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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Description Balance at Beginning of Period Charged (Credited) to Costs and Expenses Charged to Other Accounts Deductions/Write-offs Balance at End of Period
Allowance for deferred tax assets
Year ended December 31, 2017 $ 474.1    $ (30.6)   $ 18.8    (1)   $ —    $ 462.3   
Year ended December 31, 2018 462.3    4.6    15.8    (1)   (135.2)   (2)   347.5   
Year ended December 31, 2019 347.5    5.0    16.6    (3)   (11.2)   (4)   357.9   
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(1) Primarily represents the effects of cumulative translation adjustments.
(2) Primarily relates to the expiration of Japan net operating losses. See Note 16: “Income Taxes”.
(3) Primarily represents the effects of cumulative translation adjustments and includes $14.0 million of additional allowance for deferred tax assets arising from the Quantenna acquisition.
(4) Primarily relates to the write-off of Hong Kong net operating losses upon the liquidation of Sanyo Semiconductor (H.K.) Co., Ltd. as well as the expiration of Japan net operating losses.