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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents $ 1,681.4 $ 1,902.7    
Investments 2,095.1 1,477.3    
Other assets 177.5 224.0    
Total assets 7,374.3 7,535.4    
Liabilities 925.9 718.2    
Attributable to redeemable non-controlling interests 546.5 992.8    
Consolidated T. Rowe Price investment products [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 84.8   $ 50.2  
Net assets 1,457.6 1,992.5    
Attributable to T. Rowe Price Group 911.1 999.7    
Attributable to redeemable non-controlling interests 546.5 992.8    
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 84.8 103.1 50.2 $ 65.6
Investments 1,391.2 1,914.5    
Other assets 34.8 30.8    
Total assets 1,510.8 2,048.4    
Liabilities 53.2 55.9    
Net assets 1,457.6 1,992.5    
Voting interest entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Net assets 246.9 192.4    
Attributable to T. Rowe Price Group 180.0 131.6    
Attributable to redeemable non-controlling interests 66.9 60.8    
Voting interest entities [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 17.7 7.1 6.7 10.3
Investments 234.0 188.8    
Other assets 20.6 12.9    
Total assets 272.3 208.8    
Liabilities 25.4 16.4    
Net assets 246.9 192.4    
Variable interest entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Net assets 1,210.7 1,800.1    
Attributable to T. Rowe Price Group 731.1 868.1    
Attributable to redeemable non-controlling interests 479.6 932.0    
Variable interest entities [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 67.1 96.0 $ 43.5 $ 55.3
Investments 1,157.2 1,725.7    
Other assets 14.2 17.9    
Total assets 1,238.5 1,839.6    
Liabilities 27.8 39.5    
Net assets 1,210.7 1,800.1    
T. Rowe Price money market mutual funds [Member] | Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 15.7 6.2    
Investments $ 45.3 $ 15.0