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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
Effective income tax rate (benefit) (as a percent) | (33.80%) | 22.70% | 16.60% |
Deferred tax assets, valuation allowance | $ 249.9 | $ 357.9 |  |
Balance of unrecognized tax benefit | 151.0 | 130.0 | $ 112.2 | $ 114.8
Unrecognized tax position, that would affect the annual effective tax rate | 116.0 |  |  |
Unrecognized Tax Benefits that would impact Deferred Taxes | 35.0 |  |  |
Estimate of decrease in unrecognized tax positions | 48.8 |  |  |
Interest and penalties tax expense | 0.2 |  |  |
Accrued interest and penalties | 5.3 | 5.1 | $ 5.1 |
Federal |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 99.0 | 521.9 |  |
Tax credit carryforwards | 153.4 | 134.5 |  |
State |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 741.3 | 825.8 |  |
Tax credit carryforwards | 141.1 | 138.6 |  |
Deferred tax assets, valuation allowance | 72.5 |  |  |
Foreign |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | 581.6 | 757.1 |  |
Tax credit carryforwards | 69.4 | $ 76.8 |  |
National Tax Agency, Japan |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowance | $ 128.5 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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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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