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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Operating Results) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating expenses reflected in net operating income | $ (767.6) | $ (754.0) | $ (2,342.5) | $ (2,248.5)
Income before income taxes | 702.1 | 765.5 | 2,177.0 | 1,994.2
Net income (loss) attributable to redeemable non-controlling interests | (0.8) | (1.4) | 69.0 | 11.1
Consolidation eliminations [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating expenses reflected in net operating income | (2.6) | (1.5) | (6.3) | (4.6)
Consolidated T. Rowe Price investment products [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Income before income taxes | 7.9 | 5.1 | 165.7 | 19.4
Net income attributable to T. Rowe Price Group | 8.7 | 6.5 | 96.7 | 8.3
Net income (loss) attributable to redeemable non-controlling interests | (0.8) | (1.4) | 69.0 | 11.1
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating expenses reflected in net operating income | (3.7) | (3.6) | (10.6) | (9.2)
Net investment income reflected in non-operating income | 11.6 | 8.7 | 176.3 | 28.6
Income before income taxes | 7.9 | 5.1 | 165.7 | 19.4
Voting interest entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Income before income taxes | 0.9 | 4.4 | 19.3 | 3.1
Net income attributable to T. Rowe Price Group | 0.7 | 2.8 | 14.6 | 1.5
Net income (loss) attributable to redeemable non-controlling interests | 0.2 | 1.6 | 4.7 | 1.6
Voting interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating expenses reflected in net operating income | (0.6) | (0.6) | (1.6) | (1.3)
Net investment income reflected in non-operating income | 1.5 | 5.0 | 20.9 | 4.4
Income before income taxes | 0.9 | 4.4 | 19.3 | 3.1
Variable interest entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Income before income taxes | 7.0 | 0.7 | 146.4 | 16.3
Net income attributable to T. Rowe Price Group | 8.0 | 3.7 | 82.1 | 6.8
Net income (loss) attributable to redeemable non-controlling interests | (1.0) | (3.0) | 64.3 | 9.5
Variable interest entities [Member] | Reportable entities [Member] |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |
Operating expenses reflected in net operating income | (3.1) | (3.0) | (9.0) | (7.9)
Net investment income reflected in non-operating income | 10.1 | 3.7 | 155.4 | 24.2
Income before income taxes | $ 7.0 | $ 0.7 | $ 146.4 | $ 16.3

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