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Business Combinations - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mist Systems, Inc.      
Business Acquisition [Line Items]      
Net tangible assets acquired/(liabilities) assumed $ 28.3    
Intangible assets 102.0    
Goodwill 228.9    
Total $ 359.2    
HTBase      
Business Acquisition [Line Items]      
Net tangible assets acquired/(liabilities) assumed   $ (1.0)  
Intangible assets   7.8  
Goodwill   14.4  
Total   $ 21.2  
Cyphort      
Business Acquisition [Line Items]      
Net tangible assets acquired/(liabilities) assumed     $ 1.4
Intangible assets     15.4
Goodwill     16.7
Total     $ 33.5