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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Interest And Penalties [Abstract]
Change in unrecognized tax benefit		$ 4.0
Unrecognized tax benefits	$ 35.5	35.5
Unrecognized tax benefits that would impact effective tax rate	18.7	18.7
Unrecognized tax benefits, income tax penalties and interest accrued	8.4	8.4		$ 7.4
Income Tax (Expense) Benefit, Continuing Operations [Abstract]
Effective income tax rate reconciliation, other expense (benefit) reconciling items, amount	2.3		$ 28.5
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	5.0	5.0
Refund of Future Alternative Minimum Tax Credits		5.5
Other Tax Expense (Benefit)	3.0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	5.6	5.5
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount	$ 2.9	$ 22.2

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Refund of Future Alternative Minimum Tax Credits

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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

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