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Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Treasury Stock, At Cost
Retained Earnings
Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Change in cumulative translation adjustment $ 1.4         $ 1.4
Beginning Balance (in shares) at Dec. 31, 2017   37,094        
Beginning Balance at Dec. 31, 2017 211.8 $ 0.4 $ 186.5 $ (21.8) $ 44.8 1.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock-based compensation expense 0.4   0.4      
Issuance of restricted stock (in shares)   38        
Issuance of restricted stock 0.0   (0.5) 0.5    
Stock withheld for employee taxes (in shares)   (31)        
Stock withheld for employee taxes (0.9)   (0.5) (0.4)    
Proceeds from issuance of common stock (in shares)   72        
Proceeds from issuance of common stock 0.8   (0.1) 0.9    
Dividends declared (4.1)       (4.1)  
Net income 14.6       14.6  
Ending Balance (in shares) at Mar. 31, 2018   37,173        
Ending Balance at Mar. 31, 2018 $ 224.0 $ 0.4 $ 185.8 $ (20.8) $ 55.3 $ 3.3