UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Net revenues	$ 1,395.2	$ 1,345.0	$ 2,722.5	$ 2,673.0
Operating expenses
Compensation and related costs	483.2	456.0	974.7	897.4
Distribution and servicing	64.4	71.6	130.8	141.9
Advertising and promotion	19.8	19.0	41.4	43.6
Product-related costs	33.4	37.1	77.6	79.2
Technology, occupancy, and facility costs	104.9	93.2	203.0	187.3
General, administrative, and other	74.4	73.4	147.4	145.1
Total operating expenses	780.1	750.3	1,574.9	1,494.5
Net operating income	615.1	594.7	1,147.6	1,178.5
Non-operating income
Net gains on investments	61.8	17.4	161.9	31.8
Net gains on consolidated investment products	62.8	19.1	164.7	19.9
Other income (loss)	(0.1)	(2.4)	0.7	(1.5)
Total non-operating income	124.5	34.1	327.3	50.2
Income before income taxes	739.6	628.8	1,474.9	1,228.7
Provision for income taxes	183.7	169.2	365.0	313.6
Net income	555.9	459.6	1,109.9	915.1
Less: net income attributable to redeemable non-controlling interests	28.4	10.7	69.8	12.5
Net income attributable to T. Rowe Price Group	$ 527.5	$ 448.9	$ 1,040.1	$ 902.6
Earnings per share on common stock of T. Rowe Price Group
Basic (in dollars per share)	$ 2.18	$ 1.81	$ 4.29	$ 3.62
Diluted (in dollars per share)	$ 2.15	$ 1.77	$ 4.23	$ 3.55
Investment advisory fees [Member]
Revenues
Net revenues	$ 1,270.2	$ 1,214.4	$ 2,464.4	$ 2,403.6
Administrative, distribution, and servicing fees [Member]
Revenues
Net revenues	$ 125.0	$ 130.6	$ 258.1	$ 269.4