Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Unrecognized Tax Benefits
Effective tax rate	12.50%	19.90%
Unrecognized tax benefits, excluding interest and penalties	$ 290.3		$ 293.9
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	280.3		283.4
Interest and penalties, recognized	(1.2)	$ 1.0
Interest and penalties, accrued	$ 25.9		$ 27.1

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

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Amount of unrecognized tax benefits.

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

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