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CONSOLIDATED SPONSORED INVESTMENT PRODUCTS - Fair Value Measurements (Details) - Fair value, measurements, recurring
$ in Millions
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 1,678.9 $ 1,412.0
Other investments 0.6 0.6
Total 2,916.9 2,576.3
Level 1 | Consolidated T. Rowe Price investment products    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0.9 4.4
Equity securities 159.5 136.7
Fixed income securities 0.0 0.0
Other investments 1.1 3.3
Total 161.5 144.4
Liabilities (3.5) (0.9)
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 0.1
Total 49.9 40.6
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 20.6
Equity securities 159.7 167.8
Fixed income securities 1,261.6 1,051.1
Other investments 24.7 30.1
Total 1,446.0 1,269.6
Liabilities (17.0) (19.1)
Level 3    
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 0.0 0.0
Level 3 | 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 0.0 0.0
Fixed income securities 0.0 0.0
Other investments 75.8 71.8
Total 75.8 71.8
Liabilities $ 0.0 $ 0.0
Level 3 | Consolidated T. Rowe Price investment products | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.122 0.124
Level 3 | Consolidated T. Rowe Price investment products | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Measurement input 0.095 0.098