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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

X

- 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.

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Refund of Future Alternative Minimum Tax Credits

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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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.

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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.

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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).

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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