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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2015 $ 1,006.7 $ 0.9 $ 1,449.9 $ (317.9) $ (126.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net earnings (loss) (42.3)     (42.3)  
Other Comprehensive Income (Loss), Net of Tax (5.9)       (5.9)
Stock-based compensation expense 21.5   21.5    
Tax on restricted stock unit vesting (1.5)   (1.5)    
Purchase of convertible note hedges (44.5)        
Issuance of warrants 39.1   39.1    
Equity component of the convertible notes issuance, net 35.3   35.3    
Balance at Dec. 31, 2016 1,008.4 0.9 1,499.8 (360.2) (132.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net earnings (loss) 68.3     68.3  
Other Comprehensive Income (Loss), Net of Tax 32.1       32.1
Stock-based compensation expense 25.1   25.1    
Tax on restricted stock unit vesting (5.1)   (5.1)    
Common stock issued for exercise of stock options 3.3   3.3    
Balance at Dec. 31, 2017 1,132.1 0.9 1,523.1 (291.9) (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net earnings (loss) 67.7        
Other Comprehensive Income (Loss), Net of Tax (11.0)       (11.0)
Stock-based compensation expense 27.0   27.0    
Tax on restricted stock unit vesting (4.7)   (4.7)    
Common stock issued for exercise of stock options 0.5   0.5    
Balance at Dec. 31, 2018 $ 1,211.6 $ 0.9 $ 1,545.9 $ (224.2) $ (111.0)