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SEGMENT AND CUSTOMER REPORTING
 6 Months Ended
Jun. 30, 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 June 30Six months ended June 30
2025202420252024
% of total% of total% of total% of total
ATS$819.1 28 %$767.7 32 %$1,626.3 29 %$1,535.6 33 %
CCS
Communications$1,641.2 57 %$935.2 39 %$3,068.9 56 %$1,699.4 37 %
Enterprise433.1 15 %689.0 29 %846.8 15 %1,365.8 30 %
$2,074.3 72 %$1,624.2 68 %$3,915.7 71 %$3,065.2 67 %
Total revenue$2,893.4 $2,391.9 $5,542.0 $4,600.8 

Segment Costs by segment:Three months ended June 30Six months ended June 30
2025202420252024
ATS cost of sales$726.1 $700.9 $1,452.6 $1,402.1 
ATS other Segment Costs49.5 31.7 89.5 66.5 
CCS cost of sales1,829.6 1,438.6 3,460.2 2,728.1 
CCS other Segment Costs73.5 71.1 137.2 123.9 
Total Segment Costs$2,678.7 $2,242.3 $5,139.5 $4,320.6 

Segment income, segment margin, and reconciliation of segment income to earnings before income taxes:Three months ended June 30Six months ended June 30
Note2025202420252024
Segment MarginSegment MarginSegment MarginSegment Margin
ATS segment income and margin$43.5 5.3 %$35.1 4.6 %$84.2 5.2 %$67.0 4.4 %
CCS segment income and margin171.2 8.3 %114.5 7.0 %318.3 8.1 %213.2 7.0 %
Total segment income214.7 149.6 402.5 280.2 
Reconciling items:
Finance costs13.5 15.0 27.2 29.0 
Miscellaneous expense121.7 4.4 3.1 11.0 
Foreign currency forward contracts transitional adjustments— (0.7)— (1.2)
Employee SBC expense15.2 11.9 41.2 34.6 
TRS fair value adjustment (TRS FVA): losses (gains)(97.4)(15.7)(78.3)(47.2)
Amortization of intangible assets (excluding computer software)9.9 9.7 19.9 19.0 
Restructuring and other charges, net of recoveries1114.5 11.5 18.4 16.3 
Earnings before income taxes$257.3 $113.5 $371.0 $218.7 

Customers:

Two customers (both in our CCS segment) individually represented 10% or more of total revenue in Q2 2025 (31% and 13%). Three customers (all in our CCS segment) individually represented 10% or more of total revenue in 1H 2025 (30%, 13% and
10%). Two customers (both in our CCS segment) individually represented 10% or more of total revenue in the second quarter of 2024 (Q2 2024) (32% and 12%) and the first half of 2024 (1H 2024) (33% and 10%).