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Shareholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
May 30, 2010
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Stockholders Equity Note Disclosure [Line Items]        
Common stock, shares authorized     90.0 90.0
Common stock, par value     $ 1 $ 1
Common stock, shares issued     63.4 63.1
Common stock, shares outstanding     62.4 62.2
Preference stock, shares authorized     0.8  
Preference stock, par value     $ 1  
Common stock shares issued 12.1      
Common stock shares issued, price per share $ 6.25      
Gross proceeds from common stock shares issued $ 75.6      
Net proceeds from common stock shares issued 71.2 71.2    
Cumulative translation adjustment income (loss)     10.8 (0.3)
Unrealized gain (loss) on derivatives     0.1 (0.6)
Unrecognized pension benefit plan     $ (91.0) $ (75.5)