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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | $ (2,684.2) | $ (2,489.5) | $ (2,301.7)
Income before income taxes |  |  |  |  |  |  |  |  | 2,505.1 | 1,960.5 | 2,002.4
Net income attributable to redeemable non-controlling interests |  |  |  |  |  |  |  |  | 83.4 | 39.0 | 0.0
Investment advisory and administrative fees | $ (1,286.1) | $ (1,221.7) | $ (1,171.6) | $ (1,113.6) | $ (1,091.2) | $ (1,092.9) | $ (1,044.7) | $ (994.1) | (4,793.0) | (4,222.9) | $ (4,200.6)
Consolidation eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 5.6 | 6.5 |
Investment advisory and administrative fees |  |  |  |  |  |  |  |  | 5.6 | 6.5 |
Consolidated T. Rowe Price investment products [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 181.6 | 108.1 |
Net income attributable to T. Rowe Price Group |  |  |  |  |  |  |  |  | 98.2 | 69.1 |
Net income attributable to redeemable non-controlling interests |  |  |  |  |  |  |  |  | 83.4 | 39.0 |
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | (12.3) | (13.0) |
Net investment non-operating income |  |  |  |  |  |  |  |  | 193.9 | 121.1 |
Income before income taxes |  |  |  |  |  |  |  |  | 181.6 | 108.1 |
Voting interest entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 17.7 | 20.9 |
Net income attributable to T. Rowe Price Group |  |  |  |  |  |  |  |  | 13.3 | 15.0 |
Net income attributable to redeemable non-controlling interests |  |  |  |  |  |  |  |  | 4.4 | 5.9 |
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | (1.1) | (1.6) |
Net investment non-operating income |  |  |  |  |  |  |  |  | 18.8 | 22.5 |
Income before income taxes |  |  |  |  |  |  |  |  | 17.7 | 20.9 |
Variable interest entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 163.9 | 87.2 |
Net income attributable to T. Rowe Price Group |  |  |  |  |  |  |  |  | 84.9 | 54.1 |
Net income attributable to redeemable non-controlling interests |  |  |  |  |  |  |  |  | 79.0 | 33.1 |
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | (11.2) | (11.4) |
Net investment non-operating income |  |  |  |  |  |  |  |  | 175.1 | 98.6 |
Income before income taxes |  |  |  |  |  |  |  |  | $ 163.9 | $ 87.2 |

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