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EARNINGS PER SHARE CALCULATIONS. (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |
Net income attributable to T. Rowe Price Group | $ 512.6 | $ 453.7
Less: net income allocated to outstanding restricted stock and stock unit holders (basic) | 13.0 | 10.6
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted) | 13.0 | 10.6
Net income allocated to common stockholders (basic) | 499.6 | 443.1
Net income allocated to common stockholders (diluted) | $ 499.6 | $ 443.1
Weighted-average common shares |  |
Outstanding (in shares) | 236.6 | 244.3
Outstanding assuming dilution (in shares) | 239.6 | 249.8

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