Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate, percent	22.30%	30.60%	27.90%	114.50%
Decrease in the valuation allowance	$ 8.1		$ 8.1
Increase (decrease) in unrecognized tax benefits	$ 16.7	$ 2.0	$ 26.4	$ (12.0)

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

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-Name Accounting Standards Codification
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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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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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-Name Accounting Standards Codification
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