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Segment Information
 12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Segment Information Segment and Geographical Information
The Company operates in three principal segments: Commercial, Defense & Space and Aftermarket. Approximately 83% of the Company's net revenues for the twelve months ended December 31, 2023 came from the Company's two largest customers, Boeing and Airbus. Boeing represents a substantial portion of the Company's revenues across segments. Airbus also represent a substantial portion of revenues in the Commercial segment. The Company's primary profitability measure to review a segment’s operating performance is segment operating income before corporate selling, general and administrative expenses, research and development and unallocated cost of sales.

Corporate selling, general and administrative expenses include centralized functions such as accounting, treasury and human resources that are not specifically related to the Company's operating segments and are not allocated in measuring the operating segments’ profitability and performance and net profit margins. Research and development includes research and development efforts that benefit the Company as a whole and are not unique to a specific segment. All of these items are not specifically related to the Company’s operating segments and are not utilized in measuring the operating segments’ profitability and performance.

The Company’s Commercial segment includes design and manufacturing of forward, mid and rear fuselage sections and systems, struts/pylons, nacelles (including thrust reversers) and related engine structural components, wings and wing components (including flight control surfaces), as well as other miscellaneous structural parts for large commercial aircraft and/or business/regional jets. Sales from this segment are primarily to the aircraft OEMs or engine OEMs of large commercial aircraft and/or business/regional jet programs. Approximately 70%, 65%, and 60% of Commercial segment net revenues came from the Company's contracts with Boeing for the twelve months ended December 31, 2023, 2022, and 2021, respectively. Approximately 23%, 27%, and 30% of Commercial segment net revenues came from the Company's contracts with Airbus for the twelve months ended December 31, 2023, 2022, and 2021, respectively. The Commercial segment manufactures products at the Company's facilities in Wichita, Kansas; Tulsa, Oklahoma; Kinston, North Carolina; Prestwick, Scotland; Casablanca, Morocco; Belfast, Northern Ireland; and Subang, Malaysia. The Commercial segment also includes an assembly plant for the A350 XWB aircraft in Saint-Nazaire, France.

The Company's Defense & Space segment includes design and manufacturing of fuselage, strut, nacelle, and wing aerostructures (primarily) for U.S. Government defense programs, including Boeing P-8, C40, and KC-46 Tanker, which are commercial aircraft that are modified for military use. The segment also includes fabrication, bonding, assembly, testing tooling, processing, engineering analysis, and training on fixed wing aircraft aerostructures, missiles and hypersonics work, including solid rocket motor throats and nozzles and re-entry vehicle thermal protections systems, and forward cockpit and cabin, and fuselage work on rotorcraft aerostructures. Sales from this segment are primarily to the prime contractors on various U.S. Government defense program contracts for which the Company is a sub-contractor. A significant portion of the Defense & Space segment revenues are represented by defense business that is classified by the U.S. Government and cannot be specifically described. Approximately 34%, 34%, and 36% of Defense & Space segment net revenues came from the Company's contracts with an individual customer for the twelve months ended December 31, 2023, 2022, and 2021, respectively. In addition, a customer accounted for approximately 26%, 30%, and 39% of Defense & Space segment net revenues for the twelve months ended December 31, 2023, 2022, and 2021, respectively. The Defense & Space segment manufactures products at the Company's facilities in Wichita, KS; Tulsa, OK; Biddeford, ME; Woonsocket, RI; Belfast, Northern Ireland; and Prestwick, Scotland.

The Company's Aftermarket segment includes design, manufacturing, and marketing of spare parts and maintenance, repair, and overhaul (“MRO”) services, repairs for flight control surfaces and nacelles, radome repairs, rotable assets, engineering services, and advanced composite repair. Approximately 47%, 48%, and 44% of Aftermarket segment net revenues came from the Company's contracts with a single customer for the twelve months ended December 31, 2023, 2022, and 2021, respectively. The Aftermarket segment manufactures products at the Company's facilities in Wichita, KS; Tulsa, OK; Dallas, TX; Prestwick, Scotland; Casablanca, Morocco; and Belfast, Northern Ireland.

 The Company’s segments are consistent with the organization and responsibilities of management reporting to the chief operating decision-maker for the purpose of assessing performance. The Company’s definition of segment operating income differs from Operating income as presented in its primary financial statements and a reconciliation of the segment and consolidated results is provided in the table set forth below.
 While some working capital accounts are maintained on a segment basis, much of the Company’s assets are not managed or maintained on a segment basis. Property, plant and equipment, including tooling, is used in the design and production of products for each of the segments and, therefore, is not allocated to any individual segment. In addition, cash, prepaid expenses, other assets, and deferred taxes are managed and maintained on a consolidated basis and generally do not pertain to any particular segment. Raw materials and certain component parts are used in aerostructure production across all segments. Work-in-process inventory is identifiable by segment, but is managed and evaluated at the program level. As there is no segmentation of the Company’s productive assets, depreciation expense (included in fixed manufacturing costs and selling, general and administrative expenses) and capital expenditures, no allocation of these amounts has been made solely for purposes of segment disclosure requirements.

