THE COMPANY AND BASIS OF PREPARATION.	9 Months Ended
THE COMPANY AND BASIS OF PREPARATION.	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
THE COMPANY AND BASIS OF PREPARATION	THE COMPANY AND BASIS OF PREPARATION. T. Rowe Price Group Inc. derives its consolidated revenues and net income primarily from investment advisory services that its subsidiaries provide to individual and institutional investors in the T. Rowe Price U.S. mutual funds (“U.S. mutual funds”), separately managed accounts, subadvised funds, and other T. Rowe Price products. We also provide certain investment advisory clients with related administrative services, including distribution, mutual fund transfer agent, accounting, and shareholder services; participant recordkeeping and transfer agent services for defined contribution retirement plans; brokerage; and trust services. Investment advisory revenues depend largely on the total value and composition of assets under our management. Accordingly, fluctuations in financial markets and in the composition of assets under management impact our revenues and results of operations. BASIS OF PRESENTATION. These unaudited condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States. These principles require the use of estimates and reflect all adjustments that are, in the opinion of management, necessary for a fair statement of our results for the interim periods presented. All such adjustments are of a normal recurring nature. Actual results may vary from our estimates. Certain prior year amounts have been reclassified to conform to the 2019 presentation. The unaudited interim financial information contained in these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements contained in our 2018 Annual Report. NEW ACCOUNTING GUIDANCE. We adopted Accounting Standards Update No. 2016-02 — Leases (Topic 842) on January 1, 2019. The update required the recognition of right-of-use lease assets and liabilities on the balance sheet and the disclosure of qualitative and quantitative information about leasing arrangements. We adopted this standard using a modified retrospective approach without restating prior comparative periods. We also elected to use certain practical expedients that allowed us to not perform the following: (1) reassess whether expired or existing non-lease contracts that commenced before January 1, 2019 contained an embedded lease, (2) reevaluate the accounting classification of our existing operating leases, and (3) determine whether initial direct costs related to existing leases should be capitalized under this guidance. On January 1, 2019, we recognized operating lease assets totaling $168.7 million and corresponding operating lease liabilities of $168.7 million related primarily to our real estate leases. At implementation, we also reclassified $27.7 million in deferred rent liabilities related to these leases, reducing the recognized operating lease assets to $141.0 million. The adoption did not have a material impact on our results of operations; however, the initial recognition of our operating lease assets and operating lease liabilities on January 1, 2019, represented a non-cash investing activity that affected the amount reported in other changes in assets and liabilities in our unaudited condensed consolidated statements of cash flows. Our leases accounting policy is included in the Summary of Significant Accounting Policies section below. Additional information on our operating leases is included in Note 6 - Leases. NEWLY ISSUED BUT NOT YET ADOPTED ACCOUNTING GUIDANCE. In August 2018, the FASB issued Accounting Standards Update No. 2018-15 — Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This update provides additional guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. The amendments in this update are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Though early adoption is permitted, we will adopt this update on January 1, 2020, using the prospective method of adoption. We expect that the adoption of this standard will not have a material impact on our financial position and results of operations. We have considered all other newly issued accounting guidance that is applicable to our operations and the preparation of our unaudited condensed consolidated statements, including those we have not yet adopted. We do not believe that any such guidance has or will have a material effect on our financial position or results of operations. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. Leases We review new arrangements at inception to evaluate whether we substantially obtain all the economic benefits of and have the right to control the use of an asset. If we determine that an arrangement qualifies as a lease, we recognize a lease liability and a corresponding asset on the lease’s commencement date. The lease liability is initially measured at the present value of the future minimum lease payments over the lease term using the rate implicit in the arrangement or, if not available, our incremental borrowing rate. An operating lease asset is measured initially at the value of the lease liability less any lease incentives and initial direct costs incurred. Our leases qualify as operating leases and consist primarily of real estate leases for corporate offices, data centers, and other facilities. We measure our operating lease liabilities using an estimated incremental borrowing rate as there is no rate implicit in any of our operating lease arrangements. Since we do not have any outstanding borrowings, we estimate our incremental borrowing rate using an estimated credit rating and available market information. Additionally, certain of our leases contain options to extend or terminate the lease term that, if exercised, would result in the remeasurement of the operating lease liability. Our operating leases contain both lease and non-lease components. Non-lease components are distinct elements of a contract that are not related to securing the use of the lease assets, such as common area maintenance and other management costs. We elected to measure the lease liability of our real estate operating leases by combining the lease and non-lease components into one single lease component. As such, we included the fixed payments and any payments that depend on a rate or index related to our lease and non-lease components in measuring the operating lease liability. We recognize lease expense on a straight-line basis over the lease term. Operating lease expense is recognized as part of technology, occupancy, and facility costs in our unaudited condensed consolidated statements of income.