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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate (as percent)	27.50%	36.50%	28.30%	35.40%
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 Expense (Benefit)			$ (1.8)
Gross unrecognized tax benefits, including interest and penalties	$ 72.6		$ 72.6		$ 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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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
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Amount of unrecognized tax benefits.

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