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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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