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Condensed Consolidated Statements of Shareholders' Equity (USD $)
In Millions, unless otherwise specified
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2012 $ 146.9 $ 63.4 $ 171.1 $ 8.9 $ (16.4) $ (80.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 116.9 [1]     116.9    
Total other comprehensive income 1.4          
Stock-based payments:            
Stock-based compensation 1.8   1.8      
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures 0.7 0.2 0.7   (0.2)  
Shareholders' Equity [Abstract]            
Payments of Ordinary Dividends, Common Stock 0          
Ending Balance at Jun. 30, 2013 267.7 63.6 173.6 125.8 (16.6) (78.7)
Beginning Balance at Dec. 31, 2013 351.0 63.8 177.0 168.9 (16.8) (41.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 24.5     24.5    
Total other comprehensive income 1.6          
Dividends, Common Stock, Cash (1.9)     (1.9)    
Stock-based payments:            
Stock-based compensation 2.2   2.2      
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures 1.4 0.2 1.2      
Treasury Stock, Value, Acquired, Cost Method (3.3)       (3.3)  
Shareholders' Equity [Abstract]            
Payments of Ordinary Dividends, Common Stock 1.9          
Ending Balance at Jun. 30, 2014 $ 375.5 $ 64.0 $ 180.4 $ 191.5 $ (20.1) $ (40.3)
[1] The change in actuarial losses in the three and six months ended June 30, 2014 includes $1.4 million and $2.7 million of actuarial losses that have been included in the computation of net postretirement pension expense for the period.