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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 9 months ended Sep. 30, 2015 - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
BALANCE, shares at Dec. 31, 2014   163,562,149      
BALANCE 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 345.1     345.1  
Repurchases of common stock (211.3)       (211.3)
Stock-based compensation expense 21.2   21.2    
Shares awarded under stock-based compensation plans, including income tax benefit of $13.7 37.8   (4.3)   42.1
BALANCE, shares at Sep. 30, 2015   163,562,149      
BALANCE at Sep. 30, 2015 $ 2,264.9 $ 1.6 $ 78.7 $ 4,101.7 $ (1,917.1)