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Mergers and Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 15, 2018
Aug. 09, 2017
Jul. 01, 2017
Business Acquisition [Line Items]        
Goodwill $ 344.2     $ 151.6
AW business        
Business Acquisition [Line Items]        
Net tangible assets acquired   $ 65.9    
Goodwill   171.9    
Total purchase price   469.8    
AW business | Developed technology        
Business Acquisition [Line Items]        
Intangible assets acquired:   113.5    
AW business | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets acquired:   75.0    
AW business | Trade names        
Business Acquisition [Line Items]        
Intangible assets acquired:   28.0    
AW business | Backlog        
Business Acquisition [Line Items]        
Intangible assets acquired:   6.5    
Trilithic, Inc        
Business Acquisition [Line Items]        
Net tangible assets acquired     $ 11.8  
Goodwill     17.8  
Total purchase price     56.4  
Trilithic, Inc | Developed technology        
Business Acquisition [Line Items]        
Intangible assets acquired:     15.5  
Trilithic, Inc | Customer relationships        
Business Acquisition [Line Items]        
Intangible assets acquired:     11.0  
Trilithic, Inc | Other        
Business Acquisition [Line Items]        
Intangible assets acquired:     $ 0.3  
In-process research and development | AW business        
Business Acquisition [Line Items]        
Intangible assets acquired:   $ 9.0