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Unaudited Condensed Consolidated Statement Of Shareholders' Equity (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
BALANCE at Dec. 31, 2013 $ 2,061.7 $ 1.6 $ 42.8 $ 3,337.9 $ (1,320.6)
BALANCE, shares at Dec. 31, 2013   163,562,149      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 95.1     95.1  
Repurchases of common stock (116.2)       (116.2)
Stock-based compensation expense 7.3   7.3    
Shares awarded under stock-based compensation plans, including income tax benefit of $5.7 21.0   (6.7)   27.7
BALANCE at Mar. 31, 2014 $ 2,068.9 $ 1.6 $ 43.4 $ 3,433.0 $ (1,409.1)
BALANCE, shares at Mar. 31, 2014   163,562,149