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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Fair Value Measurements (Details) - Fair value, measurements, recurring - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 2,735.3 $ 1,678.1
Other investments 0.1 0.7
Total 4,138.4 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 5.8 17.2
Equity securities 325.3 365.1
Fixed income securities 0.0 0.0
Other investments 1.4 3.6
Total 332.5 385.9
Liabilities (1.1) (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 65.1 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 3.6 8.0
Equity securities 266.9 213.6
Fixed income securities 1,151.7 1,241.9
Other investments 21.6 22.8
Total 1,443.8 1,486.3
Liabilities $ (13.0) $ (16.2)