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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating expenses | $ (744.2) | $ (766.6) | $ (690.2) | $ (678.4) | $ (610.9)
Income before income taxes | 599.9 |  |  |  | 636.7
Net income attributable to redeemable non-controlling interests | 1.8 |  |  |  | 14.5
Investment advisory and administrative fees | (1,328.0) | $ (1,297.6) | $ (1,238.7) | $ (1,186.0) | (1,132.6)
Consolidation eliminations [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating expenses | 1.7 |  |  |  | 0.8
Investment advisory and administrative fees | 1.7 |  |  |  | 0.8
Consolidated T. Rowe Price investment products [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Income before income taxes | (1.7) |  |  |  | 46.3
Net income attributable to T. Rowe Price Group | (3.5) |  |  |  | 31.8
Net income attributable to redeemable non-controlling interests | 1.8 |  |  |  | 14.5
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating expenses | (2.5) |  |  |  | (2.6)
Non-operating investment income | 0.8 |  |  |  | 48.9
Income before income taxes | (1.7) |  |  |  | 46.3
Voting interest entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Income before income taxes | (1.1) |  |  |  | 5.0
Net income attributable to T. Rowe Price Group | (0.7) |  |  |  | 3.9
Net income attributable to redeemable non-controlling interests | (0.4) |  |  |  | 1.1
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating expenses | (0.3) |  |  |  | (0.3)
Non-operating investment income | (0.8) |  |  |  | 5.3
Income before income taxes | (1.1) |  |  |  | 5.0
Variable interest entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Income before income taxes | (0.6) |  |  |  | 41.3
Net income attributable to T. Rowe Price Group | (2.8) |  |  |  | 27.9
Net income attributable to redeemable non-controlling interests | 2.2 |  |  |  | 13.4
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |
Operating expenses | (2.2) |  |  |  | (2.3)
Non-operating investment income | 1.6 |  |  |  | 43.6
Income before income taxes | $ (0.6) |  |  |  | $ 41.3

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