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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Net Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents $ 1,902,700 $ 1,204,900    
Investments 1,477,300 1,257,500    
Other assets 231,900 346,200    
Total assets 7,534,700 6,225,000    
Liabilities 717,500 529,200    
Attributable to redeemable non-controlling interests 992,800 687,200 $ 0 $ 0
Consolidated T. Rowe Price investment products [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 103,100 65,600    
Net assets 1,992,500 1,614,900    
Attributable to redeemable non-controlling interests 992,800 687,200    
Attributable to T. Rowe Price Group 999,700 927,700    
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 103,100 65,600 0  
Investments 1,914,500 1,559,900    
Other assets 30,800 55,000    
Total assets 2,048,400 1,680,500    
Liabilities 55,900 65,600    
Net assets 1,992,500 1,614,900    
Voting interest entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Net assets 192,400 225,600    
Attributable to redeemable non-controlling interests 60,800 69,500    
Attributable to T. Rowe Price Group 131,600 156,100    
Voting interest entities [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 7,100 10,300 0  
Investments 188,800 219,300    
Other assets 12,900 4,800    
Total assets 208,800 234,400    
Liabilities 16,400 8,800    
Net assets 192,400 225,600    
Variable interest entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Net assets 1,800,100 1,389,300    
Attributable to redeemable non-controlling interests 932,000 617,700    
Attributable to T. Rowe Price Group 868,100 771,600    
Variable interest entities [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 96,000 55,300 $ 0  
Investments 1,725,700 1,340,600    
Other assets 17,900 50,200    
Total assets 1,839,600 1,446,100    
Liabilities 39,500 56,800    
Net assets 1,800,100 1,389,300    
T.Rowe Price U.S. mutual funds [Member] | Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]        
Condensed Balance Sheet Statements, Captions [Line Items]        
Cash and cash equivalents 6,200 8,800    
Investments $ 15,000 $ 4,200