Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	23.30%	3.60%
Tax expense (benefit)	$ 12.5	$ 2.2
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	0.3
Accounting Standards Update 2016-09 [Member]
Income Tax Disclosure [Abstract]
Tax expense (benefit)	$ 2.1	$ 15.9