XML 82 R68.htm IDEA: XBRL DOCUMENT v3.22.0.1

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 2,799.8	$ 2,982.1	$ 4,122.5
Percent of total revenue	100.00%	100.00%	100.00%
Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	96.00%	91.00%	93.00%
Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	39.00%	36.00%	39.00%
Precision Forgings, Casting and Components [Member]
Disaggregation of Revenue [Line Items]
Percent of total revenue	16.00%	14.00%	18.00%
Titanium and Titanium-based Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of total revenue	12.00%	17.00%	18.00%
Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	10.00%	9.00%	6.00%
Precision rolled strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	19.00%	15.00%	12.00%
Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of total revenue	4.00%	9.00%	7.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 1,534.9	$ 1,809.1	$ 2,454.6
China
Disaggregation of Revenue [Line Items]
Revenue	370.4	315.5	355.6
Germany
Disaggregation of Revenue [Line Items]
Revenue	121.3	125.4	219.3
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	153.9	126.5	173.8
Rest of World
Disaggregation of Revenue [Line Items]
Revenue	466.2	516.5	811.6
Hong Kong
Disaggregation of Revenue [Line Items]
Revenue	77.2	20.2	1.3
CANADA
Disaggregation of Revenue [Line Items]
Revenue	75.9	68.9	106.3
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	1,132.7	1,360.0	2,130.4
Energy*
Disaggregation of Revenue [Line Items]
Revenue	591.9	618.9	796.9
Automotive
Disaggregation of Revenue [Line Items]
Revenue	305.1	263.2	296.6
Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	153.1	159.2	205.8
Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	122.2	142.0	195.0
Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	131.5	119.1	172.4
Electronic Devices Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	215.1	177.7	163.2
Other
Disaggregation of Revenue [Line Items]
Revenue	148.2	142.0	162.2
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3,010.7	3,182.9	4,446.4
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	$ 1,248.3	$ 1,235.4	$ 2,054.2
Percent of total revenue	100.00%	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	100.00%	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	43.00%	38.00%	38.00%
Operating Segments | High Performance Materials & Components | Precision Forgings, Casting and Components [Member]
Disaggregation of Revenue [Line Items]
Percent of total revenue	38.00%	34.00%	36.00%
Operating Segments | High Performance Materials & Components | Titanium and Titanium-based Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of total revenue	19.00%	28.00%	26.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Precision rolled strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 571.3	$ 641.0	$ 1,042.6
Operating Segments | High Performance Materials & Components | China
Disaggregation of Revenue [Line Items]
Revenue	49.5	31.0	93.9
Operating Segments | High Performance Materials & Components | Germany
Disaggregation of Revenue [Line Items]
Revenue	74.1	76.6	147.2
Operating Segments | High Performance Materials & Components | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	136.7	101.9	156.7
Operating Segments | High Performance Materials & Components | Rest of World
Disaggregation of Revenue [Line Items]
Revenue	210.9	266.8	486.5
Operating Segments | High Performance Materials & Components | Hong Kong
Disaggregation of Revenue [Line Items]
Revenue	76.3	19.0	0.9
Operating Segments | High Performance Materials & Components | CANADA
Disaggregation of Revenue [Line Items]
Revenue	36.3	28.3	50.7
Operating Segments | High Performance Materials & Components | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	835.5	946.9	1,624.1
Operating Segments | High Performance Materials & Components | Energy*
Disaggregation of Revenue [Line Items]
Revenue	178.3	106.2	153.6
Operating Segments | High Performance Materials & Components | Automotive
Disaggregation of Revenue [Line Items]
Revenue	8.7	5.5	10.5
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	0.1	0.0	0.3
Operating Segments | High Performance Materials & Components | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	24.0	18.6	42.5
Operating Segments | High Performance Materials & Components | Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	60.3	47.7	85.4
Operating Segments | High Performance Materials & Components | Electronic Devices Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	1.2	0.9	0.5
Operating Segments | High Performance Materials & Components | Other
Disaggregation of Revenue [Line Items]
Revenue	47.0	38.8	61.6
Operating Segments | Advanced Alloys & Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,762.4	$ 1,947.5	$ 2,392.2
Percent of total revenue	100.00%	100.00%	100.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of total revenue	93.00%	86.00%	86.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	37.00%	35.00%	41.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision Forgings, Casting and Components [Member]
