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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 1,562.4	$ 1,781.8
Investments	2,731.3	2,939.8
Other assets	255.1	234.4
Total assets	8,636.9	9,330.4
Liabilities	1,231.9	1,107.3
Attributable to redeemable non-controlling interests	971.0	1,121.0	$ 886.7	$ 740.3
Consolidated T. Rowe Price investment products
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	1,941.4	2,237.7
Attributable to T. Rowe Price Group	970.4	1,116.7
Attributable to redeemable non-controlling interests	971.0	1,121.0
Consolidated T. Rowe Price investment products \| Reportable entities
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	117.7	76.5
Investments	1,838.6	2,172.4
Other assets	68.0	28.0
Total assets	2,024.3	2,276.9
Liabilities	82.9	39.2
Net assets	1,941.4	2,237.7
Consolidated T. Rowe Price investment products \| Reportable entities \| T. Rowe Price investment products
Condensed Balance Sheet Statements, Captions [Line Items]
Investments	35.3	40.2
Consolidated T. Rowe Price investment products \| Money Market Funds \| Reportable entities \| T. Rowe Price investment products
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	22.5	9.1
Voting interest entities
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	217.6	289.4
Attributable to T. Rowe Price Group	155.0	199.6
Attributable to redeemable non-controlling interests	62.6	89.8
Voting interest entities \| Reportable entities
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	23.1	9.9
Investments	197.3	281.1
Other assets	8.1	10.6
Total assets	228.5	301.6
Liabilities	10.9	12.2
Net assets	217.6	289.4
Variable interest entities
Condensed Balance Sheet Statements, Captions [Line Items]
Net assets	1,723.8	1,948.3
Attributable to T. Rowe Price Group	815.4	917.1
Attributable to redeemable non-controlling interests	908.4	1,031.2
Variable interest entities \| Reportable entities
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	94.6	66.6
Investments	1,641.3	1,891.3
Other assets	59.9	17.4
Total assets	1,795.8	1,975.3
Liabilities	72.0	27.0
Net assets	$ 1,723.8	$ 1,948.3