Janus Aspen Series Worldwide Portfolio Supplement dated January 25, 2013 to Currently Effective Prospectuses Effective May 1, 2013, Worldwide Portfolio will change its name to “Global Research Portfolio” and will change its portfolio manager. In addition, the following changes will apply as noted. 2. The following replaces the corresponding information under “Principal Investment Strategies” in the Portfolio Summary section of the Prospectuses for the Portfolio: The Portfolio pursues its investment objective by investing primarily in common stocks selected for their growth potential. The Portfolio may invest in companies of any size located anywhere in the world, from larger, well-established companies to smaller, emerging growth companies. The Portfolio normally invests at least 40% of its net assets in securities of issuers or companies from different countries located throughout the world, excluding the United States. The Portfolio may have significant exposure to emerging markets. The Portfolio may also invest in foreign equity and debt securities. Janus Capital’s equity research analysts, overseen by the Portfolio Oversight Team led by Janus Capital’s Director of Equity Research James P. Goff (the “Research Team”), select investments for the Portfolio which represent the Research Team’s high-conviction investment ideas in all market capitalizations, styles, and geographies. The Research Team, comprised of sector specialists, conducts fundamental analysis with a focus on “bottom up” research, quantitative modeling, and valuation analysis. Using this research process, analysts rate their stocks based upon attractiveness. Analysts bring their high-conviction ideas to their respective sector teams. Sector teams compare the appreciation and risk potential of each of the team’s high-conviction ideas and construct a sector portfolio that is intended to maximize the best risk-reward opportunities. Positions may be sold when, among other things, there is no longer high conviction in the return potential of the investment or if the risk characteristics have caused a re-evaluation of the opportunity. This may occur if the stock has appreciated and reflects the anticipated value, if another company represents a better risk-reward opportunity, or if the investment’s fundamental characteristics deteriorate. Securities may also be sold from the portfolio to rebalance sector weightings. Mr. Goff oversees the investment process and is responsible for the day-to-day management of the Portfolio. It is expected that the Portfolio will be broadly diversified among a variety of industry sectors. The Portfolio intends to be fully invested under normal circumstances. However, under unusual circumstances, if the Research Team does not have high conviction in enough investment opportunities, the Portfolio’s uninvested assets may be held in cash or similar instruments. The Portfolio may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices, as substitutes for securities in which the Portfolio invests. The Portfolio may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment, currency exposure, or market conditions, or to hedge currency exposure relative to the Portfolio’s benchmark index) and to earn income and enhance returns. Please retain this Supplement with your records. |
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| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Registrant Name | dei_EntityRegistrantName | JANUS ASPEN SERIES |
| Prospectus Date | rr_ProspectusDate | May 01, 2012 |
| Supplement [Text Block] | jas2_SupplementTextBlock | Janus Aspen Series Worldwide Portfolio Supplement dated January 25, 2013 to Currently Effective Prospectuses Effective May 1, 2013, Worldwide Portfolio will change its name to “Global Research Portfolio” and will change its portfolio manager. In addition, the following changes will apply as noted. 2. The following replaces the corresponding information under “Principal Investment Strategies” in the Portfolio Summary section of the Prospectuses for the Portfolio: The Portfolio pursues its investment objective by investing primarily in common stocks selected for their growth potential. The Portfolio may invest in companies of any size located anywhere in the world, from larger, well-established companies to smaller, emerging growth companies. The Portfolio normally invests at least 40% of its net assets in securities of issuers or companies from different countries located throughout the world, excluding the United States. The Portfolio may have significant exposure to emerging markets. The Portfolio may also invest in foreign equity and debt securities. Janus Capital’s equity research analysts, overseen by the Portfolio Oversight Team led by Janus Capital’s Director of Equity Research James P. Goff (the “Research Team”), select investments for the Portfolio which represent the Research Team’s high-conviction investment