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Segment and Geographic Information - Reconciliation to IFRS Earnings Before Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |  |
Segment income | $ 167.7 | $ 127.9 | $ 149.3
Reconciling items: |  |  |
Employee SBC expense | 33.4 | 25.8 | 34.1
Amortization of intangible assets (excluding computer software) | 25.5 | 25.6 | 29.6
Other charges (recoveries) (note 15) | 10.3 | 23.5 | (49.9)
Earnings before income taxes | $ 136.0 | $ 90.2 | $ 99.8
ATS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment margin (as a percentage) | 4.50% | 3.30% | 2.80%
CCS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment margin (as a percentage) | 3.90% | 3.50% | 2.60%
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Segment income | $ 233.9 | $ 199.0 | $ 158.1
Operating segments | ATS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment income | 105.0 | 69.7 | 64.2
Operating segments | CCS |  |  |
Disclosure of operating segments [line items] |  |  |
Segment income | 128.9 | 129.3 | 93.9
Reconciling items |  |  |
Reconciling items: |  |  |
Finance costs | 31.7 | 37.7 | 49.5
Employee SBC expense | 33.4 | 25.8 | 34.1
Other charges (recoveries) (note 15) | 10.3 | 23.5 | (49.9)
Reconciling items | Intangible assets, excluding computer software |  |  |
Reconciling items: |  |  |
Amortization of intangible assets (excluding computer software) | $ 22.5 | $ 21.8 | $ 24.6

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