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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Condensed Income Statements, Captions [Line Items] |  |
Operating expenses reflected in net operating income | $ (794.8) | $ (744.2)
Income before income taxes | 735.3 | 599.9
Net income (loss) attributable to redeemable non-controlling interests | 41.4 | 1.8
Operating expenses eliminated against investment advisory and administrative fees | 1,327.3 | 1,328.0
Consolidation eliminations [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating expenses reflected in net operating income | 1.5 | 1.7
Consolidation eliminations [Member] | Investment advisory and administrative fees |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating expenses eliminated against investment advisory and administrative fees | 1.5 | 1.7
Consolidated T. Rowe Price investment products [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Income before income taxes | 98.8 | (1.7)
Net income (loss) attributable to T. Rowe Price Group | 57.4 | (3.5)
Net income (loss) attributable to redeemable non-controlling interests | 41.4 | 1.8
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating expenses reflected in net operating income | (3.1) | (2.5)
Net investment income (loss) reflected in non-operating income | 101.9 | 0.8
Income before income taxes | 98.8 | (1.7)
Voting interest entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Income before income taxes | 7.7 | (1.1)
Net income (loss) attributable to T. Rowe Price Group | 8.7 | (0.7)
Net income (loss) attributable to redeemable non-controlling interests | (1.0) | (0.4)
Voting interest entities [Member] | Reportable entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating expenses reflected in net operating income | (0.3) | (0.3)
Net investment income (loss) reflected in non-operating income | 8.0 | (0.8)
Income before income taxes | 7.7 | (1.1)
Variable interest entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Income before income taxes | 91.1 | (0.6)
Net income (loss) attributable to T. Rowe Price Group | 48.7 | (2.8)
Net income (loss) attributable to redeemable non-controlling interests | 42.4 | 2.2
Variable interest entities [Member] | Reportable entities [Member] |  |
Condensed Income Statements, Captions [Line Items] |  |
Operating expenses reflected in net operating income | (2.8) | (2.2)
Net investment income (loss) reflected in non-operating income | 93.9 | 1.6
Income before income taxes | $ 91.1 | $ (0.6)

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