Basis of Presentation and Significant Accounting Policies	3 Months Ended
Mar. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, these financial statements contain all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the Company’s financial condition and results of operations. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017. The Company has reclassified certain amounts in prior-period financial statements to conform to the current period's presentation. The Company has reclassified its prior net presentation of purchases and sales of investments by its consolidated sponsored investments products and its consolidated investment product in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2016 to conform with the current year presentation of showing such purchases and sales as separate line items within the cash flows from operating activities. The reclassification had no impact on the net cash provided by or used in operating, investing or financing activities within the Condensed Consolidated Statement of Cash Flows, or any impact on the other Condensed Consolidated Financial Statements. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 filed with the Securities and Exchange Commission. The Company’s significant accounting policies, which have been consistently applied, are summarized in its 2016 Annual Report on Form 10-K. New Accounting Standards Implemented The Company adopted Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09") on January 1, 2017. This standard makes several modifications to the accounting for forfeitures and employer tax withholdings on share-based compensation as well as the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. Upon adoption of this ASU, the Company recorded a $1.1 million cumulative effect adjustment to retained earnings for excess tax benefits that were not previously recognized because the related tax deduction had not reduced current taxes payable. The Company elected to adopt all provisions impacting the Condensed Consolidated Statements of Operations and Cash Flows prospectively and the Company elected to recognize the impact of forfeitures as they occur. The Company adopted ASU 2016-07, Investments—Equity Method and Joint Ventures (Topic 232): Simplifying the Transition to the Equity Method of Accounting, on January 1, 2017. This standard eliminates the requirement that, when an existing cost method investment qualifies for use of the equity method, an investor must restate its historical financial statements, as if the equity method had been used during all previous periods. Under the new guidance, at the point an investment qualifies for the equity method, any unrealized gain or loss in accumulated other comprehensive income/(loss) would be recognized through earnings. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements. New Accounting Standards Not Yet Implemented In November 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-18 requires the inclusion of restricted cash with cash and cash equivalents when reconciling the beginning and ending cash on the statement of cash flows. This standard is effective for annual periods beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2017, including interim periods within that reporting period. Early adoption is permitted in any interim or annual period. A reporting entity should apply this standard on a retrospective basis as of the beginning of the fiscal year for which the standard is effective. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which clarifies the treatment of several cash flow activities. ASU 2016-15 also clarifies that when cash receipts and cash payments have aspects of more than one classification of cash flows and cannot be separated, classification will depend on the predominant source or use. This update is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 was originally effective for fiscal years and interim periods within those years beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09 by one year for periods beginning after December 15, 2017. Adoption of the standard requires either a retrospective or a modified retrospective approach to adoption and early adoption is permitted as of the original effective date. The core principle of the model is that revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received for the goods or services. The guidance also changes the accounting for certain contract costs and revises the criteria for determining if an entity is acting as a principal or agent in certain arrangements. The guidance is effective for the Company beginning January 1, 2018. The Company's implementation assessment includes the identification of revenue within the scope of the guidance, as well as the evaluation of revenue contracts, and it is also evaluating the presentation of certain revenue-related costs on a gross versus net basis and related disclosures of revenue. Although the Company is still evaluating the impact of ASU 2014-09, it has not identified material changes in the timing of revenue recognition. In March 2016, the FASB issued ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net), which amends the principal-versus-agent implementation guidance in ASU 2014-09, Revenue from Contracts with Customers, discussed above. The new guidance will impact whether an entity reports revenue on a gross or net basis. The Company is currently evaluating the potential impact of adopting this standard on its consolidated financial statements, which is effective for the Company in conjunction with the adoption of ASU 2014-09. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). The standard replaces current codification Topic 840 with updated guidance on accounting for leases and requires a lessee to recognize assets and liabilities arising from an operating lease on the balance sheet, whereas previous GAAP rules did not require lease assets and liabilities to be recognized for most leases. Furthermore, this standard permits companies to make an accounting policy election to not recognize lease assets and liabilities for leases with a term of 12 months or less. For both finance leases and operating leases, the lease liability should be initially measured at the present value of the lease payments. The recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee will not significantly change under this new guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and interim periods therein. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements but expects to record a right of use asset and a related lease obligation in the Company's consolidated balance sheet upon adoption. In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which requires all equity investments (other than those accounted for under the equity method) to be measured at fair value with changes in the fair value recognized through net income. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 and interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of this standard on its consolidated financial statements with respect to equity investments that currently report changes in fair value as a component of accumulated other comprehensive income in equity attributable to stockholders. Comprehensive income, net of tax, with respect to these equity investments was $0.2 million for the year ended December 31, 2016. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations: Clarifying the Definition of a Business ("ASU 2017-01"). The standard clarifies the definition of a business and adds guidance to assist entities when evaluating whether transactions should be accounted for as acquisitions or disposals of assets or as businesses. The standard provides a screen to determine whether a set of assets and activities qualifies as a business or as a set of assets. ASU 2017-01 is effective for fiscal years and interim periods within those years beginning after December 15, 2017. The standard requires a prospective approach to adoption, and early adoption is only permitted for specific transactions. The Company is currently evaluating the impact of this standard on its consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment ("ASU 2017-04"). ASU 2017-04 requires that an entity perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity will recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, but the loss cannot exceed the total amount of goodwill allocated to the reporting unit. ASU 2017-04 is effective for fiscal years and interim periods within those years beginning after December 15, 2019. The amendments require a prospective approach to adoption and early adoption is permitted for interim or annual goodwill impairment tests. The Company is currently evaluating the impact of this standard on its consolidated financial statements.

Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, these financial statements contain all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the Company’s financial condition and results of operations. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017.

The Company has reclassified certain amounts in prior-period financial statements to conform to the current period's presentation. The Company has reclassified its prior net presentation of purchases and sales of investments by its consolidated sponsored investments products and its consolidated investment product in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2016 to conform with the current year presentation of showing such purchases and sales as separate line items within the cash flows from operating activities. The reclassification had no impact on the net cash provided by or used in operating, investing or financing activities within the Condensed Consolidated Statement of Cash Flows, or any impact on the other Condensed Consolidated Financial Statements.

These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 filed with the Securities and Exchange Commission. The Company’s significant accounting policies, which have been consistently applied, are summarized in its 2016 Annual Report on Form 10-K.

New Accounting Standards Implemented

The Company adopted Accounting Standards Update ("ASU") 2016-09, Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09") on January 1, 2017. This standard makes several modifications to the accounting for forfeitures and employer tax withholdings on share-based compensation as well as the financial statement presentation of excess tax benefits or deficiencies. ASU 2016-09 also clarifies the statement of cash flows presentation for certain components of share-based awards. Upon adoption of this ASU, the Company recorded a $1.1 million cumulative effect adjustment to retained earnings for excess tax benefits that were not previously recognized because the related tax deduction had not reduced current taxes payable. The Company elected to adopt all provisions impacting the Condensed Consolidated Statements of Operations and Cash Flows prospectively and the Company elected to recognize the impact of forfeitures as they occur.

The Company adopted ASU 2016-07, Investments—Equity Method and Joint Ventures (Topic 232): Simplifying the Transition to the Equity Method of Accounting, on January 1, 2017. This standard eliminates the requirement that, when an existing cost method investment qualifies for use of the equity method, an investor must restate its historical financial statements, as if the equity method had been used during all previous periods. Under the new guidance, at the point an investment qualifies for the equity method, any unrealized gain or loss in accumulated other comprehensive income/(loss) would be recognized through earnings. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

