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Restructuring, Asset Impairments and Other Charges, net (Tables)
12 Months Ended
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   
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(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