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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Interest And Penalties [Abstract]
Change in unrecognized tax benefit		$ 5.2
Unrecognized tax benefits	$ 34.3	34.3
Unrecognized tax benefits that would impact effective tax rate	18.1	18.1
Unrecognized tax benefits, income tax penalties and interest accrued	7.8	7.8		$ 7.4
Income Tax (Expense) Benefit, Continuing Operations [Abstract]
Effective income tax rate reconciliation, other expense (benefit) reconciling items, amount	2.5	5.7	$ 30.8
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	3.0	25.1
Refund of Future Alternative Minimum Tax Credits		$ 5.5
Other Tax Expense (Benefit)	$ 18.8

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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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