Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax expense (benefit)	$ 8.0	$ 14.0	$ 26.5	$ 19.1
Effective Income Tax Rate	13.10%	22.30%	15.10%	11.70%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount				$ 3.5
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax liabilities, undistributed foreign earnings					$ 9.8
Tax Cuts and Jobs Act of 2017, incomplete Accounting, Change in tax rate, provisional income tax expense	$ 0.4		$ 4.1
Accounting Standards Update 2016-09 [Member]
Income Tax Disclosure [Abstract]
Tax expense (benefit)	$ 7.7	$ 4.8	$ 13.2	$ 30.3