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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Comprehensive Loss [Member]
Balance, Beginning at Dec. 31, 2014 $ 1,115.8 $ 152.8 $ (225.0) $ 507.0 $ 812.3 $ (131.3)
Balance, Beginning, Shares at Dec. 31, 2014   152,800,000 10,600,000      
Net income (loss) (88.1)       (88.1)  
Issuance of shares for employee stock plans and stock-based compensation     (1,000,000)      
Issuance of shares for employee stock plans and stock-based compensation, amount (0.9)   $ (20.5) (19.6)    
Amortization of restricted stock grants 1.8     1.8    
Exercise of stock warrants, shares   200,000        
Exercise of stock warrants, amount 0.0 $ 0.2   (0.2)    
Compensation expense associated with stock awards 7.5     7.5    
Taxes paid related to net settlement of equity awards, shares     400,000      
Taxes paid related to net share settlement of equity awards (6.1)   $ (6.1)      
Tax benefit of employee stock plan transactions (6.1)          
Other comprehensive loss (14.8)         (14.8)
Balance, Ending, Shares at Dec. 31, 2015   153,000,000 10,000,000      
Balance, Ending at Dec. 31, 2015 1,017.0 $ 153.0 $ (210.6) 496.5 724.2 (146.1)
Cumulative effect of adoption of accounting principle 15.9     (0.4) 16.3  
Net income (loss) 149.8       149.8  
Issuance of shares for employee stock plans and stock-based compensation     (1,500,000)      
Issuance of shares for employee stock plans and stock-based compensation, amount (0.4)   $ (30.8) (30.4)    
Amortization of restricted stock grants 2.4     2.4    
Exercise of stock warrants, shares   400,000        
Exercise of stock warrants, amount 0.0 $ 0.4   (0.4)    
Compensation expense associated with stock awards 10.5     10.5    
Taxes paid related to net settlement of equity awards, shares     500,000      
Taxes paid related to net share settlement of equity awards (9.2)   $ (9.2)      
Tax benefit of employee stock plan transactions (9.2)          
Other comprehensive loss $ 8.9         8.9
Balance, Ending, Shares at Dec. 31, 2016 143,169,626 153,400,000 9,000,000      
Balance, Ending at Dec. 31, 2016 $ 1,195.7 $ 153.4 $ (189.0) 478.2 890.3 (137.2)
Net income (loss) 389.8       389.8  
Issuance of shares for employee stock plans and stock-based compensation     (900,000)      
Issuance of shares for employee stock plans and stock-based compensation, amount (0.6)   $ (17.7) (17.1)    
Amortization of restricted stock grants 1.5     1.5    
Compensation expense associated with stock awards 8.0     8.0    
Taxes paid related to net settlement of equity awards, shares     300,000      
Taxes paid related to net share settlement of equity awards (5.9)   $ (6.2)      
Tax benefit of employee stock plan transactions (6.2)          
Other comprehensive loss $ 15.1         15.1
Balance, Ending, Shares at Dec. 31, 2017 144,895,593 153,400,000 8,400,000      
Balance, Ending at Dec. 31, 2017 $ 1,604.5 $ 153.4 $ (177.5) $ 470.6 $ 1,280.1 $ (122.1)