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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019   165.4      
Beginning balance at Dec. 31, 2019 $ 898.8 $ 1.6 $ 1,602.7 $ 12.0 $ (717.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Share-based compensation expense 7.5   7.5    
Net loss (48.2)       (48.2)
Other comprehensive income (loss) (61.5)     (61.5)  
Ending balance (in shares) at Mar. 31, 2020   165.4      
Ending balance at Mar. 31, 2020 796.6 $ 1.6 1,610.2 (49.5) (765.7)
Beginning balance (in shares) at Dec. 31, 2020   201.8      
Beginning balance at Dec. 31, 2020 1,383.7 $ 2.0 2,363.6 (18.6) (963.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock (in shares)   2.7      
Issuance of common stock   $ 0.0 0.0    
Exercise of stock options and release of stock awards (in shares)   2.5      
Exercise of stock options and release of stock awards 21.9 $ 0.1 21.8    
Share-based compensation expense 17.2   17.2    
Net loss (64.0)       (64.0)
Other comprehensive income (loss) 16.4     16.4  
Ending balance (in shares) at Mar. 31, 2021   207.0      
Ending balance at Mar. 31, 2021 $ 1,375.2 $ 2.1 $ 2,402.6 $ (2.2) $ (1,027.3)