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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | $ 4,287.7 | $ 3,728.7 | $ 3,687.3
Average assets under management | 909,000.0 | 778,200.0 | 767,900.0
Period end assets under management | 991,100.0 | 810,800.0 |
T. Rowe Price U.S. mutual funds [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | 3,071.9 | 2,705.4 | 2,667.9
Average assets under management | 568,500.0 | 495,500.0 | 493,600.0
Period end assets under management | 606,300.0 | 514,200.0 |
T. Rowe Price U.S. mutual funds [Member] | Stock and blended asset [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | 2,570.9 | 2,228.1 | 2,241.9
Average assets under management | 447,500.0 | 386,100.0 | 387,800.0
Period end assets under management | 480,500.0 | 401,300.0 |
T. Rowe Price U.S. mutual funds [Member] | Bond and money market [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | 501.0 | 477.3 | 426.0
Average assets under management | 121,000.0 | 109,400.0 | 105,800.0
Period end assets under management | 125,800.0 | 112,900.0 |
Other investment products [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | 1,215.8 | 1,023.3 | 1,019.4
Average assets under management | 340,500.0 | 282,700.0 | 274,300.0
Period end assets under management | 384,800.0 | 296,600.0 |
Other investment products [Member] | Stock and blended asset [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | 1,009.4 | 850.3 | 862.2
Average assets under management | 256,400.0 | 211,100.0 | 210,300.0
Period end assets under management | 291,900.0 | 220,800.0 |
Other investment products [Member] | Bond, money market, and stable value [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | 206.4 | 173.0 | 157.2
Average assets under management | 84,100.0 | 71,600.0 | 64,000.0
Period end assets under management | 92,900.0 | 75,800.0 |
Other T. Rowe Price investment products [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services | $ 478.2 | 386.0 | 367.8
Waived money market related fees [Member] |  |  |
Revenue and Services [Line Items] |  |  |
Revenues from advisory services |  | $ 10.5 | $ 47.6

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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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