EARNINGS PER SHARE CALCULATIONS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Stock options with anti-diluted impact (in shares)	0	0	0	0
Net income attributable to T. Rowe Price Group, Inc.	$ 646.1	$ 603.0	$ 1,641.8	$ 1,660.2
Less: net income allocated to outstanding restricted stock and stock unit holders (basic)	14.7	15.5	39.5	44.2
Less: net income allocated to outstanding restricted stock and stock unit holders (diluted)	14.7	15.5	39.5	44.2
Net income allocated to common stockholders (basic)	631.4	587.5	1,602.3	1,616.0
Net income allocated to common stockholders (diluted)	$ 631.4	$ 587.5	$ 1,602.3	$ 1,616.0
Weighted-average common shares
Outstanding (in shares)	219,400,000	222,300,000	220,600,000	223,000,000.0
Outstanding assuming dilution (in shares)	219,700,000	222,800,000	220,900,000	223,500,000