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Acquisitions - Allocation of the Purchase Price of Quantenna (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 1,663.4 $ 1,659.2 $ 932.5
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