Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	24.70%		35.40%	24.80%	35.50%
Tax Act, provisional income tax benefit		$ 60.6
Undistributed earnings of certain foreign subsidiaries	$ 61.8	$ 58.7		$ 61.8

Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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