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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
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%