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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share [Abstract] |  |  |  |
Stock options with anti-diluted impact (in shares) | 0 | 0 | 0 | 0
Net income attributable to T. Rowe Price Group | $ 545.9 | $ 583.0 | $ 1,586.0 | $ 1,485.6
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) | 13.9 | 13.7 | 40.7 | 34.8
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) | 13.9 | 13.7 | 40.7 | 34.8
Net income allocated to common stockholders (basic) | 532.0 | 569.3 | 1,545.3 | 1,450.8
Net income allocated to common stockholders (diluted) | $ 532.0 | $ 569.3 | $ 1,545.3 | $ 1,450.8
Weighted-average common shares |  |  |  |
Outstanding (in shares) | 234,900,000 | 242,800,000 | 235,800,000 | 243,100,000
Outstanding assuming dilution (in shares) | 238,200,000 | 247,500,000 | 239,000,000.0 | 248,200,000

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