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CONSOLIDATED INVESTMENT PRODUCTS - Fair Value Measurements (Details) - Fair value, measurements, recurring - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 2,309.8 $ 1,678.1
Other investments 0.1 0.7
Total 3,770.9 2,937.8
Level 1 | Consolidated T. Rowe Price investment products    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 6.3 17.2
Equity securities 452.3 365.1
Fixed income securities 0.0 0.0
Other investments 1.6 3.6
Total 460.2 385.9
Liabilities (1.7) (5.1)
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0.0 0.0
Other investments 0.0 0.0
Total 59.7 50.2
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 8.0
Equity securities 285.4 213.6
Fixed income securities 1,173.5 1,241.9
Other investments 23.4 22.8
Total 1,482.3 1,486.3
Liabilities $ (14.5) $ (16.2)