Income Taxes - Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of United States federal statutory rate to effective income tax rate
Statutory tax rate (as a percent)	21.00%	21.00%	35.00%
Foreign tax rate differential	5.90%	4.60%	(11.70%)
Permanent differences	1.10%	0.70%	(0.50%)
Mandatory Repatriation	(0.60%)
Mandatory Repatriation		1.70%	27.00%
Tax contingencies	1.40%	0.90%	(1.30%)
Change in tax rates (as a percent)	0.30%	1.10%	0.90%
Withholding taxes	(0.10%)	0.10%	2.20%
Permanent reinvestment assertion accrual	0.30%	(4.90%)	7.80%
State income taxes, net of federal benefits	0.70%	(0.40%)	1.30%
Purchase accounting		0.10%	0.50%
Tax credits	(0.60%)		(0.30%)
Other		0.60%	(1.20%)
Change in valuation allowance for unbenefitted losses		0.50%	(0.30%)
Effective tax rate	29.40%	26.00%	59.40%