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STOCKHOLDERS' EQUITY. (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Stockholders' Equity Note [Abstract] |  |
Unsettled common stock repurchases liability | $ 8.0 | $ 9.2

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- Definition Unsettled Common Stock Repurchases Liabilities + References No definition available. + Details
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Namespace Prefix: | trow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration