Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Loss Carryforwards [Line Items]
Effective income tax rate, percentage	23.30%	14.50%
Decrease in unrecognized tax benefits is reasonably possible	$ 450.0
Income tax payment, anticipated	$ 150.0
Tax Year 2013
Operating Loss Carryforwards [Line Items]
Tax year under examination	2013
Tax Year 2014
Operating Loss Carryforwards [Line Items]
Tax year under examination	2014
Tax Year 2015
Operating Loss Carryforwards [Line Items]
Tax year under examination	2015