New Accounting Standards Not Yet Implemented

In November 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (“ASU 2016-18”). ASU 2016-18 requires the inclusion of restricted cash with cash and cash equivalents when reconciling the beginning and ending cash on the statement of cash flows. This standard is effective for annual periods beginning after December 15, 2018, and interim periods within fiscal years beginning after December 15, 2017, including interim periods within that reporting period. Early adoption is permitted in any interim or annual period. A reporting entity should apply this standard on a retrospective basis as of the beginning of the fiscal year for which the standard is effective. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"), which clarifies the treatment of several cash flow activities. ASU 2016-15 also clarifies that when cash receipts and cash payments have aspects of more than one classification of cash flows and cannot be separated, classification will depend on the predominant source or use. This update is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers ("ASU 2014-09"), which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. ASU 2014-09 was originally effective for fiscal years and interim periods within those years beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, which deferred the effective date of ASU 2014-09 by one year for periods beginning after December 15, 2017. Adoption of the standard requires either a retrospective or a modified retrospective approach to adoption and early adoption is permitted as of the original effective date. The core principle of the model is that revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received for the goods or services. The guidance also changes the accounting for certain contract costs and revises the criteria for determining if an entity is acting as a principal or agent in certain arrangements. The guidance is effective for the Company beginning January 1, 2018. The Company's implementation assessment includes the identification of revenue within the scope of the guidance, as well as the evaluation of revenue contracts, and it is also evaluating the presentation of certain revenue-related costs on a gross versus net basis and related disclosures of revenue. Although the Company is still evaluating the impact of ASU 2014-09, it has not identified material changes in the timing of revenue recognition.

In March 2016, the FASB issued ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net), which amends the principal-versus-agent implementation guidance in ASU 2014-09, Revenue from Contracts with Customers, discussed above. The new guidance will impact whether an entity reports revenue on a gross or net basis. The Company is currently evaluating the potential impact of adopting this standard on its consolidated financial statements, which is effective for the Company in conjunction with the adoption of ASU 2014-09.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). The standard replaces current codification Topic 840 with updated guidance on accounting for leases and requires a lessee to recognize assets and liabilities arising from an operating lease on the balance sheet, whereas previous GAAP rules did not require lease assets and liabilities to be recognized for most leases. Furthermore, this standard permits companies to make an accounting policy election to not recognize lease assets and liabilities for leases with a term of 12 months or less. For both finance leases and operating leases, the lease liability should be initially measured at the present value of the lease payments. The recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee will not significantly change under this new guidance. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and interim periods therein. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its consolidated financial statements but expects to record a right of use asset and a related lease obligation in the Company's consolidated balance sheet upon adoption.

In January 2016, the FASB issued ASU No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which requires all equity investments (other than those accounted for under the equity method) to be measured at fair value with changes in the fair value recognized through net income. ASU 2016-01 is effective for fiscal years beginning after December 15, 2017 and interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of this standard on its consolidated financial statements with respect to equity investments that currently report changes in fair value as a component of accumulated other comprehensive income in equity attributable to stockholders. Comprehensive income, net of tax, with respect to these equity investments was $0.2 million for the year ended December 31, 2016.

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations: Clarifying the Definition of a Business ("ASU 2017-01"). The standard clarifies the definition of a business and adds guidance to assist entities when evaluating whether transactions should be accounted for as acquisitions or disposals of assets or as businesses. The standard provides a screen to determine whether a set of assets and activities qualifies as a business or as a set of assets. ASU 2017-01 is effective for fiscal years and interim periods within those years beginning after December 15, 2017. The standard requires a prospective approach to adoption, and early adoption is only permitted for specific transactions. The Company is currently evaluating the impact of this standard on its consolidated financial statements.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment ("ASU 2017-04"). ASU 2017-04 requires that an entity perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity will recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value, but the loss cannot exceed the total amount of goodwill allocated to the reporting unit. ASU 2017-04 is effective for fiscal years and interim periods within those years beginning after December 15, 2019. The amendments require a prospective approach to adoption and early adoption is permitted for interim or annual goodwill impairment tests. The Company is currently evaluating the impact of this standard on its consolidated financial statements.