CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS - Statement of Cash Flows (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 1,802.0	$ 1,640.7
Net cash used in investing activities	5.7	2.4
Net cash provided by financing activities	(492.7)	(1,311.1)
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products	(0.5)	(7.4)
Net change in cash and cash equivalents during period	1,314.5	324.6
Cash and cash equivalents at beginning of period	2,256.5	1,858.3
Cash and cash equivalents at ending of period	3,571.0	2,182.9
Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents at beginning of period	104.8	76.5
Cash and cash equivalents at ending of period	56.1	124.8
Reportable entities \| Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(222.9)	(49.0)
Net cash used in investing activities	(44.2)	(9.2)
Net cash provided by financing activities	218.9	113.9
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products	(0.5)	(7.4)
Net change in cash and cash equivalents during period	(48.7)	48.3
Cash and cash equivalents at beginning of period	104.8	76.5
Cash and cash equivalents at ending of period	56.1	124.8
Reportable entities \| Voting interest entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(69.0)	0.8
Net cash used in investing activities	(11.8)	(9.2)
Net cash provided by financing activities	74.6	9.9
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products	0.0	0.0
Net change in cash and cash equivalents during period	(6.2)	1.5
Cash and cash equivalents at beginning of period	7.1	9.9
Cash and cash equivalents at ending of period	0.9	11.4
Reportable entities \| Variable interest entities
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(153.9)	(49.8)
Net cash used in investing activities	(32.4)	0.0
Net cash provided by financing activities	144.3	104.0
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products	(0.5)	(7.4)
Net change in cash and cash equivalents during period	(42.5)	46.8
Cash and cash equivalents at beginning of period	97.7	66.6
Cash and cash equivalents at ending of period	55.2	113.4
Consolidation eliminations \| Consolidated T. Rowe Price investment products
Condensed Cash Flow Statements, Captions [Line Items]
Subscriptions payment, net of dividends received	$ 80.2	$ (26.2)

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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