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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate (as percent)	29.60%	33.60%
U.S. Federal statutory rate (as percent)	21.00%
Income Tax [Line Items]
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings, income tax benefit	$ 2.1
Gross unrecognized tax benefits, including interest and penalties	$ 68.0		$ 66.5
Minimum
Income Tax [Line Items]
Expected annual effective income tax rate (as percent)	27.00%
Maximum
Income Tax [Line Items]
Expected annual effective income tax rate (as percent)	28.00%

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Expected Annual Effective Income Tax Rate Pertaining to Continuing Operations

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[Line Items] for Income Tax [Table]

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Tax Cuts and Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense (Benefit)

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of unrecognized tax benefits.

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