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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Other Fees Earned from Sponsored U.S. Mutual Funds) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue and Services [Line Items] |  |  |
Administrative fees | $ 358.3 | $ 352.5 | $ 361.8
Distribution and servicing fees | 147.0 | 141.7 | 151.5
T. Rowe Price U.S. mutual funds [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Administrative fees | 283.1 | 277.3 | 292.8
Distribution and servicing fees | $ 147.0 | $ 141.7 | $ 151.5

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- Definition Amount of revenue from providing administrative services, including, but not limited to, accounting, tax, legal, regulatory filing, and share registration activities of managed funds and investment accounts of independent third parties and related and affiliated entities. + References No definition available. + Details
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- Definition Amount of fees from providing distribution services, including but not limited to, marketing and selling fund shares, advertising, printing and mailing of prospectuses and sales literature to investors. + References No definition available. + Details
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- Details
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