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Revenue from Contracts with Customers
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
Disaggregation of Revenue
The Company operates in two business segments: High Performance Materials & Components (HPMC) and Advanced Alloys & Solutions (AA&S). Revenue is disaggregated within these two business segments by diversified global markets, primary geographical markets and diversified products. Comparative information regarding the Company’s overall revenues by global and geographical markets for the quarters ended March 31, 2024 and April 2, 2023 is included in the following tables.
(in millions)Quarter ended
March 31, 2024April 2, 2023
HPMCAA&STotalHPMCAA&STotal
Diversified Global Markets:
Aerospace & Defense:
   Jet Engines- Commercial$296.9 $14.3 $311.2 $282.5 $28.4 $310.9 
   Airframes- Commercial85.7 104.4 190.1 71.0 98.9 169.9 
   Defense60.0 54.4 114.4 41.9 53.0 94.9 
   Total Aerospace & Defense442.6 173.1 615.7 395.4 180.3 575.7 
Energy:
   Oil & Gas3.5 99.0 102.5 2.4 125.1 127.5 
   Specialty Energy18.2 37.9 56.1 24.9 57.8 82.7 
   Total Energy21.7 136.9 158.6 27.3 182.9 210.2 
Medical35.9 23.2 59.1 17.5 17.5 35.0 
Automotive5.0 51.0 56.0 6.3 53.1 59.4 
Electronics1.0 51.9 52.9 0.5 33.9 34.4 
Construction/Mining6.7 20.5 27.2 8.2 32.2 40.4 
Food Equipment & Appliances— 11.9 11.9 — 21.5 21.5 
Other17.0 44.5 61.5 15.9 45.6 61.5 
Total$529.9 $513.0 $1,042.9 $471.1 $567.0 $1,038.1 

(in millions)Quarter ended
March 31, 2024April 2, 2023
HPMCAA&STotalHPMCAA&STotal
Primary Geographical Market:
United States$240.7 $330.9 $571.6 $196.5 $391.8 $588.3 
Europe211.5 50.7 262.2 194.2 44.4 238.6 
Asia38.9 77.3 116.2 44.0 109.5 153.5 
Canada15.3 12.3 27.6 12.0 11.2 23.2 
South America, Middle East and other23.5 41.8 65.3 24.4 10.1 34.5 
Total$529.9 $513.0 $1,042.9 $471.1 $567.0 $1,038.1 
Comparative information regarding the Company’s major products based on their percentages of sales is included in the following table. Hot-Rolling and Processing Facility (HRPF) conversion service sales in the AA&S segment are excluded from this presentation.
Quarter ended
March 31, 2024April 2, 2023
HPMCAA&STotalHPMCAA&STotal
Diversified Products and Services:
     Nickel-based alloys and specialty alloys39 %51 %45 %45 %60 %53 %
     Precision forgings, castings and components36 %— %19 %34 %— %16 %
     Titanium and titanium-based alloys24 %12 %18 %20 %8 %14 %
     Zirconium and related alloys— %20 %10 %— %13 %7 %
     Precision rolled strip products1 %17 %8 %1 %19 %10 %
Total100 %100 %100 %100 %100 %100 %
The Company maintained a backlog of confirmed orders totaling $3.9 billion and $3.3 billion at March 31, 2024 and April 2, 2023, respectively. Due to the structure of the Company’s long-term agreements, approximately 70% of this backlog at March 31, 2024 represented booked orders with performance obligations that will be satisfied within the next 12 months. The backlog does not reflect any elements of variable consideration.
Contract balances
As of March 31, 2024 and December 31, 2023, accounts receivable from customers were $723.6 million and $628.2 million, respectively. The following represents the rollforward of accounts receivable - reserve for doubtful accounts and contract assets and liabilities for the quarters ended March 31, 2024 and April 2, 2023:
(in millions)
Accounts Receivable - Reserve for Doubtful AccountsMarch 31,
2024		April 2,
2023
Balance as of beginning of year$3.2 $7.7 
Expense to increase the reserve— — 
Write-off of uncollectible accounts(0.1)(0.3)
Balance as of period end$3.1 $7.4 
(in millions)
Contract Assets
Short-termMarch 31,
2024		April 2,
2023
Balance as of beginning of year$59.1 $64.1 
Recognized in current year28.0 20.4 
Reclassified to accounts receivable(21.8)(31.8)
Balance as of period end$65.3 $52.7 
(in millions)
Contract Liabilities
Short-termMarch 31,
2024		April 2,
2023
Balance as of beginning of year$163.6 $149.1 
Recognized in current year38.1 33.6 
Amounts in beginning balance reclassified to revenue(36.7)(51.7)
Current year amounts reclassified to revenue(9.3)(0.4)
Reclassification to/from long-term5.9 19.1 
Balance as of period end$161.6 $149.7 
Long-term (a)March 31,
2024		April 2,
2023
Balance as of beginning of year$39.4 $66.8 
Recognized in current year0.6 1.0 
Reclassification to/from short-term(5.9)(19.1)
Balance as of period end$34.1 $48.7 
(a) Long-term contract liabilities are included in other long-term liabilities on the consolidated balance sheets.

Contract costs for obtaining and fulfilling a contract were $8.2 million and $8.1 million as of March 31, 2024 and December 31, 2023, respectively, and are reported in other long-term assets on the consolidated balance sheet. Contract cost amortization expense for the quarters ended March 31, 2024 and April 2, 2023 was $0.3 million.