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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, 2017
USD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Income Taxes [Abstract]            
Earnings before income taxes     $ 132.4   $ 161.0 $ 109.1
Income tax expense at Celestica’s statutory income tax rate of 26.5% (2016 and 2015 — 26.5%)     35.1   42.7 28.9
Manufacturing and processing deduction     (0.1)   (0.1) (0.6)
Foreign income taxed at different rates     (7.6)   (0.1) (19.9)
Foreign exchange     (6.8)   4.8 3.4
Other, including non-taxable/non-deductible items and changes to net provisions related to tax uncertainties     3.4   (25.3) 15.1
Change in unrecognized tax losses and deductible temporary differences     3.4   2.7 15.3
Income tax expense     $ 27.4   $ 24.7 $ 42.2
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         $ 8.0  
Current tax expense for withholding tax on dividends paid     $ 6.0      
Tax effect of reversal of provisions for tax uncertainties related to transfer pricing matter $ 45 $ 34.0   $ 45 $ 34.0