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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 9 months ended Sep. 30, 2016 - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
BALANCE, shares at Dec. 31, 2015   120,562,149      
BALANCE 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 315.2     315.2  
Repurchases of common stock (472.5)       (472.5)
Stock-based compensation expense 22.5   22.5    
Shares awarded under stock-based compensation plans, including income tax benefit of $0.7 8.5   (7.5)   16.0
Other (2.2)   (2.2)    
BALANCE, shares at Sep. 30, 2016   120,562,149.000000      
BALANCE at Sep. 30, 2016 $ 2,220.8 $ 1.2 $ 18.0 $ 3,018.0 $ (816.4)