Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	6.60%	4.40%
Net unrecognized tax benefit	$ 95.9		$ 89.9
Income tax interest and penalties accrued	5.0
Deferred Income Tax Assets, Net	$ 102.1