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Business Combinations - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 01, 2019
Dec. 07, 2018
Sep. 18, 2017
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Acquisition related costs         $ 16,600,000 $ 4,400,000 $ 2,100,000
Mist Systems, Inc.              
Business Acquisition [Line Items]              
Voting interest acquired 100.00%            
Consideration transferred $ 359,200,000            
Payments to acquire business 354,500,000            
Consideration transferred, share based payments $ 4,600,000            
Share-based compensation assumed, fair value       $ 38,500,000      
Fair value of pre-existing debt   $ 1,600,000          
HTBase              
Business Acquisition [Line Items]              
Voting interest acquired   100.00%          
Payments to acquire business   $ 19,600,000          
Share-based awards assumed, fair value   $ 3,800,000          
Cyphort              
Business Acquisition [Line Items]              
Voting interest acquired     100.00%        
Payments to acquire business     $ 33,500,000        
Share-based awards assumed, fair value     $ 3,800,000