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Segment and Geographic Information - Reconciliation to IFRS Earnings Before Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Segment income | $ 127.9 | $ 149.3 | $ 106.3
Reconciling items: |  |  |
Employee SBC expense | 25.8 | 34.1 | 33.4
Amortization of intangible assets (excluding computer software) | 25.6 | 29.6 | 15.4
Other Charges (Recoveries) (note 16) | 23.5 | (49.9) | 61.0
Earnings before income taxes | $ 90.2 | $ 99.8 | $ 81.9
ATS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment margin (as a percentage) | 3.30% | 2.80% | 4.60%
CCS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment margin (as a percentage) | 3.50% | 2.60% | 2.50%
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Segment income | $ 199.0 | $ 158.1 | $ 213.9
Operating segments | ATS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment income | 69.7 | 64.2 | 102.5
Operating segments | CCS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment income | 129.3 | 93.9 | 111.4
Reconciling items |  |  |
Reconciling items: |  |  |
Finance costs | 37.7 | 49.5 | 24.4
Employee SBC expense | 25.8 | 34.1 | 33.4
Other Charges (Recoveries) (note 16) | 23.5 | (49.9) | 61.0
Inventory fair value adjustment (note 3) | 0.0 | 0.0 | 1.6
Reconciling items | Intangible assets, excluding computer software |  |  |
Reconciling items: |  |  |
Amortization of intangible assets (excluding computer software) | $ 21.8 | $ 24.6 | $ 11.6

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