liquidate an OTC option position. Counterparty Risk. Leverage Risk. The use of leverage by the Fund will cause the net asset value, and possibly the market price, of the Fund’s common shares to fluctuate significantly in response to changes in interest rates and other economic indicators. As a result, the net asset value and market price and dividend rate of the common shares of the Fund is likely to be more volatile than those of a closed-end management investment company that is not exposed to leverage. In a declining market the use of leverage may result in a greater decline in the net asset value of the common shares than if the Fund were not leveraged. Leverage will increase operating costs, which may reduce total return. The Fund will have to pay interest on its indebtedness, if any, which may reduce the Fund’s return. This interest expense may be greater than the Fund’s return on the underlying investment, which would negatively affect the performance of the Fund. Increases in interest rates that the Fund must pay on its indebtedness will increase the cost of leverage and may reduce the return to common shareholders. This risk may be greater in the current market environment because while interest rates were historically low in recent years, the Fed has been increasing the Federal Funds rate to address inflation. Certain types of indebtedness subject the Fund to covenants in credit agreements relating to asset coverage and portfolio composition requirements. Certain indebtedness issued by the Fund also may be subject to certain restrictions on investments imposed by guidelines of one or more rating agencies, which may issue ratings for such indebtedness. These guidelines may impose asset coverage or portfolio composition requirements that are more stringent than those imposed by the 1940 Act. It is not anticipated that these guidelines will impede the Investment Adviser from managing the Fund’s portfolio in accordance with the Fund’s investment objective and policies. However, particularly during periods of adverse or volatile market conditions, the Fund may be required to sell assets in order to meet payment obligations on any leverage or to redeem leverage in order to comply with asset coverage or portfolio composition requirements. Reverse repurchase agreements involve the risks that the interest income earned on the investment of the proceeds will be less than the interest expense and Fund expenses associated with the repurchase agreement, that the market value of the securities sold by the Fund may decline below the price at which the Fund is obligated to repurchase such securities and that the securities may not be returned to the Fund. There is no assurance that reverse repurchase agreements can be successfully employed. In connection with reverse repurchase agreements, the Fund will also be subject to counterparty risk with respect to the purchaser of the securities. If the broker/dealer to whom the Fund sells securities becomes insolvent, the Fund’s right to purchase or repurchase securities may be restricted The Fund may have leverage outstanding during a shorter-term period during which such leverage may not be beneficial to the Fund if the Fund believes that the long-term benefits to common shareholders of such leverage would outweigh the costs and portfolio disruptions associated with redeeming and reissuing such leverage. However, there can be no assurance that the Fund’s judgment in weighing such costs and benefits will be correct. During the time in which the Fund is utilizing leverage, the amount of the fees paid for investment advisory services will be higher than if the Fund did not utilize leverage because the fees paid will be calculated based on the Fund’s managed assets, including proceeds of leverage. This may create a conflict of interest between the manager and the common shareholders, as common shareholders bear the portion of the investment advisory fee attributable to the assets purchased with the proceeds of leverage, which means that common shareholders effectively bear the entire advisory fee. In addition, the Fund may engage in certain derivatives transactions that have economic characteristics similar to leverage. The Fund has adopted a derivatives risk management program which includes value-at-risk modeling, stress tests, backtests, and additional disclosures to the SEC in compliance with Rule 18f-4 under the 1940 Act. The requirements of the rule and the Fund’s derivatives risk management program may restrict the Fund’s ability to engage in certain derivatives transactions and/or increase the cost of such transactions, which could adversely affect the performance of the Fund. Illiquid Investments Risk. S |
| Latest Premium (Discount) to NAV [Percent] | (4.70%) |
| Capital Stock, Long-Term Debt, and Other Securities [Abstract] | |
| Outstanding Security, Authorized [Shares] | 34,593,769 |
