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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Fair Value Measurements) (Details) - Fair value, measurements, recurring - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 1,931.1	$ 1,355.6
Total	4,504.0	3,309.7
Level 1 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	7.0	9.1
Total	317.6	174.6
Liabilities	(0.4)	(0.4)
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Total	13.5	9.9
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	1.1
Total	2,250.3	2,008.0
Liabilities	(18.8)	(11.2)
Equity securities | Level 1 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	308.0	162.8
Equity securities | Level 2 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	708.0	724.5
Fixed income securities | Level 1 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	0.0	0.0
Fixed income securities | Level 2 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	1,411.3	1,248.6
Other investments | Level 1 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	2.6	2.7
Other investments | Level 2 | Consolidated T. Rowe Price investment products
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments	$ 131.0	$ 33.8

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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- Definition

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+ References

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