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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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