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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Fair Value Measurements) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total $ 5,173.5   $ 4,504.0
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total 15.6   $ 13.5
Fair value, measurements, recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Cash equivalents 2,487.5 $ 1,931.1  
Other investments 0.2 0.5  
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 7.0  
Equity securities 225.7 308.0  
Fixed income securities 0.0 0.0  
Other investments 4.0 2.6  
Total 232.5 317.6  
Liabilities (0.4) (0.4)  
Fair value, measurements, recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other investments 0.7 0.6  
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 449.9 708.0  
Fixed income securities 1,107.2 1,411.3  
Other investments 35.2 131.0  
Total 1,592.3 2,250.3  
Liabilities $ (9.9) $ (18.8)