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Acquisitions - Allocation of the Purchase Price of Quantenna (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 1,659.2 $ 932.5 $ 916.9
Quantenna      
Business Acquisition [Line Items]      
Cash and cash equivalents 133.4    
Receivables 22.2    
Inventories 41.8    
Other current assets 4.3    
Property, plant and equipment 16.9    
Goodwill 726.7    
Intangible assets (excluding IPRD) 87.1    
IPRD 23.8    
Deferred tax assets 29.2    
Other non-current assets 12.7    
Total assets acquired 1,098.1    
Accounts payable 22.6    
Other current liabilities 17.5    
Deferred tax liabilities 3.3    
Other non-current liabilities 15.4    
Total liabilities assumed 58.8    
Net assets acquired/purchase price $ 1,039.3