Expected Income Tax Refunds Under CARES Act

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[Line Items] for Income Taxes [Table]

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The cumulative pretax income (loss) position during the three most recent reporting years.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Taxes [Line Items]
Effective tax rate	14.10%	26.50%
Three-year cumulative pretax income (loss)	$ (564.2)		$ 150.9
Valuation allowance			$ 54.2
Recoveries on loan loss and unfunded loan commitments, net of impairment losses	616.1	$ 0.0
Increase in valuation allowance for deferred tax assets	74.4
Minimum
Income Taxes [Line Items]
Estimated income tax refunds under CARES Act	40.0
Maximum
Income Taxes [Line Items]
Estimated income tax refunds under CARES Act	$ 50.0