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Business Combinations - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2020
Oct. 26, 2020
Apr. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]          
Acquisition related costs       $ 24.6 $ 16.6
128 Technology          
Business Acquisition [Line Items]          
Voting interest acquired 100.00%        
Consideration transferred $ 448.2        
Payments to acquire business 446.8        
Consideration transferred, share based payments 1.4        
Share-based compensation assumed, fair value $ 29.3        
Netrounds          
Business Acquisition [Line Items]          
Voting interest acquired   100.00%      
Payments to acquire business   $ 33.6      
Mist          
Business Acquisition [Line Items]          
Voting interest acquired     100.00%    
Consideration transferred     $ 359.2    
Payments to acquire business     354.5    
Consideration transferred, share based payments     4.6    
Share-based compensation assumed, fair value     $ 38.5