ideas in all market capitalizations, styles, and geographies. The Research Team, comprised of sector specialists, conducts fundamental analysis with a focus on “bottom up” research, quantitative modeling, and valuation analysis. Using this research process, analysts rate their stocks based upon attractiveness. Analysts bring their high-conviction ideas to their respective sector teams. Sector teams compare the appreciation and risk potential of each of the team’s high-conviction ideas and construct a sector portfolio that is intended to maximize the best risk-reward opportunities. Positions may be sold when, among other things, there is no longer high conviction in the return potential of the investment or if the risk characteristics have caused a re-evaluation of the opportunity. This may occur if the stock has appreciated and reflects the anticipated value, if another company represents a better risk-reward opportunity, or if the investment’s fundamental characteristics deteriorate. Securities may also be sold from the portfolio to rebalance sector weightings. Mr. Goff oversees the investment process and is responsible for the day-to-day management of the Portfolio. It is expected that the Portfolio will be broadly diversified among a variety of industry sectors. The Portfolio intends to be fully invested under normal circumstances. However, under unusual circumstances, if the Research Team does not have high conviction in enough investment opportunities, the Portfolio’s uninvested assets may be held in cash or similar instruments. The Portfolio may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices, as substitutes for securities in which the Portfolio invests. The Portfolio may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment, currency exposure, or market conditions, or to hedge currency exposure relative to the Portfolio’s benchmark index) and to earn income and enhance returns. Please retain this Supplement with your records. |
|
Worldwide Portfolio | Service Shares
|
||
| Risk/Return: | rr_RiskReturnAbstract | |
| Supplement [Text Block] | jas2_SupplementTextBlock | Janus Aspen Series Worldwide Portfolio Supplement dated January 25, 2013 to Currently Effective Prospectuses Effective May 1, 2013, Worldwide Portfolio will change its name to “Global Research Portfolio” and will change its portfolio manager. In addition, the following changes will apply as noted. 2. The following replaces the corresponding information under “Principal Investment Strategies” in the Portfolio Summary section of the Prospectuses for the Portfolio: The Portfolio pursues its investment objective by investing primarily in common stocks selected for their growth potential. The Portfolio may invest in companies of any size located anywhere in the world, from larger, well-established companies to smaller, emerging growth companies. The Portfolio normally invests at least 40% of its net assets in securities of issuers or companies from different countries located throughout the world, excluding the United States. The Portfolio may have significant exposure to emerging markets. The Portfolio may also invest in foreign equity and debt securities. Janus Capital’s equity research analysts, overseen by the Portfolio Oversight Team led by Janus Capital’s Director of Equity Research James P. Goff (the “Research Team”), select investments for the Portfolio which represent the Research Team’s high-conviction investment ideas in all market capitalizations, styles, and geographies. The Research Team, comprised of sector specialists, conducts fundamental analysis with a focus on “bottom up” research, quantitative modeling, and valuation analysis. Using this research process, analysts rate their stocks based upon attractiveness. Analysts bring their high-conviction ideas to their respective sector teams. Sector teams compare the appreciation and risk potential of each of the team’s high-conviction ideas and construct a sector portfolio that is intended to maximize the best risk-reward opportunities. Positions may be sold when, among other things, there is no longer high conviction in the return potential of the investment or if the risk characteristics have caused a re-evaluation of the opportunity. This may occur if the stock has appreciated and reflects the anticipated value, if another company represents a better risk-reward opportunity, or if the investment’s fundamental characteristics deteriorate. Securities may also be sold from the portfolio to rebalance sector weightings. Mr. Goff oversees the investment process and is responsible for the day-to-day management of the Portfolio. It is expected that the Portfolio will be broadly diversified among a variety of industry sectors. The Portfolio intends to be fully invested under normal circumstances. However, under unusual circumstances, if the Research Team does not have high conviction in enough investment opportunities, the Portfolio’s uninvested assets may be held in cash or similar instruments. The Portfolio may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices, as substitutes for securities in which the Portfolio invests. The Portfolio may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment, currency exposure, or market conditions, or to hedge currency exposure relative to the Portfolio’s benchmark index) and to earn income and enhance returns. Please retain this Supplement with your records. |
