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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Fair Value Measurements) (Details) - Fair value, measurements, recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 1,488.9 $ 1,726.4
Investments held at fair value 1,496.4 942.9
Total 2,985.3 2,669.3
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0.0 0.0
Investments held at fair value 18.0 17.4
Total 18.0 17.4
Consolidated T. Rowe Price investment products [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 15.7 6.2
Total 195.3 543.5
Liabilities (0.8) (0.1)
Consolidated T. Rowe Price investment products [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 1.6 0.7
Total 1,213.2 1,377.9
Liabilities (6.7) (13.7)
Consolidated T. Rowe Price investment products [Member] | Equity securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 178.5 536.0
Consolidated T. Rowe Price investment products [Member] | Equity securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 471.0 667.5
Consolidated T. Rowe Price investment products [Member] | Fixed income securities [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 0.0 0.0
Consolidated T. Rowe Price investment products [Member] | Fixed income securities [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 721.3 687.4
Consolidated T. Rowe Price investment products [Member] | Other investments [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value 1.1 1.3
Consolidated T. Rowe Price investment products [Member] | Other investments [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held at fair value $ 19.3 $ 22.3