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Stockholders' Equity - Schedule of Stock Option and Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Number of shares available for issuance under the Plans        
Beginning balance (in shares) 57.1      
Additional shares authorized (in shares) 21.2      
Stock options assumed (in shares) 0.9      
Options and RSUs canceled (in shares) 1.5      
Shares repurchased for tax withholdings on release of restricted stock (unaudited) (in shares) 1.0      
Restricted stock granted (in shares) (2.5)      
Ending balance (in shares) 79.2 57.1    
Options Outstanding, Number of shares outstanding under the Plans        
Beginning balance (in shares) 1.3      
Stock options assumed (in shares) 0.9      
Options exercised (in shares) (0.2)      
Options granted (in shares) 0.2      
Ending balance (in shares) 2.2 1.3    
Vested during period (in shares) 1.1      
Unvested at end of period (in shares)     1.1  
Options Outstanding, Weighted- average exercise price per share        
Beginning balance (in dollars per share) $ 14.68      
Stock options assumed (in dollars per share) 6.02      
Options exercised (in dollars per share) 5.15      
Ending balance (in dollars per share) 12.45 $ 14.68    
Vested during period (in dollars per share) $ 15.71      
Unvested at end of period (in dollars per shares)     $ 9.22  
Options Outstanding, Weighted- average remaining contractual term (In years)        
Weighted-average contractual term 5 years 1 month 6 days 5 years    
Vested during period 5 years 1 month 6 days      
Options outstanding, aggregate intrinsic value     $ 21.7 $ 9.1
Vested during period, aggregate intrinsic value     7.7  
Unvested during period, aggregate intrinsic value     $ 14.0  
Restricted Stock        
Restricted Stock Outstanding, Number of Plan shares outstanding        
Beginning balance (in shares) 25.0      
RSUs released (in shares) (2.6)      
RSUs canceled (in shares) (1.5)      
Restricted stock granted (in shares) 2.3      
Ending balance (in shares) 23.2 25.0    
Vested during period (in shares) 0.0      
Unvested at end of period (in shares) 25.0 25.0 23.2 25.0
Restricted Stock Outstanding, Weighted- average grant date fair value per share        
Beginning balance (in dollars per share) $ 18.68      
RSUs released (in dollars per share) 17.42      
RSUs canceled (in dollars per share) 17.19      
Shares repurchased for tax withholdings on release of restricted stock (in dollars per share) 17.42      
Restricted stock granted (in dollars per share) 23.79      
Ending balance (in dollars per share) 19.44 $ 18.68    
Vested during period (in dollars per share) 0.00      
Unvested at end of period (in dollars per share) $ 18.68 $ 18.68 $ 19.44 $ 18.68