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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to T. Rowe Price Group | $ 545.3 | $ 545.9 | $ 527.5 | $ 512.6 | $ 351.9 | $ 583.0 | $ 448.9 | $ 453.7 | $ 2,131.3 | $ 1,837.5 | $ 1,497.8
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) |  |  |  |  |  |  |  |  | 55.3 | 43.6 | 33.9
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) |  |  |  |  |  |  |  |  | 55.3 | 43.6 | 33.9
Net income allocated to common stockholders (basic) |  |  |  |  |  |  |  |  | 2,076.0 | 1,793.9 | 1,463.9
Net income allocated to common stockholders (diluted) |  |  |  |  |  |  |  |  | $ 2,076.0 | $ 1,793.9 | $ 1,463.9
Weighted-average common shares |  |  |  |  |  |  |  |  |  |  |
Outstanding (in shares) |  |  |  |  |  |  |  |  | 235.4 | 242.2 | 241.2
Outstanding assuming dilution (in shares) |  |  |  |  |  |  |  |  | 238.6 | 246.9 | 245.1
Weighted-average outstanding stock options excluded (in shares) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 5.0

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