The following table shows segment revenues and operating income for the twelve months ended December 31, 2023, 2022 and 2021:

Twelve Months Ended December 31, 2023Twelve Months Ended December 31, 2022Twelve Months Ended December 31, 2021
Segment Revenues   
Commercial$4,885.0 $4,068.4 $3,128.1 
Defense & Space789.0 649.8 585.0 
Aftermarket373.9 311.4 239.9 
$6,047.9 $5,029.6 $3,953.0 
Segment Operating (loss) income (1)
  
Commercial(2)
$66.0 $(82.9)$(220.6)
Defense & Space(3)
44.7 72.8 44.3 
Aftermarket(4)
82.4 58.5 50.3 
193.1 48.4 (126.0)
Corporate SG&A(281.9)(279.2)(279.9)
Research and development(45.4)(50.4)(53.3)
Total operating (loss) income$(134.2)$(281.2)$(459.2)

(1)Inclusive of forward losses, changes in estimate on loss programs and cumulative catch-up adjustments. These changes in estimates for the periods ended December 31, 2023, 2022, and 2021 are further detailed in Note 5, Changes in Estimates.
(2)The twelve months ended December 31, 2023 includes excess capacity costs of $177.3 related to temporary B737 MAX, A320 and A220 production schedule changes, costs of $8.1 related to temporary production pause, and $6.3 of restructuring costs. The twelve months ended December 31, 2022 includes the impact of $24.7 in relation to the suspension of activities in Russia, excess production capacity costs of $149.5 related to the temporary B737 MAX and A220 production schedule changes, abnormal costs of $9.6 for workforce adjustments as a result of COVID-19 production pause, net of a U.S. employee retention credit and U.K. government subsidies, $0.2 of restructuring costs, and a net offset of $25.7 related to AMJPP and other costs. The twelve months ended December 31, 2021 includes excess capacity production costs of $206.7 related to the temporary B737 MAX and A220 production schedule changes, abnormal costs of $12.0 for workforce adjustments as a result of COVID-19 production pause, net of U.S. employee retention credit and U.K. government subsidies, $6.8 of restructuring costs, and a $35.9 offset related to AMJPP.
(3)The twelve months ended December 31, 2023 includes excess capacity production costs of $6.8 related to the temporary B737 production schedule changes, costs of $0.2 related to temporary production pause, and $0.9 of restructuring costs. The twelve months ended December 31, 2022 includes excess capacity production costs of $7.8, $0.0 of restructuring costs, and a $2.3 offset related to AMJPP. The twelve months ended December 31, 2021 includes excess capacity costs of $10.8 related to the temporary B737 production schedule changes, $1.1 of restructuring costs, and a $3.0 offset related to AMJPP.
(4)The twelve months ended December 31, 2023 includes ($2.4) of benefit related to the settlement of a contingent consideration obligation related to the Applied Aerodynamics acquisition. The twelve months ended December 31, 2022 includes the impact of $4.4 in relation to the suspension of activities in Russia, $0.0 of restructuring costs, and a $1.9 offset related to AMJPP. The twelve months ended December 31, 2021 includes $0.3 of restructuring costs and a $2.2 offset related to AMJPP.

Most of the Company’s revenue is obtained from sales inside the U.S. However, the Company does generate international sales, primarily from sales to Airbus. The following chart illustrates the split between domestic and foreign revenues:
 Year Ended December 31, 2023Year Ended December 31, 2022Year Ended December 31, 2021
Revenue Source(1)
Net RevenuesPercent of
Total
Net Revenues		Net RevenuesPercent of
Total
Net Revenues		Net RevenuesPercent of
Total
Net Revenues
United States$4,667.1 77 %$3,814.5 76 %$2,822.2 71 %
International 
United Kingdom582.5 10 %632.8 13 %580.4 15 %
Other798.3 13 %582.3 11 %550.4 14 %
Total International1,380.8 23 %1,215.1 24 %1,130.8 29 %
Total Revenues$6,047.9 100 %$5,029.6 100 %$3,953.0 100 %

(1)Net Revenues are attributable to countries based on destination where goods are delivered.

As of December 31, 2023, most of the Company’s property, plant and equipment are located within the U.S. Approximately 18% of the Company's property, plant and equipment based on book value are located in the U.K., with approximately another 5% of the Company's total property, plant and equipment located in countries outside the U.S. and the U.K. The following chart illustrates the split between domestic and foreign assets:

 Year Ended December 31, 2023Year Ended December 31, 2022Year Ended December 31, 2021
Asset LocationTotal
PPE		Percent of
PPE		Total
PPE		Percent of
Total
PPE		Total
PPE		Percent of
Total
PPE
United States$1,605.0 77 %$1,708.2 78 %$1,833.7 77 %
International 
United Kingdom384.0 18 %404.1 18 %451.3 19 %
Other95.2 5 %93.6 4 %100.5 4 %
Total International479.2 23 %497.7 22 %551.8 23 %
Total Property, Plant & Equipment$2,084.2 100 %$2,205.9 100 %$2,385.5 100 %
.