CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 1,967.5	$ 1,376.5
Net cash provided by (used in) investing activities	(155.0)	38.1
Net cash provided by (used in) financing activities	(728.2)	(617.2)
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment products	0.5	(1.8)
Net change in cash and cash equivalents during period	1,084.8	795.6
Cash and cash equivalents at beginning of period, including $77.2 million at December 31, 2023, and $119.1 million at December 31, 2022, held by consolidated sponsored investment products	2,143.8	1,874.7
Cash and cash equivalents at end of period, including $55.1 million at September 30, 2024, and $91.6 million at September 30, 2023, held by consolidated sponsored investment products	3,228.6	2,670.3
Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents at beginning of period, including $77.2 million at December 31, 2023, and $119.1 million at December 31, 2022, held by consolidated sponsored investment products	77.2	119.1
Cash and cash equivalents at end of period, including $55.1 million at September 30, 2024, and $91.6 million at September 30, 2023, held by consolidated sponsored investment products	55.1	91.6
Reportable entities \| Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(352.8)	(731.5)
Net cash provided by (used in) investing activities	(15.7)	(35.6)
Net cash provided by (used in) financing activities	345.9	741.4
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment products	0.5	(1.8)
Net change in cash and cash equivalents during period	(22.1)	(27.5)
Cash and cash equivalents at beginning of period, including $77.2 million at December 31, 2023, and $119.1 million at December 31, 2022, held by consolidated sponsored investment products	77.2	119.1
Cash and cash equivalents at end of period, including $55.1 million at September 30, 2024, and $91.6 million at September 30, 2023, held by consolidated sponsored investment products	55.1	91.6
Reportable entities \| Voting interest entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(170.5)	(417.5)
Net cash provided by (used in) investing activities	(14.7)	(12.3)
Net cash provided by (used in) financing activities	165.3	441.0
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment products	0.0	0.0
Net change in cash and cash equivalents during period	(19.9)	11.2
Cash and cash equivalents at beginning of period, including $77.2 million at December 31, 2023, and $119.1 million at December 31, 2022, held by consolidated sponsored investment products	25.7	16.2
Cash and cash equivalents at end of period, including $55.1 million at September 30, 2024, and $91.6 million at September 30, 2023, held by consolidated sponsored investment products	5.8	27.4
Reportable entities \| Variable interest entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(182.3)	(314.0)
Net cash provided by (used in) investing activities	(1.0)	(23.3)
Net cash provided by (used in) financing activities	180.6	300.4
Effect of exchange rate changes on cash and cash equivalents of consolidated sponsored investment products	0.5	(1.8)
Net change in cash and cash equivalents during period	(2.2)	(38.7)
Cash and cash equivalents at beginning of period, including $77.2 million at December 31, 2023, and $119.1 million at December 31, 2022, held by consolidated sponsored investment products	51.5	102.9
Cash and cash equivalents at end of period, including $55.1 million at September 30, 2024, and $91.6 million at September 30, 2023, held by consolidated sponsored investment products	$ 49.3	$ 64.2

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