Strategy. To pursue its goal, the fund normally invests at least 80% of its net assets, plus any borrowings for investment purposes, in U.S. dollar and non-U.S. dollar-denominated fixed-income securities of governments and companies located in various countries, including emerging markets. The fund invests principally in bonds, notes (including structured notes), mortgage-related securities, asset-backed securities, floating rate loans (limited to up to 20% of the fund's net assets) and other floating rate securities and Eurodollar and Yankee dollar instruments. The fund generally invests in eight or more countries, but always invests in at least three countries, one of which may be the United States. The fund may invest up to 25% of its assets in emerging markets. At times, the fund … Show more… To pursue its goal, the fund normally invests at least 80% of its net assets, plus any borrowings for investment purposes, in U.S. dollar and non-U.S. dollar-denominated fixed-income securities of governments and companies located in various countries, including emerging markets. The fund invests principally in bonds, notes (including structured notes), mortgage-related securities, asset-backed securities, floating rate loans (limited to up to 20% of the fund's net assets) and other floating rate securities and Eurodollar and Yankee dollar instruments. The fund generally invests in eight or more countries, but always invests in at least three countries, one of which may be the United States. The fund may invest up to 25% of its assets in emerging markets. At times, the fund may invest a substantial part of its assets in any one country. The fund normally invests primarily in fixed-income securities rated, at the time of purchase, investment grade (i.e., Baa/BBB or higher) or, if unrated, determined to be of comparable quality by Insight North America LLC, the fund's sub-adviser. The fund, however, may invest up to 25% of its assets in securities rated, at the time of purchase, below investment grade ("high yield" or "junk" bonds), but not rated lower than B, or, if unrated, determined to be of comparable quality by the fund's sub-adviser. There are no restrictions on the dollar-weighted average maturity or average effective duration of the fund's portfolio or on the maturities or durations of the individual fixed-income securities the fund may purchase. A bond's maturity is the length of time until the principal must be fully repaid with interest. Duration is an indication of an investment's "interest rate risk," or how sensitive a bond or the fund's portfolio may be to changes in interest rates. The fund's sub-adviser focuses on identifying undervalued government bond markets, currencies, sectors and securities and de-emphasizes the use of interest rate forecasting. The sub-adviser looks for fixed-income securities with the potential for credit upgrades, unique structural characteristics or innovative features. The sub-adviser selects securities by using fundamental economic research and quantitative analysis to allocate assets among countries and currencies, and by focusing on sectors and individual securities that appear to be relatively undervalued and actively trading among sectors. The fund typically will sell a security if the fund's sub-adviser believes it is overvalued from a valuation standpoint, another sector becomes relatively more attractive, and/or it expects fundamentals to deteriorate. The fund does not have any limitations regarding portfolio turnover and may engage in short-term trading in seeking to achieve its investment objective. The fund may use derivative instruments as a substitute for investing directly in an underlying asset, to increase returns, to manage market, foreign currency and/or duration or interest rate risks, or as part of a hedging strategy. The derivative instruments in which the fund may invest typically include options, futures, options on futures, forward contracts and swap agreements. The fund will hedge most, but not necessarily all, of its foreign currency exposure to protect the U.S. dollar value of the fund's assets principally by using forward contracts, futures contracts and swap agreements. Show less