Income Taxes - Effective Income Tax Rate on Income Before Income Taxes (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	35.00%	35.00%
Non-U.S. income taxed at other than the U.S. federal statutory rate	2.80%	(0.10%)	(0.30%)
State and local income taxes	4.20%	3.50%	2.50%
U.S. tax on non-U.S. earnings	0.20%	7.30%	(15.40%)
Valuation allowance	0.40%	1.10%	7.80%
Tax credits and incentives	(6.20%)	(11.20%)	(12.40%)
U.S. federal tax reform impact	(2.60%)	(23.40%)	0.00%
Other	(0.90%)	(1.30%)	0.00%
Effective tax rate	18.90%	10.90%	17.20%