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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2016 $ 394.1 $ 65.4 $ 200.3 $ 301.8 $ (81.4) $ (92.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 31.2     31.2    
Total other comprehensive income 9.9         9.9 [1]
Cash dividends declared (12.6)     (12.6)    
Stock-based payments:            
Stock-based compensation 2.9   2.9      
Stock option exercises and other 1.6 0.4 2.7   (1.5)  
Performance share unit transactions (1.9) 0.2 (0.2)   (1.9)  
Ending Balance at Sep. 30, 2017 425.2 66.0 205.7 320.4 (84.8) (82.1)
Beginning Balance at Dec. 31, 2017 457.4 66.1 207.7 346.6 (86.1) (76.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 61.5     61.5    
Total other comprehensive income 0.3         0.3 [1]
Cash dividends declared (13.8)     (13.8)    
Stock-based payments:            
Stock-based compensation 5.1   5.1      
Stock option exercises and other 1.3 0.2 2.1   (1.0)  
Ending Balance at Sep. 30, 2018 $ 511.8 $ 66.3 $ 214.9 $ 394.3 $ (87.1) $ (76.6)
[1] Amounts in parentheses indicate losses.