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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)				21.00%	21.00%	35.00%
Tax rate difference on foreign income (as a percent)				5.80%	5.30%	(5.60%)
Net impact of tax benefit of intercompany financings (as a percent)				(1.20%)	(0.80%)	(0.80%)
Net impact of global intangible low-taxed income ("GILTI") (as a percent)				1.20%	1.00%
Net impact of U.S. foreign tax credits				1.00%	0.50%	0.30%
Net impact of U.S.-Canada tax settlement					0.30%	(1.30%)
Net impact of valuation allowance in Argentina				0.30%	1.00%	2.00%
Net impact of transition tax	0.006				0.006	0.027
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%
Other items - net (as a percent)				(1.00%)	(2.30%)	(0.90%)
Provision at effective tax rate (as a percent)				27.10%	26.90%	30.80%
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)				33.00%
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 tax benefit of intercompany financings.

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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 global intangible low-taxed income ("GILTI").

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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 foreign tax credits.

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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 the provision for taxes on unremitted earnings.

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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 changes in the valuation allowance for deferred tax assets.

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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.

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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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