CONSOLIDATED INVESTMENT PRODUCTS - Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 1,772.1	$ 1,967.5
Net cash provided by (used in) investing activities	(18.9)	(155.0)
Net cash provided by (used in) financing activities	(785.6)	(728.2)
Effect of exchange rate changes on cash and cash equivalents of consolidated investment products	3.4	0.5
Net change in cash and cash equivalents during period	971.0	1,084.8
Cash and cash equivalents at beginning of period, including $63.1 million at December 31, 2024, and $77.2 million at December 31, 2023, held by consolidated investment products	2,712.9	2,143.8
Cash and cash equivalents at end of period, including $49.1 million at September 30, 2025, and $55.1 million at September 30, 2024, held by consolidated investment products	3,683.9	3,228.6
Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents at beginning of period, including $63.1 million at December 31, 2024, and $77.2 million at December 31, 2023, held by consolidated investment products	63.1	77.2
Cash and cash equivalents at end of period, including $49.1 million at September 30, 2025, and $55.1 million at September 30, 2024, held by consolidated investment products	49.1	55.1
Reportable entities \| Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(646.5)	(352.8)
Net cash provided by (used in) investing activities	(35.8)	(15.7)
Net cash provided by (used in) financing activities	664.9	345.9
Effect of exchange rate changes on cash and cash equivalents of consolidated investment products	3.4	0.5
Net change in cash and cash equivalents during period	(14.0)	(22.1)
Cash and cash equivalents at beginning of period, including $63.1 million at December 31, 2024, and $77.2 million at December 31, 2023, held by consolidated investment products	63.1	77.2
Cash and cash equivalents at end of period, including $49.1 million at September 30, 2025, and $55.1 million at September 30, 2024, held by consolidated investment products	49.1	55.1
Reportable entities \| Voting  interest entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(205.7)	(170.5)
Net cash provided by (used in) investing activities	0.7	(14.7)
Net cash provided by (used in) financing activities	199.7	165.3
Effect of exchange rate changes on cash and cash equivalents of consolidated investment products	0.0	0.0
Net change in cash and cash equivalents during period	(5.3)	(19.9)
Cash and cash equivalents at beginning of period, including $63.1 million at December 31, 2024, and $77.2 million at December 31, 2023, held by consolidated investment products	7.2	25.7
Cash and cash equivalents at end of period, including $49.1 million at September 30, 2025, and $55.1 million at September 30, 2024, held by consolidated investment products	1.9	5.8
Reportable entities \| Variable interest entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(440.8)	(182.3)
Net cash provided by (used in) investing activities	(36.5)	(1.0)
Net cash provided by (used in) financing activities	465.2	180.6
Effect of exchange rate changes on cash and cash equivalents of consolidated investment products	3.4	0.5
Net change in cash and cash equivalents during period	(8.7)	(2.2)
Cash and cash equivalents at beginning of period, including $63.1 million at December 31, 2024, and $77.2 million at December 31, 2023, held by consolidated investment products	55.9	51.5
Cash and cash equivalents at end of period, including $49.1 million at September 30, 2025, and $55.1 million at September 30, 2024, held by consolidated investment products	$ 47.2	$ 49.3

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