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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 loss 10.1     10.1    
Other comprehensive loss (3.5)       (3.5)  
Net settlement on vesting of equity awards, shares   0.0        
Net settlement on vesting of equity awards (0.1)   0.1      
Stock-based compensation charges 2.8   2.8      
Employee stock purchase plan 0.4   0.4      
Exercise of stock options, shares   0.1        
Exercise of stock options 0.4   0.4      
Ending balance at Mar. 31, 2018 500.3 $ 0.3 1,766.6 (472.5) (102.1) (692.0)
Ending balance (in shares) at Mar. 31, 2018   28.4        
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 loss 6.7     6.7    
Other comprehensive loss 4.7       4.7  
Net settlement on vesting of equity awards, shares   0.1        
Net settlement on vesting of equity awards (1.8)   1.8      
Stock-based compensation charges 3.9   3.9      
Employee stock purchase plan 0.6   0.6      
Exercise of stock options, shares   0.0        
Exercise of stock options 0.0   0.0      
Ending balance at Mar. 31, 2019 565.8 $ 0.3 $ 1,780.6 (405.4) $ (117.7) $ (692.0)
Ending balance (in shares) at Mar. 31, 2019   28.6        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of new accounting pronouncement (Note 2) $ (7.6)     $ (7.6)