Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Tax expense (benefit)	$ 16.1	$ 12.5
Effective income tax rate	23.10%	23.30%
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax Cuts and Jobs Act of 2017, provisional income tax expense		$ 0.3