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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Millions
Total
Restricted stock units [Member]
Common stock [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 stock units [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
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          
Balances 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              
Balances (in shares) at Dec. 31, 2017     245,111          
Balances 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 453.7           453.7  
Other comprehensive income (loss), net of tax 7.4             7.4
Dividends declared (174.9)           (174.9)  
Common stock-based compensation plans activity                
Shares issued upon option exercises (shares)     1,103          
Shares issued upon option exercises 45.1   $ 0.2   44.9      
Shares issued, net of shares withheld for taxes (shares)       6        
Shares issued, net of shares withheld for taxes   $ (0.4)   $ 0.0   $ (0.4)    
Forfeiture of restricted awards (shares)     (4)          
Stock-based compensation expense 45.6       45.6      
Restricted stock units issued as dividend equivalents 0.0       0.1   (0.1)  
Common shares repurchased (shares)     (2,934)          
Common shares repurchased (313.5)   $ (0.5)   (281.7)   (31.3)  
Balances (in shares) at Mar. 31, 2018     243,282          
Balances at Mar. 31, 2018 5,901.9   $ 48.7   $ 654.6   $ 5,205.0 $ (6.4)
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 1.8              
Other comprehensive income (loss), net of tax, attributable to redeemable non-controlling interests 7.0              
Net subscriptions into T. Rowe Price investment products 177.8              
Net deconsolidations of T. Rowe Price investment products (632.9)              
Ending balances attributable to redeemable non-controlling interests at Mar. 31, 2018 $ 546.5              
[1] Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from the U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.