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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Interest And Penalties [Abstract] |  |  |
Change in unrecognized tax benefit | $ 0.6 |  |
Unrecognized tax benefits | 37.5 |  |
Unrecognized tax benefits that would impact effective tax rate | 20.3 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 9.4 |  | $ 9.0
Income Tax (Expense) Benefit, Continuing Operations [Abstract] |  |  |
Effective income tax rate reconciliation, other expense (benefit) reconciling items, amount | 4.4 | $ 28.3 |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount | 2.3 | 25.1 |
Refund of Future Alternative Minimum Tax Credits |  | 5.5 |
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 0.1 |  |
Excess Tax Benefit from Share-based Compensation, Financing Activities |  | 1.7 |
Effective Income Tax Rate Reconciliation, Stock Options | $ 2.0 |  |
United States Tax Cutsand Jobs |  |  |
Income Tax (Expense) Benefit, Continuing Operations [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  | $ 0.6 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to write-offs of expired stock options. + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + 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=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + 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=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit). + 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=121826272&loc=d3e32687-109319 + Details
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