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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Treasury Stock, at Cost
Beginning balance (in shares) at Dec. 31, 2021   211.2        
Beginning balance at Dec. 31, 2021 $ 1,327.4 $ 2.1 $ 2,500.0 $ 6.9 $ (1,181.6) $ 0.0
Beginning balance (in shares) at Dec. 31, 2021           0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and release of stock awards, net of shares withheld (in shares)   2.7        
Exercise of stock options and release of stock awards, net of shares withheld 0.7   0.7      
Issuance of shares from Employee Stock Purchase Plans (in shares)   0.3        
Issuance of shares from Employee Stock Purchase Plan 2.1   2.1      
Share-based compensation expense for equity classified awards 59.5   59.5      
Net loss (590.8)       (590.8)  
Other comprehensive income (loss) 47.7     47.7    
Repurchase of common stock (in shares)           3.1
Repurchase of common stock (31.0)         $ (31.0)
Ending balance (in shares) at Sep. 30, 2022   214.2        
Ending balance at Sep. 30, 2022 815.6 $ 2.1 2,562.3 54.6 (1,772.4) $ (31.0)
Ending balance (in shares) at Sep. 30, 2022           3.1
Beginning balance (in shares) at Jun. 30, 2022   213.5        
Beginning balance at Jun. 30, 2022 1,298.4 $ 2.1 2,542.9 45.1 (1,260.7) $ (31.0)
Beginning balance (in shares) at Jun. 30, 2022           3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and release of stock awards, net of shares withheld (in shares)   0.7        
Share-based compensation expense for equity classified awards 19.4   19.4      
Net loss (511.7)       (511.7)  
Other comprehensive income (loss) 9.5     9.5    
Ending balance (in shares) at Sep. 30, 2022   214.2        
Ending balance at Sep. 30, 2022 $ 815.6 $ 2.1 2,562.3 54.6 (1,772.4) $ (31.0)
Ending balance (in shares) at Sep. 30, 2022           3.1
Beginning balance (in shares) at Dec. 31, 2022 212.6 215.7        
Beginning balance at Dec. 31, 2022 $ 629.5 $ 2.2 2,573.3 71.4 (1,986.4) $ (31.0)
Beginning balance (in shares) at Dec. 31, 2022 3.1         3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and release of stock awards, net of shares withheld (in shares)   3.4        
Exercise of stock options and release of stock awards, net of shares withheld $ (1.0)   (1.0)      
Issuance of shares from Employee Stock Purchase Plans (in shares)   0.4        
Issuance of shares from Employee Stock Purchase Plan 0.8   0.8      
Share-based compensation expense for equity classified awards 50.3   50.3      
Net loss (865.8)       (865.8)  
Other comprehensive income (loss) $ 3.4     3.4    
Ending balance (in shares) at Sep. 30, 2023 216.4 219.5        
Ending balance at Sep. 30, 2023 $ (182.8) $ 2.2 2,623.4 74.8 (2,852.2) $ (31.0)
Ending balance (in shares) at Sep. 30, 2023 3.1         3.1
Beginning balance (in shares) at Jun. 30, 2023   218.8        
Beginning balance at Jun. 30, 2023 $ 31.9 $ 2.2 2,607.4 78.9 (2,625.6) $ (31.0)
Beginning balance (in shares) at Jun. 30, 2023           3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Exercise of stock options and release of stock awards, net of shares withheld (in shares)   0.7        
Exercise of stock options and release of stock awards, net of shares withheld (1.0)   (1.0)      
Share-based compensation expense for equity classified awards 17.0   17.0      
Net loss (226.6)       (226.6)  
Other comprehensive income (loss) $ (4.1)     (4.1)    
Ending balance (in shares) at Sep. 30, 2023 216.4 219.5        
Ending balance at Sep. 30, 2023 $ (182.8) $ 2.2 $ 2,623.4 $ 74.8 $ (2,852.2) $ (31.0)
Ending balance (in shares) at Sep. 30, 2023 3.1         3.1