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SEGMENT AND CUSTOMER REPORTING | 3 Months Ended
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Mar. 31, 2025
Segment Reporting [Abstract] |
SEGMENT AND CUSTOMER REPORTING | SEGMENT AND CUSTOMER REPORTING Segments: Celestica delivers innovative supply chain solutions to customers in two operating and reportable segments. Our ATS segment consists of our ATS end market, and is comprised of our Aerospace and Defense, Industrial, HealthTech and Capital Equipment businesses. Our CCS segment consists of our Communications and Enterprise (servers and storage) end markets. Segment performance is evaluated based on segment revenue, segment income and segment margin (segment income as a percentage of segment revenue). Segment income is defined as a segment's revenue less its cost of sales and its allocatable portion of SG&A and research and development expenses (collectively, Segment Costs). See note 22 to our 2024 AFS for a description of the businesses that comprise our segments, how segment revenue is attributed, how costs are allocated to our segments, and how segment income and segment margin are determined. Information regarding each reportable segment for the periods indicated is set forth below:
Revenue by segment: | Three months ended March 31 |  |  |  |  |
| 2025 |  | 2024 |  |  |  |  |  |  |  |  |
|  | % of total |  |  | % of total |  |  |  |  |  |  |  |  |  |  |  |  |
ATS | $ | 807.2 |  | 30 | % |  | $ | 767.9 |  | 35 | % |  |  |  |  |  |  |  |  |  |  |  |  |
CCS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Communications | $ | 1,427.7 |  | 54 | % |  | $ | 764.2 |  | 34 | % |  |  |  |  |  |  |  |  |  |  |  |  |
Enterprise | 413.7 |  | 16 | % |  | 676.8 |  | 31 | % |  |  |  |  |  |  |  |  |  |  |  |  |
| $ | 1,841.4 |  | 70 | % |  | $ | 1,441.0 |  | 65 | % |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ | 2,648.6 |  |  |  | $ | 2,208.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Costs by segment: | Three months ended March 31
| 2025 |  | 2024 |
ATS cost of sales | $ | 726.5 |  |  | $ | 701.2 |  |
ATS other Segment Costs | 40.0 |  |  | 34.8 |  |
CCS cost of sales | 1,630.6 |  |  | 1,289.5 |  |
CCS other Segment Costs | 63.7 |  |  | 52.8 |  |
Total Segment Costs | $ | 2,460.8 |  |  | $ | 2,078.3 |  |
Segment income, segment margin, and reconciliation of segment income to earnings before income taxes: | Three months ended March 31 |  |  |  |
| Note | 2025 |  | 2024 |  |  |  |  |  |  |  |
|  |  | Segment Margin |  |  | Segment Margin |  |  |  |  |  |  |  |  |  |  |  |
ATS segment income and margin |  | $ | 40.7 |  | 5.0 | % |  | $ | 31.9 |  | 4.2 | % |  |  |  |  |  |  |  |  |  |  |  |
CCS segment income and margin |  | 147.1 |  | 8.0 | % |  | 98.7 |  | 6.8 | % |  |  |  |  |  |  |  |  |  |  |  |
Total segment income |  | 187.8 |  |  |  | 130.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciling items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance costs |  | 13.7 |  |  |  | 14.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Miscellaneous expense | 12 | 1.4 |  |  |  | 6.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts transitional adjustments |  | — |  |  |  | (0.5) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee SBC expense |  | 26.0 |  |  |  | 22.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
TRS fair value adjustment (TRS FVA): losses (gains) |  | 19.1 |  |  |  | (31.5) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets (excluding computer software) |  | 10.0 |  |  |  | 9.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges, net of recoveries | 11 | 3.9 |  |  |  | 4.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  | $ | 113.7 |  |  |  | $ | 105.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers: Three customers (all in our CCS segment) individually represented 10% or more of total revenue in Q1 2025 (28%, 13% and 10%). One customer (in our CCS segment) individually represented 10% or more of total revenue in Q1 2024 (34%).

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- Definition The entire disclosure for reporting segments including data and tables. 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