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INVESTMENTS. (Variable Interest Entities) (Details) - Variable interest entity, not primary beneficiary [Member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Variable Interest Entity [Line Items] |  |
Investment carrying values | $ 143.3 | $ 129.2
Unfunded capital commitments | 27.3 | 38.8
Uncollected investment advisory and administrative fees | 5.2 | 7.7
Maximum risk of loss related to nonconsolidated variable interest entities | $ 175.8 | $ 175.7

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- Definition Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Investment Carrying Values, Amount + References No definition available. + Details
Name: | trow_VariableInterestEntityReportingEntityInvolvementMaximumLossExposureInvestmentCarryingValuesAmount
Namespace Prefix: | trow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Uncollected Investment Advisory and Administrative Fees, Amount + References No definition available. + Details
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Namespace Prefix: | trow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Unfunded Capital Commitments, Amount + References No definition available. + Details
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Namespace Prefix: | trow_
Data Type: | xbrli:monetaryItemType
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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