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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
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 $ 0.1 $ 1,560.6 $ 1.5 $ (798.9) $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock under equity incentive plans (shares)   0.9        
Issuance of common stock under equity incentive plans 0.2   0.2      
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 25.0   25.0      
Net income (loss) (26.9)       (26.9)  
Other comprehensive income (loss) 0.1     0.1    
Balance at end of period (shares) at Mar. 31, 2019   91.0        
Balance at end of period at Mar. 31, 2019 668.6 $ 0.1 1,590.6 1.6 (823.7) (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)   0.7        
Issuance of common stock under equity incentive plans 0.3   0.3      
Issuance of common stock for Employee Stock Purchase Plan (shares)   0.0        
Issuance of common stock for Employee Stock Purchase Plan 6.4   6.4      
Share-based compensation expense 23.9   23.9      
Net income (loss) 19.9       19.9  
Other comprehensive income (loss) 1.4     1.4    
Balance at end of period (shares) at Mar. 31, 2020   92.3        
Balance at end of period at Mar. 31, 2020 $ 934.5 $ 0.1 $ 1,706.5 $ 3.7 $ (675.8) $ (100.0)