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Income Taxes - Reconciliation of effective tax rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of effective tax rate
Provision for tax at statutory rate (as a percent)	21.00%	21.00%	21.00%
Tax rate difference on foreign income (as a percent)	7.90%	5.80%	5.20%
Net impact of tax benefit of intercompany financings (as a percent)	(0.80%)	(1.20%)	(0.80%)
Net impact of global intangible low-taxed income ("GILTI") (as a percent)	(1.00%)	1.20%	1.00%
Net impact of U.S. foreign tax credits	1.60%	1.00%	0.50%
Net impact of valuation allowance in Argentina	(0.60%)	0.30%	1.00%
Other items - net (as a percent)	1.90%	(1.00%)	(1.00%)
Provision at effective tax rate (as a percent)	30.00%	27.10%	26.90%
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%

X

- 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.

+ References

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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").

+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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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 statutory income tax expense (benefit) outside of the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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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 other adjustments.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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