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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue and Services [Line Items]
Net revenues	$ 1,426.7	$ 1,394.6	$ 4,149.2	$ 4,067.6
Average assets under management	1,130,200.0	1,072,400.0	1,091,500.0	1,045,000.0
Period end assets under management	1,126,300.0		1,126,300.0		$ 962,300.0
T. Rowe Price investment products [Member]
Revenue and Services [Line Items]
Net revenues	1,180.9	1,151.5	3,421.9	3,366.9
U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	980.1	984.2	2,863.3	2,892.3
Average assets under management	650,500.0	641,500.0	633,200.0	629,400.0
Period end assets under management	642,600.0		642,600.0		564,500.0
U.S. mutual funds [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Average assets under management	521,300.0	511,600.0	507,500.0	500,800.0
Period end assets under management	513,000.0		513,000.0		441,100.0
U.S. mutual funds [Member] | Fixed income, including money market [Member]
Revenue and Services [Line Items]
Average assets under management	129,200.0	129,900.0	125,700.0	128,600.0
Period end assets under management	129,600.0		129,600.0		123,400.0
Subadvised and separate accounts and other investment products [Member]
Revenue and Services [Line Items]
Net revenues	422.4	386.0	1,210.2	1,109.8
Average assets under management	479,700.0	430,900.0	458,300.0	415,600.0
Period end assets under management	483,700.0		483,700.0		397,800.0
Subadvised and separate accounts and other investment products [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Average assets under management	370,200.0	331,800.0	353,300.0	318,400.0
Period end assets under management	373,400.0		373,400.0		299,200.0
Subadvised and separate accounts and other investment products [Member] | Fixed income, including money market [Member]
Revenue and Services [Line Items]
Average assets under management	109,500.0	99,100.0	105,000.0	97,200.0
Period end assets under management	110,300.0		110,300.0		$ 98,600.0
Other clients [Member]
Revenue and Services [Line Items]
Net revenues	24.2	24.4	75.7	65.5
Investment advisory fees [Member]
Revenue and Services [Line Items]
Net revenues	1,303.4	1,263.3	3,767.8	3,666.9
Investment advisory fees [Member] | U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	881.0	877.3	2,557.6	2,557.1
Investment advisory fees [Member] | U.S. mutual funds [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Net revenues	754.0	745.5	2,185.3	2,169.0
Investment advisory fees [Member] | U.S. mutual funds [Member] | Fixed income, including money market [Member]
Revenue and Services [Line Items]
Net revenues	127.0	131.8	372.3	388.1
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member]
Revenue and Services [Line Items]
Net revenues	422.4	386.0	1,210.2	1,109.8
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Net revenues	355.5	326.0	1,020.4	931.0
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member] | Fixed income, including money market [Member]
Revenue and Services [Line Items]
Net revenues	66.9	60.0	189.8	178.8
Investment advisory fees [Member] | Other clients [Member]
Revenue and Services [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Administrative service [Member]
Revenue and Services [Line Items]
Net revenues	93.2	96.7	291.0	294.0
Administrative service [Member] | U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	69.0	72.3	215.3	228.5
Administrative service [Member] | Subadvised and separate accounts and other investment products [Member]
Revenue and Services [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Administrative service [Member] | Other clients [Member]
Revenue and Services [Line Items]
Net revenues	24.2	24.4	75.7	65.5
Distribution and servicing fees [Member]
Revenue and Services [Line Items]
Net revenues	30.1	34.6	90.4	106.7
Distribution and servicing fees [Member] | U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	30.1	34.6	90.4	106.7
Distribution and servicing fees [Member] | Subadvised and separate accounts and other investment products [Member]
Revenue and Services [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Distribution and servicing fees [Member] | Other clients [Member]
Revenue and Services [Line Items]
Net revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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