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Acquisitions, Divestitures and Licensing Transactions - 2019 Acquisition and Pending Acquisition (Details) - USD ($) $ in Millions				6 Months Ended	12 Months Ended
	Oct. 05, 2020	Jun. 19, 2019	Apr. 22, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Acquisition-related costs					$ 1.0	$ 11.3
Discount rate				12.00%		12.00%
Goodwill				$ 1,659.2	1,663.4	$ 1,659.2	$ 932.5
GFUS
Business Acquisition [Line Items]
Purchase price consideration			$ 400.0
Non-refundable deposit	$ 100.0		70.0		100.0	70.0
License fee			$ 30.0
Contingent consideration					$ 230.0
Quantenna
Business Acquisition [Line Items]
Purchase price consideration		$ 1,039.3
Percent of shares acquired		100.00%
Proceeds from lines of credit		$ 900.0
Business combination, revenue recognized				84.8
Business combination, net loss				39.3
Intangible assets acquired				110.9		110.9
Developed technology				58.3		58.3
Goodwill				$ 726.7		$ 726.7
Developed technology | Quantenna
Business Acquisition [Line Items]
Weighted average useful life (in years)						8 years
Intangible Assets, Amortization Period | Quantenna
Business Acquisition [Line Items]
Weighted average useful life (in years)						8 years

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