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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
BALANCE, Shares at Dec. 31, 2013   163,562,149      
BALANCE, Amount at Dec. 31, 2013 $ 2,061.7 $ 1.6 $ 42.8 $ 3,337.9 $ (1,320.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 418.7     418.7  
Repurchases of common stock (487.7)       (487.7)
Stock-based compensation expense 26.3   26.3    
Shares awarded under stock-based compensation plans, including excess income tax benefit of $0.6 in 2016, $17.9 in 2015, and $18.0 in 2014 53.1   (7.3)   60.4
BALANCE, Shares at Dec. 31, 2014   163,562,149      
BALANCE, Amount at Dec. 31, 2014 2,072.1 $ 1.6 61.8 3,756.6 (1,747.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 442.6     442.6  
Repurchases of common stock (237.3)       (237.3)
Treasury stock cancellation, Shares   (43,000,000)      
Treasury stock cancellation 0.0 $ (0.4) (78.7) (1,496.4) 1,575.5
Stock-based compensation expense 24.0   24.0    
Shares awarded under stock-based compensation plans, including excess income tax benefit of $0.6 in 2016, $17.9 in 2015, and $18.0 in 2014 47.9   (1.9)   49.8
BALANCE, Shares at Dec. 31, 2015   120,562,149      
BALANCE, Amount at Dec. 31, 2015 2,349.3 $ 1.2 5.2 2,702.8 (359.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 430.5     430.5  
Repurchases of common stock (499.0)       (499.0)
Stock-based compensation expense 25.1   25.1    
Shares awarded under stock-based compensation plans, including excess income tax benefit of $0.6 in 2016, $17.9 in 2015, and $18.0 in 2014 9.0   (7.5)   16.5
Adjustments to Additional Paid in Capital, Other (4.6)   (4.6)    
BALANCE, Shares at Dec. 31, 2016   120,562,149      
BALANCE, Amount at Dec. 31, 2016 $ 2,310.3 $ 1.2 $ 18.2 $ 3,133.3 $ (842.4)