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INFORMATION ABOUT RECEIVABLES, REVENUES, AND SERVICES. (Investment Advisory Services) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Revenue and Services [Line Items]
Net revenues	$ 1,395.2	$ 1,345.0	$ 2,722.5	$ 2,673.0
Average assets under management	1,099,800.0	1,036,500.0	1,071,800.0	1,031,000.0
Period end assets under management	1,125,000.0		1,125,000.0		$ 962,300.0
T. Rowe Price investment products [Member]
Revenue and Services [Line Items]
Net revenues	1,147.6	1,114.8	2,241.0	2,215.4
U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	960.5	956.8	1,883.2	1,908.1
Average assets under management	638,500.0	624,600.0	624,400.0	623,300.0
Period end assets under management	648,300.0		648,300.0		564,500.0
U.S. mutual funds [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Average assets under management	513,100.0	496,100.0	500,400.0	495,400.0
Period end assets under management	521,500.0		521,500.0		441,100.0
U.S. mutual funds [Member] | Fixed income, including money market [Member]
Revenue and Services [Line Items]
Average assets under management	125,400.0	128,500.0	124,000.0	127,900.0
Period end assets under management	126,800.0		126,800.0		123,400.0
Subadvised and separate accounts and other investment products [Member]
Revenue and Services [Line Items]
Net revenues	409.5	367.5	787.8	723.8
Average assets under management	461,300.0	411,900.0	447,400.0	407,700.0
Period end assets under management	476,700.0		476,700.0		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	356,300.0	314,900.0	344,600.0	311,600.0
Period end assets under management	368,800.0		368,800.0		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	105,000.0	97,000.0	102,800.0	96,100.0
Period end assets under management	107,900.0		107,900.0		$ 98,600.0
Other clients [Member]
Revenue and Services [Line Items]
Net revenues	25.2	20.7	51.5	41.1
Investment advisory fees [Member]
Revenue and Services [Line Items]
Net revenues	1,270.2	1,214.4	2,464.4	2,403.6
Investment advisory fees [Member] | U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	860.7	846.9	1,676.6	1,679.8
Investment advisory fees [Member] | U.S. mutual funds [Member] | Equity and blended asset [Member]
Revenue and Services [Line Items]
Net revenues	736.8	718.0	1,431.3	1,423.5
Investment advisory fees [Member] | U.S. mutual funds [Member] | Fixed income, including money market [Member]
Revenue and Services [Line Items]
Net revenues	123.9	128.9	245.3	256.3
Investment advisory fees [Member] | Subadvised and separate accounts and other investment products [Member]
Revenue and Services [Line Items]
Net revenues	409.5	367.5	787.8	723.8
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	346.1	308.0	664.9	605.0
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	63.4	59.5	122.9	118.8
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	94.9	95.1	197.8	197.3
Administrative service [Member] | U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	69.7	74.4	146.3	156.2
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	25.2	20.7	51.5	41.1
Distribution and servicing fees [Member]
Revenue and Services [Line Items]
Net revenues	30.1	35.5	60.3	72.1
Distribution and servicing fees [Member] | U.S. mutual funds [Member]
Revenue and Services [Line Items]
Net revenues	30.1	35.5	60.3	72.1
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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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