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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |
Interest expense limitation carryforward | $ 63.0 |
Valuation allowance | 38.0 | $ 36.3
Unrecognized tax benefits that would impact effective tax rate | 74.1 |
Unrecognized tax benefits, income tax penalties and interest expense | 0.9 |
Accrued interest and penalties | 9.6 | $ 8.7
Expected decrease of unrecognized tax benefits | 5.0 |
Domestic Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 51.5 |
Valuation allowance | 17.3 |
Domestic Tax Authority | Research Tax Credit Carryforward |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforward | 27.9 |
State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 45.7 |
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 66.9 |
Valuation allowance | $ 20.7 |

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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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