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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards |  |  |  |  |
Provisional net charge due to new tax regulations | $ 11,800,000 |  |  | $ 11,800,000 |
Additional charge to revalue deferred tax assets |  |  | $ 700,000 |  |
Operating loss carryforwards, domestic |  | $ 6,000,000.0 |  |  |
Operating loss carryforwards, state and local |  | 549,700,000 |  |  |
Operating loss carryforwards, foreign |  | 304,800,000 |  |  |
Tax credit carryforwards |  | 32,000,000.0 |  |  |
Carryforwards expiring in 2019 |  | 41,100,000 |  |  |
Tax credit carryforwards expiring between 2019 and 2036 |  | 539,100,000 |  |  |
Increase (decrease) in valuation allowance |  | (4,300,000) | 21,600,000 |  |
Undistributed earnings of foreign subsidiaries |  | 98,000,000.0 |  |  |
Unrecognized tax benefit | 31,300,000 | 17,200,000 | 20,300,000 | 31,300,000 | $ 37,900,000
Net unrecognized tax benefits | 20,600,000 | 13,900,000 | 13,800,000 | 20,600,000 |
Unrecognized tax benefits that would impact the effective tax rate if recognized |  | 9,900,000 |  |  |
Gross accrued interest | 3,900,000 | 4,100,000 | 3,800,000 | 3,900,000 |
Net accrued interest | 2,500,000 | 3,200,000 | 2,900,000 | 2,500,000 |
Gross interest income included in income tax (provision) benefit |  | (500,000) | 100,000 | (200,000) |
Penalties excluded | $ 0 | 0 | 0 | 0 |
Excess tax benefits from stock-based compensation awards vested during the year |  | 1,900,000 | 2,200,000 |  |
Tax benefit from prior period adjustments |  | 1,900,000 | 33,000,000.0 | 77,600,000 |
Tax benefit related to various audit settlements, statute expirations, and other adjustments |  | 1,200,000 | $ 7,000,000.0 | 4,900,000 |
Tax credit |  | 1,300,000 |  |  |
Expense related to valuation allowance adjustments |  | 3,800,000 |  |  |
Minimum |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range |  | 5,000,000.0 |  |  |
Maximum |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range |  | $ 10,000,000.0 |  |  |
Foreign Jurisdictions |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Foreign losses generated for which no tax benefit was recognized |  |  |  | $ 68,200,000 |

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- Definition Represents the net (net of applicable income tax effect) amount of interest expense accrued as of the date of statement of financial position for underpayment of income taxes, computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References No definition available. + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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