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STOCKHOLDERS' EQUITY. (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Stockholders' Equity Note [Abstract] |
Common stock repurchases liability | $ 9.2

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

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