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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Adjustment
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Accumulated Deficit
Adjustment
Treasury Stock
Balance at beginning of period (shares) at Dec. 31, 2018     90.0          
Balance at beginning of period at Dec. 31, 2018 $ 663.3 $ 2.1 $ 0.1 $ 1,560.6 $ 1.5 $ (798.9) $ 2.1 $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     1.1          
Issuance of common stock under equity incentive plans 0.3     0.3        
Issuance of common stock for Employee Stock Purchase Plan (shares)     0.1          
Issuance of common stock for Employee Stock Purchase Plan 4.8     4.8        
Share-based compensation expense 54.7     54.7        
Net income (loss) (37.4)         (37.4)    
Other comprehensive income (loss) 0.5       0.5      
Balance at end of period (shares) at Jun. 30, 2019     91.2          
Balance at end of period at Jun. 30, 2019 688.3   $ 0.1 1,620.4 2.0 (834.2)   (100.0)
Balance at beginning of period (shares) at Mar. 31, 2019     91.0          
Balance at beginning of period at Mar. 31, 2019 668.6   $ 0.1 1,590.6 1.6 (823.7)   (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     0.2          
Issuance of common stock under equity incentive plans 0.1     0.1        
Share-based compensation expense 29.7     29.7        
Net income (loss) (10.5)         (10.5)    
Other comprehensive income (loss) 0.4       0.4      
Balance at end of period (shares) at Jun. 30, 2019     91.2          
Balance at end of period at Jun. 30, 2019 688.3   $ 0.1 1,620.4 2.0 (834.2)   (100.0)
Balance at beginning of period (shares) at Dec. 31, 2019     91.6          
Balance at beginning of period at Dec. 31, 2019 882.6   $ 0.1 1,675.9 2.3 (695.7)   (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     0.8          
Issuance of common stock under equity incentive plans 0.3     0.3        
Issuance of common stock for Employee Stock Purchase Plan 6.4     6.4        
Equity component of 2025 Notes issuance, net of issuance costs 289.4     289.4        
Repurchase and conversions of 2022 Notes, net of tax (shares)     3.0          
Repurchase and conversions of 2022 Notes, net of tax 53.2     53.2        
Share-based compensation expense 54.6     54.6        
Net income (loss) 66.2         66.2    
Other comprehensive income (loss) 1.2       1.2      
Balance at end of period (shares) at Jun. 30, 2020     95.4          
Balance at end of period at Jun. 30, 2020 1,353.9   $ 0.1 2,079.8 3.5 (629.5)   (100.0)
Balance at beginning of period (shares) at Mar. 31, 2020     92.3          
Balance at beginning of period at Mar. 31, 2020 934.5   $ 0.1 1,706.5 3.7 (675.8)   (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock under equity incentive plans (shares)     0.1          
Equity component of 2025 Notes issuance, net of issuance costs 289.4     289.4        
Repurchase and conversions of 2022 Notes, net of tax (shares)     3.0          
Repurchase and conversions of 2022 Notes, net of tax 53.2     53.2        
Share-based compensation expense 30.7     30.7        
Net income (loss) 46.3         46.3    
Other comprehensive income (loss) (0.2)       (0.2)      
Balance at end of period (shares) at Jun. 30, 2020     95.4          
Balance at end of period at Jun. 30, 2020 $ 1,353.9   $ 0.1 $ 2,079.8 $ 3.5 $ (629.5)   $ (100.0)