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Income Taxes - Reconciliation Of Income Taxes (Details) $ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2017 USD ($) | [2]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  | $ 81.9 | $ 133.1 |  |  | $ 163.0 |  |
Income tax expense at Celestica’s statutory income tax rate of 26.5% (2017 and 2016 — 26.5%) |  |  | 21.7 | 35.3 |  |  | 43.2 |  |
Manufacturing and processing deduction |  |  | (0.1) | (0.1) |  |  | (0.1) |  |
Foreign income taxed at different rates |  |  | (9.1) | (7.6) |  |  | (0.1) |  |
Foreign exchange |  |  | 3.8 | (6.8) |  |  | 4.8 |  |
Other, including non-taxable/non-deductible items and changes to net provisions related to tax uncertainties |  |  | 11.3 | 3.4 |  |  | (25.3) |  |
Change in unrecognized tax losses and deductible temporary differences |  |  | (44.6) | 3.4 |  |  | 2.2 |  |
Income tax expense |  |  | $ (17.0) | $ 27.6 | [1] |  | $ 24.7 | [1] |
Statutory income tax rate |  |  | 26.50% | 26.50% |  | 26.50% | 26.50% |  |
Deferred tax expense related to taxable temporary differences, repatriation of undistributed foreign earnings |  |  |  | $ 4.0 |  |  | $ 8.0 |  |
Current tax expense for withholding tax on dividends paid |  |  | $ 3.5 | 6.0 |  |  |  |  |
Tax effect of reversal of provisions for tax uncertainties related to transfer pricing matter | $ 45 | $ 34.0 |  |  |  | $ 45 | 34.0 |  |
Deferred tax assets |  | $ 35.3 | 36.7 | $ 37.6 | [2] |  | $ 35.3 |  | $ 35.3
U.S. group of subsidiaries |  |  |  |  |  |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |  |  |  |  |  |
Deferred tax assets |  |  | $ 53.3 |  |  |  |  |  |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)
[2] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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