|
Worldwide Portfolio | Institutional Shares
|
||
| Risk/Return: | rr_RiskReturnAbstract | |
| Supplement [Text Block] | jas2_SupplementTextBlock | Janus Aspen Series Worldwide Portfolio Supplement dated January 25, 2013 to Currently Effective Prospectuses Effective May 1, 2013, Worldwide Portfolio will change its name to “Global Research Portfolio” and will change its portfolio manager. In addition, the following changes will apply as noted. 2. The following replaces the corresponding information under “Principal Investment Strategies” in the Portfolio Summary section of the Prospectuses for the Portfolio: The Portfolio pursues its investment objective by investing primarily in common stocks selected for their growth potential. The Portfolio may invest in companies of any size located anywhere in the world, from larger, well-established companies to smaller, emerging growth companies. The Portfolio normally invests at least 40% of its net assets in securities of issuers or companies from different countries located throughout the world, excluding the United States. The Portfolio may have significant exposure to emerging markets. The Portfolio may also invest in foreign equity and debt securities. Janus Capital’s equity research analysts, overseen by the Portfolio Oversight Team led by Janus Capital’s Director of Equity Research James P. Goff (the “Research Team”), select investments for the Portfolio which represent the Research Team’s high-conviction investment ideas in all market capitalizations, styles, and geographies. The Research Team, comprised of sector specialists, conducts fundamental analysis with a focus on “bottom up” research, quantitative modeling, and valuation analysis. Using this research process, analysts rate their stocks based upon attractiveness. Analysts bring their high-conviction ideas to their respective sector teams. Sector teams compare the appreciation and risk potential of each of the team’s high-conviction ideas and construct a sector portfolio that is intended to maximize the best risk-reward opportunities. Positions may be sold when, among other things, there is no longer high conviction in the return potential of the investment or if the risk characteristics have caused a re-evaluation of the opportunity. This may occur if the stock has appreciated and reflects the anticipated value, if another company represents a better risk-reward opportunity, or if the investment’s fundamental characteristics deteriorate. Securities may also be sold from the portfolio to rebalance sector weightings. Mr. Goff oversees the investment process and is responsible for the day-to-day management of the Portfolio. It is expected that the Portfolio will be broadly diversified among a variety of industry sectors. The Portfolio intends to be fully invested under normal circumstances. However, under unusual circumstances, if the Research Team does not have high conviction in enough investment opportunities, the Portfolio’s uninvested assets may be held in cash or similar instruments. The Portfolio may invest its assets in derivatives, which are instruments that have a value derived from, or directly linked to, an underlying asset, such as equity securities, fixed-income securities, commodities, currencies, interest rates, or market indices, as substitutes for securities in which the Portfolio invests. The Portfolio may invest in derivative instruments (by taking long and/or short positions) for different purposes, including hedging (to offset risks associated with an investment, currency exposure, or market conditions, or to hedge currency exposure relative to the Portfolio’s benchmark index) and to earn income and enhance returns. Please retain this Supplement with your records. |
|
Document and Entity Information
|
12 Months Ended |
|---|---|
|
Jan. 25, 2013
|
|
| Risk/Return: | |
| Document Type | Other |
| Document Period End Date | Dec. 31, 2011 |
| Registrant Name | JANUS ASPEN SERIES |
| Central Index Key | 0000906185 |
| Amendment Flag | false |
| Document Creation Date | Jan. 25, 2013 |
| Document Effective Date | May 01, 2013 |
| Prospectus Date | May 01, 2012 |
| Label | Element | Value |
|---|---|---|
| Risk/Return: | rr_RiskReturnAbstract | |
| Registrant Name | dei_EntityRegistrantName | JANUS ASPEN SERIES |
| Prospectus Date | rr_ProspectusDate | May 01, 2012 |
| Document Creation Date | dei_DocumentCreationDate | Jan. 25, 2013 |