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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to T. Rowe Price Group | $ 351.9 | $ 583.0 | $ 448.9 | $ 453.7 | $ 347.1 | $ 390.9 | $ 373.9 | $ 385.9 | $ 1,837.5 | $ 1,497.8 | $ 1,215.0
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) |  |  |  |  |  |  |  |  | 43.6 | 33.9 | 25.5
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) |  |  |  |  |  |  |  |  | 43.6 | 33.9 | 25.5
Net income allocated to common stockholders (basic) |  |  |  |  |  |  |  |  | 1,793.9 | 1,463.9 | 1,189.5
Net income allocated to common stockholders (diluted) |  |  |  |  |  |  |  |  | $ 1,793.9 | $ 1,463.9 | $ 1,189.5
Weighted-average common shares |  |  |  |  |  |  |  |  |  |  |
Outstanding (in shares) |  |  |  |  |  |  |  |  | 242.2 | 241.2 | 245.5
Outstanding assuming dilution (in shares) |  |  |  |  |  |  |  |  | 246.9 | 245.1 | 250.3
Weighted-average outstanding stock options excluded (in shares) |  |  |  |  |  |  |  |  | 0.0 | 5.0 | 9.9

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