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Consolidated Statement of Stockholders' Equity - USD ($)
shares in Thousands, $ in Millions
Total
Common Stock Issued
Additional Paid-in Capital
Retained Earnings (Accumulated Deficit)
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Dec. 31, 2014 $ 1,491.2 $ 0.5 $ 1,502.5 $ 7.3 $ 0.0 $ (19.1)
Balance (in shares) at Dec. 31, 2014   46,536     0  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (426.3)     (426.3)    
Issuance of common stock upon the exercise or redemption of share-based awards 1.4   1.4      
Issuance of common stock upon the exercise or redemption of share-based awards (in shares)   79        
Stock-based compensation expense 14.1   14.1      
Purchases of treasury stock (1.0)       $ (1.0)  
Purchases of treasury stock (in shares)         21  
Other comprehensive income (loss), net of tax (24.1)         (24.1)
Balance at end of period at Dec. 31, 2015 1,055.3 $ 0.5 1,518.0 (419.0) $ (1.0) (43.2)
Balance (in shares) at Dec. 31, 2015   46,615     21  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 39.8     39.8    
Issuance of common stock upon the exercise or redemption of share-based awards 0.4   0.4      
Issuance of common stock upon the exercise or redemption of share-based awards (in shares)   67        
Stock-based compensation expense 14.8   14.8      
Purchases of treasury stock (0.9)       $ (0.9)  
Purchases of treasury stock (in shares)         32  
Other comprehensive income (loss), net of tax (6.9)         (6.9)
Balance at end of period at Dec. 31, 2016 1,102.5 $ 0.5 1,533.2 (379.2) $ (1.9) (50.1)
Balance (in shares) at Dec. 31, 2016   46,682     53  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 79.3     79.3    
Issuance of common stock upon the exercise or redemption of share-based awards $ 4.7   4.7      
Issuance of common stock upon the exercise or redemption of share-based awards (in shares) 136 238        
Stock-based compensation expense $ 12.6   12.6      
Purchases of treasury stock (2.5)       $ (2.5)  
Purchases of treasury stock (in shares)         63  
Other comprehensive income (loss), net of tax 18.8         18.8
Balance at end of period at Dec. 31, 2017 $ 1,215.4 $ 0.5 $ 1,550.5 $ (299.9) $ (4.4) $ (31.3)
Balance (in shares) at Dec. 31, 2017   46,920     116