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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 |  |

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