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Restructuring, Asset Impairments and Other Charges, net (Tables) | 12 Months Ended
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Dec. 31, 2019
Restructuring Charges [Abstract] |
Summary of Restructuring, Asset Impairments and Other, Net | Summarized activity included in the “Restructuring, asset impairments and other charges, net” caption on the Company's Consolidated Statements of Operations and Comprehensive Income for the years ended December 31, 2019, 2018 and 2017 is as follows (in millions):
|  | Restructuring |  | Asset Impairments (1) |  | Other (2) |  | Total |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |
General workforce reduction |  | $ | 8.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 8.4 |  |
Post-Quantenna acquisition restructuring |  | 15.7 |  |  | — |  |  | — |  |  | 15.7 |  |
Other |  | 0.8 |  |  | 3.4 |  |  | 0.4 |  |  | 4.6 |  |
Total |  | $ | 24.9 |  |  | $ | 3.4 |  |  | $ | 0.4 |  |  | $ | 28.7 |  |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |
Other |  | $ | 3.9 |  |  | $ | 4.6 |  |  | $ | (4.2) |  |  | $ | 4.3 |  |
Total |  | $ | 3.9 |  |  | $ | 4.6 |  |  | $ | (4.2) |  |  | $ | 4.3 |  |
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |
Post-Fairchild acquisition restructuring costs |  | $ | 9.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 9.7 |  |
Manufacturing relocation |  | (2.1) |  |  | — |  |  | — |  |  | (2.1) |  |
Former System Solutions Group segment voluntary workforce reduction |  | 2.2 |  |  | — |  |  | — |  |  | 2.2 |  |
Other |  | 0.1 |  |  | 7.3 |  |  | 3.6 |  |  | 11.0 |  |
Total |  | $ | 9.9 |  |  | $ | 7.3 |  |  | $ | 3.6 |  |  | $ | 20.8 |  |
_______________________ (1) Includes, among others, impairment charges for ROU assets of $2.5 million, asset impairment charges of $4.6 million, and held-for-sale asset impairment charges of $7.3 million for the years ended December 31, 2019, 2018 and 2017, respectively. (2) Includes gain on sale of certain held-for-sale assets for the year ended December 31, 2018 and charges related to other facility closures and asset disposal activities for the year ended December 31, 2017.
Rollforward of Accrued Restructuring Charges | Summary of changes in accrued restructuring charges as follows (in millions):
|  | Estimated employee separation charges |  | Estimated costs to exit |  | Total
Balance as of December 31, 2017 |  | $ | 1.9 |  |  | $ | 0.2 |  |  | $ | 2.1 |
Charges |  | 3.9 |  |  | — |  |  | 3.9 |
Usage |  | (5.5) |  |  | — |  |  | (5.5) |
Balance as of December 31, 2018 |  | $ | 0.3 |  |  | $ | 0.2 |  |  | $ | 0.5 |
Charges |  | 24.9 |  |  | — |  |  | 24.9 |
Usage |  | (25.1) |  |  | (0.1) |  |  | (25.2) |
Balance as of December 31, 2019 |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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