CONSOLIDATED INVESTMENT PRODUCTS - Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 3,049.0	$ 2,309.8
Total	5,014.9	3,770.9
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Total	60.7	59.7
Fair value, measurements, recurring | Level 1 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	2.8	6.3
Equity securities	475.2	452.3
Fixed income securities	0.0	0.0
Other investments	0.4	1.6
Total	478.4	460.2
Liabilities	(0.3)	(1.7)
Fair value, measurements, recurring | Level 2 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Equity securities	376.5	285.4
Fixed income securities	1,002.5	1,173.5
Other investments	30.9	23.4
Total	1,409.9	1,482.3
Liabilities	$ (5.1)	$ (14.5)