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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate | (11.30%) | 31.00% | 20.20% | 28.00% |
Three-year cumulative pretax income (loss) |  |  |  |  | $ 150.9
Valuation allowance |  |  |  |  | $ 54.2
Increase in valuation allowance for deferred tax assets | $ 37.7 |  |  |  |
Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated income tax refunds under CARES Act | 40.0 |  | $ 40.0 |  |
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Estimated income tax refunds under CARES Act | $ 50.0 |  | $ 50.0 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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