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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Restricted shares [Member]
Restricted stock units [Member]
Common stock [Member]
Common stock [Member]
Restricted shares [Member]
Common stock [Member]
Restricted stock units [Member]
Additional capital in excess of par value [Member]
Additional capital in excess of par value [Member]
Restricted shares [Member]
Additional capital in excess of par value [Member]
Restricted stock units [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Balances (in shares) at Dec. 31, 2017       245,111,000              
Beginning Balance at Dec. 31, 2017 $ 5,824.4     $ 49.0     $ 846.1     $ 4,932.9 $ (3.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Reclassification adjustment of stranded tax benefits on currency translation adjustments upon adoption of new accumulated other comprehensive income guidance on January 1, 2018 2.3                    
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2017 992.8                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Cumulative effect adjustment upon adoption of new financial instruments and accumulated other comprehensive income guidance on January 1, 2018 [1] 14.5                 22.4 (7.9)
Balances, As Adjusted 5,838.9     $ 49.0     846.1     4,957.6 (13.8)
Balances (in shares) at Dec. 31, 2017       245,111,000              
Beginning Balance at Dec. 31, 2017 5,824.4     $ 49.0     846.1     4,932.9 (3.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 1,485.6                 1,485.6  
Other comprehensive income (loss), net of tax (17.2)                   (17.2)
Dividends declared $ (522.5)                 (522.5)  
Common stock-based compensation plans activity                      
Shares issued upon option exercises (shares) 3,678,053     2,770,000              
Shares issued upon option exercises $ 117.2     $ 0.6     116.6        
Restricted shares issued, net of shares withheld for taxes (in shares)         8,000            
Restricted shares issued, net of shares withheld for taxes   $ (0.1)     $ 0.0     $ (0.1)      
Shares issued, net of shares withheld for taxes (shares)           71,000          
Shares issued, net of shares withheld for taxes     $ (1.9)     $ 0.0     $ (1.9)    
Forfeiture of restricted awards (shares)       (8,000)              
Forfeiture of restricted awards       $ 0.0     0.0        
Stock-based compensation expense 135.3           135.3        
Restricted stock units issued as dividend equivalents 0.0           0.1     (0.1)  
Common shares repurchased (shares)       (5,353,000)              
Common shares repurchased (574.8)     $ (1.1)     (441.6)     (132.1)  
Balances (in shares) at Sep. 30, 2018       242,599,000              
Ending Balance at Sep. 30, 2018 6,460.5     $ 48.5     $ 654.5     $ 5,788.5 $ (31.0)
Beginning balances attributable to redeemable non-controlling interests at Dec. 31, 2017 992.8                    
Increase (Decrease) in Temporary Equity [Roll Forward]                      
Net income attributable to redeemable non-controlling interests 11.1                    
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests (16.8)                    
Net subscriptions into consolidated T. Rowe Price investment products 468.5                    
Net deconsolidations of T. Rowe Price investment products (595.0)                    
Ending balances attributable to redeemable non-controlling interests at Sep. 30, 2018 $ 860.6                    
[1] Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.