2.2.0.25falsefalse1010 - Disclosure - DESCRIPTION OF THE BUSINESStruefalsefalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $D2010http://www.sec.gov/CIK0001065865duration2010-01-01T00:00:002010-12-31T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDPerShareDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0USDUSD$2true0jns_DescriptionOfBusinessDisclosureAbstractjnsfalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseDESCRIPTION OF THE BUSINESS3false0us-gaap_NatureOfOperationsus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00<table style="font-size:10pt; font-family:'Times New Roman',times,serif;"> <tr> <td> <table style="FONT-SIZE: 10pt; FONT-FAMILY: 'Times New Roman',times,serif"> <tr> <td> NOTE 1  DESCRIPTION OF THE BUSINESS Janus Capital Group Inc. and its subsidiaries (collectively, "JCG" or the "Company") derive revenue and net income from providing investment management, administration, distribution and related services to individual and institutional investors through mutual funds, separate accounts and subadvised relationships (collectively referred to as "investment products") in both domestic and international markets. Revenues are generally based upon a percentage of the market value of assets under management and are calculated as a percentage of the daily average asset balance in accordance with contractual agreements with the Company's investment products or clients. Certain investment products are also subject to performance fees which vary based on a product's relative performance as compared to a benchmark index and the level of assets subject to such fees. Assets under management primarily consist of domestic and international equity and debt securities. Accordingly, fluctuations in domestic and international financial markets, relative investment performance, sales and redemptions of investment products, and changes in the composition of assets under management are all factors that have a direct effect on JCG's operating results. A significant portion of JCG's revenue is derived from contracts to manage mutual funds, which are subject to annual review and approval by each fund's Board of Trustees and/or its shareholders. JCG's significant subsidiaries at December 31, 2010, include: <dl compact="compact"> <dt> </dt> <dt style="MARGIN-BOTTOM: -11pt; FONT-FAMILY: times"> </dt> <dd style="FONT-FAMILY: times">Janus Capital Management LLC ("Janus"), (wholly-owned subsidiary).  Janus offers growth and core equity, global and international equity, as well as balanced, fixed income and retail money market investment products. </dd> <dt style="MARGIN-BOTTOM: -11pt; FONT-FAMILY: times"> </dt> <dd style="FONT-FAMILY: times">INTECH Investment Management LLC ("INTECH"), (approximate 95% owned subsidiary). INTECH offers risk-managed investment products that are based on a mathematical theorem that seeks to add value for clients by capitalizing on the volatility in stock price movements. INTECH's goal is to achieve long-term returns that outperform a specified benchmark index, while controlling risks and trading costs. INTECH manages institutional and private accounts and subadvises certain Janus mutual funds. </dd> <dt style="MARGIN-BOTTOM: -11pt; FONT-FAMILY: times"> </dt> <dd style="FONT-FAMILY: times">Perkins Investment Management LLC ("Perkins"), (approximate 78% owned subsidiary). Perkins offers value-disciplined investment products, including small, mid and large cap and global value investment products.</dd></dl></td></tr></table></td></tr></table> NOTE 1  DESCRIPTION OF THE BUSINESS Janus Capital Group Inc. and its subsidiaries (collectively, "JCG" or the "Company") derive revenue andfalsefalsefalsefalsefalseOtherus-types:textBlockItemTypestringDescribes the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Disclosures about the nature of operations need not be quantified; relative importance could be conveyed by use of terms such as "predominately", "about equally", or "major and other". This element is also referred to as "Business Description".Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 10 falsefalseDESCRIPTION OF THE BUSINESS12DESCRIPTION OF THE BUSINESSUnKnownUnKnownUnKnownUnKnownfalsetrue