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Restructuring, Asset Impairments and Other Charges, net - Narrative (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) employees | Dec. 31, 2020 USD ($) employees | Jul. 03, 2020 USD ($) segment | Apr. 03, 2020 USD ($) employee | Jun. 28, 2019 employee | Oct. 02, 2020 USD ($) employees | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) employee | Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring, asset impairments and other charges, net |  |  |  |  |  |  | $ 65.2 | $ 28.7 | $ 4.3
Accrued liabilities | $ 6.2 | $ 6.2 |  |  |  |  | 6.2 | 0.2 | $ 0.5
Charges |  |  |  |  |  |  | 51.6 | 24.9 |
Voluntary separation program | Workforce Reduction |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated | employee |  |  |  | 243 |  |  |  |  |
Restructuring, asset impairments and other charges, net |  |  |  | $ 27.5 |  |  | 27.5 |  |
2020 Involuntary separation program |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated | segment |  |  | 191 |  |  |  |  |  |
Severance Costs |  |  | $ 11.8 |  |  |  |  |  |
2020 Involuntary separation program | Workforce Reduction |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring, asset impairments and other charges, net |  |  |  |  |  |  | 11.8 |  |
General workforce reduction |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated | employees | 67 | 106 |  |  |  | 153 |  |  |
Severance Costs |  | $ 6.1 |  |  |  | $ 6.2 |  |  |
Accrued liabilities | $ 5.3 | $ 5.3 |  |  |  |  | 5.3 |  |
General workforce reduction | Workforce Reduction |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring, asset impairments and other charges, net |  |  |  |  |  |  | 12.3 | $ 8.4 |
General workforce reduction | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated | employee |  |  |  |  |  |  |  | 143 |
Charges |  |  |  |  |  |  | $ 8.4 |  |
Post-Quantenna acquisition restructuring |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring, asset impairments and other charges, net |  |  |  |  |  |  |  | $ 15.7 |
Charges |  |  |  |  |  |  |  | $ 15.7 |
Post-Quantenna acquisition restructuring | Employee Severance |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated | employee |  |  |  |  | 8 |  |  | 10 |

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