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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Impact of adoption of ASU 2016-02 | Accounting Standards Update 2016-02 $ 6.5     $ 6.5    
Beginning Balance at Dec. 31, 2018 530.1 $ 66.4 $ 217.0 432.5 $ (88.5) $ (97.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 17.5     17.5    
Total other comprehensive loss (0.3)         (0.3)
Cash dividends declared (4.8)     (4.8)    
Stock-based payments:            
Stock-based compensation 1.4   1.4      
Stock option exercises and other (0.1) 0.0 0.1   (0.2)  
Performance share unit transactions (0.9) 0.1 (0.1)   (0.9)  
Stock repurchase program (1.0)       (1.0)  
Ending Balance at Mar. 31, 2019 548.4 66.5 218.4 451.7 (90.6) (97.6)
Beginning Balance at Dec. 31, 2019 641.6 66.9 228.6 528.2 (93.0) (89.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 23.4     23.4    
Total other comprehensive loss (7.4)         (7.4) [1]
Cash dividends declared (4.8)     (4.8)    
Stock-based payments:            
Stock-based compensation 1.0   1.0      
Stock option exercises and other (1.2) 0.1 0.7   (2.0)  
Performance share unit transactions (2.9) 0.2 (0.2)   (2.9)  
Stock repurchase program (13.5)       (13.5)  
Ending Balance at Mar. 31, 2020 $ 636.2 $ 67.2 $ 230.1 $ 546.8 $ (111.4) $ (96.5)
[1]
Amounts in parentheses indicate losses.