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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 6 months ended Jun. 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 226.6     226.6  
Repurchases of common stock (61.3)       (61.3)
Stock-based compensation expense 17.4   17.4    
Shares awarded under stock-based compensation plans, including income tax benefit of $11.7 30.5   (5.3)   35.8
BALANCE, shares at Jun. 30, 2015   163,562,149      
BALANCE at Jun. 30, 2015 $ 2,285.3 $ 1.6 $ 73.9 $ 3,983.2 $ (1,773.4)