Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Unrecognized Tax Benefits
Effective tax rate	16.20%	17.50%	14.30%	18.10%
Unrecognized tax benefits, excluding interest and penalties	$ 292.0		$ 292.0		$ 293.9
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	281.9		281.9		283.4
Interest and penalties, recognized	1.9	$ 2.5	0.7	$ 3.4
Interest and penalties, accrued	$ 27.8		$ 27.8		$ 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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