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CONSOLIDATED T. ROWE PRICE INVESTMENT PRODUCTS. (Statement of Cash Flows) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities [1] $ 229.5 $ 170.5 $ 1,530.5
Net cash provided by (used in) investing activities [1] 39.0 106.2 109.0
Net cash provided by (used in) financing activities [1] 461.5 (176.4) (1,973.3)
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products [1] 5.3 (2.1) 0.0
Net change in cash and cash equivalents during period [1] 735.3 98.2 (333.8)
Cash and cash equivalents at beginning of year 1,204.9    
Cash and cash equivalents at end of year 1,902.7 1,204.9  
Consolidation eliminations [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (7.0) (6.6)  
Net cash provided by (used in) investing activities 137.1 284.5  
Net cash provided by (used in) financing activities (130.1) (277.9)  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products 0.0 0.0  
Net change in cash and cash equivalents during period 0.0 0.0  
Consolidated T. Rowe Price investment products [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash and cash equivalents at beginning of year 65.6    
Cash and cash equivalents at end of year 103.1 65.6  
Consolidated T. Rowe Price investment products [Member] | Reportable entities [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (1,315.3) (1,166.6)  
Net cash provided by (used in) investing activities (64.2) 41.4  
Net cash provided by (used in) financing activities 1,411.7 1,192.9  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products 5.3 (2.1)  
Net change in cash and cash equivalents during period 37.5 65.6  
Cash and cash equivalents at beginning of year 65.6 0.0  
Cash and cash equivalents at end of year 103.1 65.6 0.0
Voting interest entities [Member] | Reportable entities [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (33.0) (80.1)  
Net cash provided by (used in) investing activities (9.0) 21.6  
Net cash provided by (used in) financing activities 38.8 68.8  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products 0.0 0.0  
Net change in cash and cash equivalents during period (3.2) 10.3  
Cash and cash equivalents at beginning of year 10.3 0.0  
Cash and cash equivalents at end of year 7.1 10.3 0.0
Variable interest entities [Member] | Reportable entities [Member]      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by (used in) operating activities (1,282.3) (1,086.5)  
Net cash provided by (used in) investing activities (55.2) 19.8  
Net cash provided by (used in) financing activities 1,372.9 1,124.1  
Effect of exchange rate changes on cash and cash equivalents of consolidated T. Rowe Price investment products 5.3 (2.1)  
Net change in cash and cash equivalents during period 40.7 55.3  
Cash and cash equivalents at beginning of year 55.3 0.0  
Cash and cash equivalents at end of year $ 96.0 $ 55.3 $ 0.0
[1] See note 15 for a supplementary consolidating cash flow schedule.