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SEGMENT AND CUSTOMER REPORTING (Tables) | 9 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment | Information regarding each reportable segment for the periods indicated is set forth below:
Revenue by segment: | Three months ended September 30 |  | Nine months ended September 30
| 2025 |  | 2024 |  | 2025 |  | 2024
|  | % of total |  |  | % of total |  |  | % of total |  |  | % of total
ATS | $ | 781.0 |  | 24 | % |  | $ | 814.1 |  | 33 | % |  | $ | 2,407.3 |  | 28 | % |  | $ | 2,349.7 |  | 33 | %
CCS |  |  |  |  |  |  |  |  |  |  |
Communications | $ | 1,942.9 |  | 61 | % |  | $ | 1,067.3 |  | 42 | % |  | $ | 5,011.8 |  | 57 | % |  | $ | 2,766.7 |  | 39 | %
Enterprise | 470.1 |  | 15 | % |  | 618.1 |  | 25 | % |  | 1,316.9 |  | 15 | % |  | 1,983.9 |  | 28 | %
| $ | 2,413.0 |  | 76 | % |  | $ | 1,685.4 |  | 67 | % |  | $ | 6,328.7 |  | 72 | % |  | $ | 4,750.6 |  | 67 | %
Total revenue | $ | 3,194.0 |  |  |  | $ | 2,499.5 |  |  |  | $ | 8,736.0 |  |  |  | $ | 7,100.3 |  |
Segment Costs by segment: | Three months ended September 30 |  | Nine months ended September 30 |
| 2025 |  | 2024 |  | 2025 |  | 2024 |
ATS cost of sales | $ | 698.0 |  |  | $ | 746.1 |  |  | $ | 2,150.6 |  |  | $ | 2,148.2 |  |
ATS other Segment Costs | 40.2 |  |  | 27.9 |  |  | 129.7 |  |  | 94.4 |  |
CCS cost of sales | 2,121.6 |  |  | 1,484.8 |  |  | 5,581.8 |  |  | 4,212.9 |  |
CCS other Segment Costs | 92.0 |  |  | 71.9 |  |  | 229.2 |  |  | 195.8 |  |
Total Segment Costs | $ | 2,951.8 |  |  | $ | 2,330.7 |  |  | $ | 8,091.3 |  |  | $ | 6,651.3 |  |
Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated |
Segment income, segment margin, and reconciliation of segment income to earnings before income taxes: | Three months ended September 30 |  | Nine months ended September 30
| Note | 2025 |  | 2024 |  | 2025 |  | 2024
|  |  | Segment Margin |  |  | Segment Margin |  |  | Segment Margin |  |  | Segment Margin
ATS segment income and margin |  | $ | 42.8 |  | 5.5 | % |  | $ | 40.1 |  | 4.9 | % |  | $ | 127.0 |  | 5.3 | % |  | $ | 107.1 |  | 4.6 | %
CCS segment income and margin |  | 199.4 |  | 8.3 | % |  | 128.7 |  | 7.6 | % |  | 517.7 |  | 8.2 | % |  | 341.9 |  | 7.2 | %
Total segment income |  | 242.2 |  |  |  | 168.8 |  |  |  | 644.7 |  |  |  | 449.0 |  |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |  |
Finance costs |  | 12.8 |  |  |  | 11.2 |  |  |  | 40.0 |  |  |  | 40.2 |  |
Miscellaneous expense | 12 | 1.3 |  |  |  | 2.8 |  |  |  | 4.4 |  |  |  | 13.8 |  |
Foreign currency forward contracts transitional adjustments |  | — |  |  |  | (0.5) |  |  |  | — |  |  |  | (1.7) |  |
Employee SBC expense |  | 15.6 |  |  |  | 12.7 |  |  |  | 56.8 |  |  |  | 47.3 |  |
TRS fair value adjustment (TRS FVA): losses (gains) |  | (113.3) |  |  |  | 7.7 |  |  |  | (191.6) |  |  |  | (39.5) |  |
Amortization of intangible assets (excluding computer software) |  | 10.0 |  |  |  | 9.9 |  |  |  | 29.9 |  |  |  | 28.9 |  |
Restructuring and other charges, net of recoveries | 11 | 4.9 |  |  |  | 1.0 |  |  |  | 23.3 |  |  |  | 17.3 |  |
Earnings before income taxes |  | $ | 310.9 |  |  |  | $ | 124.0 |  |  |  | $ | 681.9 |  |  |  | $ | 342.7 |  |

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- Definition Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations. Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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