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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 |

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