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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Fair Value Measurements (Details) - Fair value, measurements, recurring - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 1,997.4 $ 1,678.1
Other investments 0.6 0.7
Total 3,282.3 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 23.6 17.2
Equity securities 430.8 365.1
Fixed income securities 0.0 0.0
Other investments 3.2 3.6
Total 457.6 385.9
Liabilities (4.9) (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 58.6 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 12.0 8.0
Equity securities 228.7 213.6
Fixed income securities 1,308.9 1,241.9
Other investments 14.6 22.8
Total 1,564.2 1,486.3
Liabilities $ (7.5) $ (16.2)