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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Fair Value Measurements) (Details) - Fair value, measurements, recurring - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 1,355.6 | $ 1,196.0
Total | 3,309.7 | 3,096.5
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0.0 | 0.0
Total | 9.9 | 19.2
Consolidated T. Rowe Price investment products | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 9.1 | 19.3
Total | 174.6 | 210.6
Liabilities | (0.4) | (0.8)
Consolidated T. Rowe Price investment products | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 1.1 | 0.0
Total | 2,008.0 | 1,392.7
Liabilities | (11.2) | (12.8)
Consolidated T. Rowe Price investment products | Equity securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 162.8 | 189.6
Consolidated T. Rowe Price investment products | Equity securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 724.5 | 483.5
Consolidated T. Rowe Price investment products | Fixed income securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 0.0 | 0.0
Consolidated T. Rowe Price investment products | Fixed income securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 1,248.6 | 890.2
Consolidated T. Rowe Price investment products | Other investments | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | 2.7 | 1.7
Consolidated T. Rowe Price investment products | Other investments | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments | $ 33.8 | $ 19.0

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