Disaggregation of Revenue [Line Items]
Percent of total revenue	0.00%	0.00%	0.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Titanium and Titanium-based Alloys [Member]
Disaggregation of Revenue [Line Items]
Percent of total revenue	6.00%	11.00%	11.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of total revenue	17.00%	15.00%	11.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision rolled strip
Disaggregation of Revenue [Line Items]
Percent of total revenue	33.00%	25.00%	23.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of total revenue	7.00%	14.00%	14.00%
Operating Segments | Advanced Alloys & Solutions [Member] | United States
Disaggregation of Revenue [Line Items]
Revenue	$ 963.6	$ 1,168.1	$ 1,412.0
Operating Segments | Advanced Alloys & Solutions [Member] | China
Disaggregation of Revenue [Line Items]
Revenue	320.9	284.5	261.7
Operating Segments | Advanced Alloys & Solutions [Member] | Germany
Disaggregation of Revenue [Line Items]
Revenue	47.2	48.8	72.1
Operating Segments | Advanced Alloys & Solutions [Member] | UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenue	17.2	24.6	17.1
Operating Segments | Advanced Alloys & Solutions [Member] | Rest of World
Disaggregation of Revenue [Line Items]
Revenue	255.3	249.7	325.1
Operating Segments | Advanced Alloys & Solutions [Member] | Hong Kong
Disaggregation of Revenue [Line Items]
Revenue	0.9	1.2	0.4
Operating Segments | Advanced Alloys & Solutions [Member] | CANADA
Disaggregation of Revenue [Line Items]
Revenue	39.6	40.6	55.6
Operating Segments | Advanced Alloys & Solutions [Member] | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue	297.2	413.1	506.3
Operating Segments | Advanced Alloys & Solutions [Member] | Energy*
Disaggregation of Revenue [Line Items]
Revenue	413.6	512.7	643.3
Operating Segments | Advanced Alloys & Solutions [Member] | Automotive
Disaggregation of Revenue [Line Items]
Revenue	296.4	257.7	286.1
Operating Segments | Advanced Alloys & Solutions [Member] | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue	153.0	159.2	205.5
Operating Segments | Advanced Alloys & Solutions [Member] | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue	98.2	123.4	152.5
Operating Segments | Advanced Alloys & Solutions [Member] | Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	71.2	71.4	87.0
Operating Segments | Advanced Alloys & Solutions [Member] | Electronic Devices Market [Member]
Disaggregation of Revenue [Line Items]
Revenue	213.9	176.8	162.7
Operating Segments | Advanced Alloys & Solutions [Member] | Other
Disaggregation of Revenue [Line Items]
Revenue	101.2	103.2	100.6
External Customers | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2,799.8	2,982.1	4,122.5
External Customers | Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue	1,155.1	1,164.6	1,978.5
External Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 1,644.7	$ 1,817.5	$ 2,144.0

X

- Definition

Revenue from Contract with Customer, Excluding Assessed Tax, Percentage of Revenue

+ References

No definition available.

+ Details

Name:	ati_RevenuefromContractwithCustomerExcludingAssessedTaxPercentageofRevenue
Namespace Prefix:	ati_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=ati_HighValueProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ati_NickelbasedAlloysandSpecialtyAlloysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ati_PrecisionForgingsCastingandComponentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ati_TitaniumandTitaniumbasedAlloysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ati_ZirconiumandRelatedAlloysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ati_PrecisionRolledStripProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=ati_StandardStainlessProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_DE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=ati_RestOfWorldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_HK
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_AerospaceandDefenseMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_EnergyMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_AutomotiveMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_FoodEquipmentandAppliancesMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_ConstructionMiningMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_MedicalMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_ElectronicsMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ContractWithCustomerSalesChannelAxis=ati_OtherMarketMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ati_HighPerformanceMaterialsComponentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=ati_AdvancedAlloysSolutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MajorCustomersAxis=ati_ExternalCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: