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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2017   28.3        
Beginning balance at Dec. 31, 2017 $ 510.4 $ 0.3 $ 1,763.1 $ (462.4) $ (98.6) $ (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (35.8)     (35.8)    
Other comprehensive loss (2.6)       (2.6)  
Net settlement on vesting of equity awards, shares   0.1        
Net settlement on vesting of equity awards (1.1)   (1.1)      
Stock-based compensation charges 9.9   9.9      
Employee stock purchase plan 1.4   1.4      
Exercise of stock options, shares   0.1        
Exercise of stock options 0.5   0.5      
Ending balance at Sep. 30, 2018 554.3 $ 0.3 1,773.8 (426.6) (101.2) (692.0)
Ending balance (in shares) at Sep. 30, 2018   28.5        
Beginning balance (in shares) at Jun. 30, 2018   28.5        
Beginning balance at Jun. 30, 2018 495.3 $ 0.3 1,770.0 (472.8) (110.2) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (46.2)     (46.2)    
Other comprehensive loss 9.0       9.0  
Stock-based compensation charges 3.3   3.3      
Employee stock purchase plan 0.5   0.5      
Ending balance at Sep. 30, 2018 554.3 $ 0.3 1,773.8 (426.6) (101.2) (692.0)
Ending balance (in shares) at Sep. 30, 2018   28.5        
Beginning balance (in shares) at Dec. 31, 2018   28.5        
Beginning balance at Dec. 31, 2018 572.7 $ 0.3 1,777.9 (391.1) (122.4) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (12.4)     (12.4)    
Other comprehensive loss 4.2       4.2  
Net settlement on vesting of equity awards, shares   0.3        
Net settlement on vesting of equity awards (3.7)   (3.7)      
Stock-based compensation charges 12.5   12.5      
Employee stock purchase plan 1.8   1.8      
Exercise of stock options, shares   0.0        
Exercise of stock options 0.7   0.7      
Ending balance at Sep. 30, 2019 593.0 $ 0.3 1,789.2 (386.3) (118.2) (692.0)
Ending balance (in shares) at Sep. 30, 2019   28.8        
Beginning balance (in shares) at Jun. 30, 2019   28.7        
Beginning balance at Jun. 30, 2019 583.7 $ 0.3 1,785.8 (395.7) (114.7) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (9.4)     (9.4)    
Other comprehensive loss (3.5)       (3.5)  
Net settlement on vesting of equity awards, shares   0.1        
Net settlement on vesting of equity awards (1.7)   (1.7)      
Stock-based compensation charges 4.3   4.3      
Employee stock purchase plan 0.6   0.6      
Exercise of stock options, shares   0.0        
Exercise of stock options 0.2   0.2      
Ending balance at Sep. 30, 2019 593.0 $ 0.3 $ 1,789.2 (386.3) $ (118.2) $ (692.0)
Ending balance (in shares) at Sep. 30, 2019   28.8        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of new accounting pronouncement (Note 2) $ (7.6)     $ (7.6)