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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue Comparative information of the Company’s overall revenues (in millions) by global and geographical markets for the third quarters and nine months ended September 30, 2021 and 2020 were as follows:
(in millions)Third quarter ended
September 30, 2021September 30, 2020
HPMCAA&STotalHPMCAA&STotal
Diversified Global Markets:
Aerospace & Defense$207.5 $75.4 $282.9 $171.8 $74.3 $246.1 
Energy*57.5 108.7 166.2 24.4 106.0 130.4 
Automotive2.1 89.7 91.8 1.5 57.9 59.4 
Food Equipment & Appliances— 51.6 51.6 — 33.8 33.8 
Electronics0.4 34.4 34.8 0.2 45.7 45.9 
Medical16.8 17.5 34.3 10.6 16.7 27.3 
Construction/Mining5.6 19.7 25.3 4.0 24.3 28.3 
Other10.1 28.7 38.8 8.8 18.0 26.8 
Total$300.0 $425.7 $725.7 $221.3 $376.7 $598.0 
(in millions)Nine Months Ended
September 30, 2021September 30, 2020
HPMCAA&STotalHPMCAA&STotal
Diversified Global Markets:
Aerospace & Defense$605.9 $212.4 $818.3 $782.9 $321.3 $1,104.2 
Energy*136.6 297.0 433.6 71.3 397.2 468.5 
Automotive5.5 245.8 251.3 4.5 182.2 186.7 
Electronics0.9 132.8 133.7 0.7 117.9 118.6 
Food Equipment & Appliances0.1 107.6 107.7 0.1 131.3 131.4 
Medical42.6 52.7 95.3 37.9 57.9 95.8 
Construction/Mining16.8 72.9 89.7 14.3 92.4 106.7 
Other33.1 71.7 104.8 30.6 81.3 111.9 
Total$841.5 $1,192.9 $2,034.4 $942.3 $1,381.5 $2,323.8 
*Includes the oil & gas, downstream processing, and specialty energy markets.
(in millions)Third quarter ended
September 30, 2021September 30, 2020
HPMCAA&STotalHPMCAA&STotal
Primary Geographical Market:
United States$140.8 $256.5 $397.3 $129.3 $219.3 $348.6 
Asia58.3 96.2 154.5 19.9 103.0 122.9 
Europe85.3 26.0 111.3 60.7 34.1 94.8 
Canada9.9 8.5 18.4 4.4 8.5 12.9 
South America, Middle East and other5.7 38.5 44.2 7.0 11.8 18.8 
Total$300.0 $425.7 $725.7 $221.3 $376.7 $598.0 
(in millions)Nine Months Ended
September 30, 2021September 30, 2020
HPMCAA&STotalHPMCAA&STotal
Primary Geographical Market:
United States$426.7 $700.2 $1,126.9 $522.8 $909.1 $1,431.9 
Asia119.0 313.5 432.5 72.6 288.3 360.9 
Europe250.7 87.1 337.8 286.2 104.1 390.3 
Canada27.4 28.3 55.7 21.1 30.0 51.1 
South America, Middle East and other17.7 63.8 81.5 39.6 50.0 89.6 
Total$841.5 $1,192.9 $2,034.4 $942.3 $1,381.5 $2,323.8 
Comparative information of the Company’s major high-value and standard products based on their percentages of sales is included in the following table. In conjunction with the Company’s announced ongoing exit of lower-margin standard stainless sheet products, in the fourth quarter of 2020 ATI reclassified certain items as High-Value Products within AA&S segment results. Prior period information reflects these reclassifications. Hot-Rolling and Processing Facility (HRPF) conversion service sales in the AA&S segment are excluded from this presentation.
Third quarter ended
September 30, 2021September 30, 2020
HPMCAA&STotalHPMCAA&STotal
Diversified Products and Services:
High-Value Products
     Nickel-based alloys and specialty alloys46 %31 %37 %38 %29 %32 %
     Precision rolled strip products— %33 %19 %— %28 %18 %
     Precision forgings, castings and components35 %— %15 %30 %— %11 %
     Titanium and titanium-based alloys19 %7 %12 %32 %8 %17 %
     Zirconium and related alloys— %15 %9 %— %16 %10 %
Total High-Value Products100 %86 %92 %100 %81 %88 %
Standard Products
     Standard stainless products— %14 %8 %— %19 %12 %
Total100 %100 %100 %100 %100 %100 %
Nine Months Ended
September 30, 2021September 30, 2020
HPMCAA&STotalHPMCAA&STotal
Diversified Products and Services:
High-Value Products
     Nickel-based alloys and specialty alloys43 %27 %34 %38 %29 %34 %
     Precision rolled strip products— %34 %19 %— %22 %13 %
     Precision forgings, castings and components37 %— %16 %34 %— %14 %
     Titanium and titanium-based alloys20 %7 %12 %28 %10 %18 %
     Zirconium and related alloys— %17 %10 %— %14 %9 %
Total High-Value Products100 %85 %91 %100 %75 %88 %
Standard Products
     Standard stainless products— %15 %9 %— %25 %12 %
Total100 %100 %100 %100 %100 %100 %
Schedule of Accounts Receivable - Reserve for Doubtful Accounts
(in millions)
Accounts Receivable - Reserve for Doubtful AccountsSeptember 30,
2021		September 30,
2020
Balance as of beginning of fiscal year$4.3 $4.6 
Expense to increase the reserve0.4 0.1 
Write-off of uncollectible accounts(0.6)(0.4)
Balance as of period end$4.1 $4.3 
Schedule of Contract Assets and Liabilities
(in millions)
Contract Assets
Short-termSeptember 30,
2021		September 30,
2020
Balance as of beginning of fiscal year$38.9 $38.5 
Recognized in current year74.3 55.8 
Reclassified to accounts receivable(49.0)(52.7)
Impairment— — 
Reclassification to/from long-term and contract liability(8.5)0.1 
Balance as of period end$55.7 $41.7 
Long-termSeptember 30,
2021		September 30,
2020
Balance as of beginning of fiscal year$— $0.1 
Recognized in current year— — 
Reclassified to accounts receivable— — 
Impairment— — 
Reclassification to/from short-term— (0.1)
Balance as of period end$— $— 
(in millions)
Contract Liabilities
Short-termSeptember 30,
2021		September 30,
2020
Balance as of beginning of fiscal year$111.8 $78.7 
Recognized in current year102.0 121.5 
Amounts in beginning balance reclassified to revenue(74.4)(42.9)
Current year amounts reclassified to revenue(46.2)(65.6)
Divestiture(0.8)— 
Other0.2 — 
Reclassification to/from long-term and contract asset(5.9)6.1 
Balance as of period end$86.7 $97.8 
Long-termSeptember 30,
2021		September 30,
2020
Balance as of beginning of fiscal year$32.0 $25.9 
Recognized in current year45.4 12.9 
Amounts in beginning balance reclassified to revenue(0.8)(0.8)
Current year amounts reclassified to revenue— — 
Other— — 
Reclassification to/from short-term(2.6)(6.1)
Balance as of period end$74.0 $31.9