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Schedule II - Valuation and Qualifying Accounts (Details) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 347.5 | $ 462.3 | $ 474.1
Charged (Credited) to Costs and Expenses | 5.0 | 4.6 | (30.6)
Charged to Other Accounts | 16.6 | 15.8 | 18.8
Deductions/Write-offs | (11.2) | (135.2) | 0.0
Balance at End of Period | 357.9 | $ 347.5 | $ 462.3
Quantenna |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Charged to Other Accounts | $ 14.0 |  |

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