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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - 6 months ended Jun. 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 207.9     207.9  
Repurchases of common stock (422.3)       (422.3)
Stock-based compensation expense 19.4   19.4    
Shares awarded under stock-based compensation plans, including income tax benefit of $0.6 3.9   (7.0)   10.9
BALANCE, shares at Jun. 30, 2016   120,562,149      
BALANCE at Jun. 30, 2016 $ 2,158.2 $ 1.2 $ 17.6 $ 2,910.7 $ (771.3)