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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Earnings before income taxes | $ 136.0 | $ 90.2 | $ 99.8
Income tax expense at Celestica’s statutory income tax rate of 26.5% (2019 - 2021) | 36.1 | 23.9 | 26.4
Foreign income taxed at different rates | (16.9) | (16.3) | (6.7)
Foreign exchange | 1.2 | (8.6) | 5.0
Other, including non-taxable/non-deductible items and changes to net provisions related to tax uncertainties | 8.2 | 25.0 | (5.8)
Tax effect from change in tax rate | (7.6) | 0.0 | (0.8)
Change in unrecognized tax losses and deductible temporary differences | 11.1 | 5.6 | 11.4
Income tax expense | 32.1 | 29.6 | 29.5
Deferred tax expense related to taxable temporary differences, repatriation of undistributed foreign earnings | 6.0 | 16.5 | 6.0
Withholding tax on dividends paid | 7.2 | 1.8 |
Deferred tax assets | $ 47.7 | $ 39.9 | $ 33.6
Thailand |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Initial percentage of tax exemption (percent) | 100.00% |  |
Percentage of tax exemption (percent) | 50.00% |  |

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- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_o&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_56&doctype=Standard -URIDate 2021-03-24 + Details
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