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Income Taxes - Reconciliation of effective tax rate (Details)	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)				21.00%	35.00%	35.00%
Tax rate difference on foreign income (as a percent)				5.30%	(5.60%)	(5.50%)
State and local taxes - net (as a percent)					0.70%	0.30%
Tax impact of fluctuations in Mexican Pesos to US Dollar					(0.50%)	2.40%
Net impact of U.S. foreign tax credits				0.50%	0.30%	(2.30%)
Net tax impact of US / Canada settlement (as a percent)				0.30%	(1.30%)	3.20%
Net impact of valuation allowance in Argentina				1.00%	2.00%	1.00%
Net impact of transition tax	0.60%			0.60%	2.70%
Net impact of U.S. deferred tax remeasurement		(4.90%)			(4.90%)
Net impact of provision for taxes on unremitted earnings		4.30%	0.30%	0.30%	4.30%	0.50%
Other items - net (as a percent)				(2.10%)	(1.90%)	(1.50%)
Provision at effective tax rate (as a percent)				26.90%	30.80%	33.10%
Mexico
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)				30.00%
Pakistan
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)				29.00%
Colombia
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)				37.00%
Brazil
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)				34.00%

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credits.

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Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to currency translation gains.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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