10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended June 30, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Transition Period From                      to                     

Commission File Number 1-12001

 ALLEGHENY TECHNOLOGIES INCORPORATED

(Exact name of registrant as specified in its charter)

Delaware		25-1792394
(State or other jurisdiction of		(I.R.S. Employer
incorporation or organization)		Identification No.)
1000 Six PPG Place
Pittsburgh,	Pennsylvania	15222-5479
(Address of Principal Executive Offices)		(Zip Code)

(412) 394-2800

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common stock, par value $0.10	ATI	New York Stock Exchange

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  ☒    No  ☐

Indicate by check mark whether the Registrant submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ☐    No  ☒

At July 16, 2021, the registrant had outstanding 127,245,632 shares of its Common Stock.

ALLEGHENY TECHNOLOGIES INCORPORATED

SEC FORM 10-Q

Quarter Ended June 30, 2021

INDEX

	Page No.
PART I. - FINANCIAL INFORMATION
Item 1. Financial Statements
Consolidated Balance Sheets	1
Consolidated Statements of Operations	2
Consolidated Statements of Comprehensive Income (Loss)	3
Consolidated Statements of Cash Flows	4
Statements of Changes in Consolidated Equity	5
Notes to Consolidated Financial Statements	6
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	25
Item 3. Quantitative and Qualitative Disclosures About Market Risk	43
Item 4. Controls and Procedures	44
PART II. - OTHER INFORMATION
Item 1. Legal Proceedings	45
Item 1A. Risk Factors	45
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	46
Item 6. Exhibits	46
SIGNATURES	47

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

Allegheny Technologies Incorporated and Subsidiaries

Consolidated Balance Sheets

(In millions, except share and per share amounts)

(Current period unaudited)

	June 30, 2021		December 31, 2020
ASSETS
Current Assets:
Cash and cash equivalents	$	472.5	$	645.9
Accounts receivable, net	362.2		345.8
Short-term contract assets	52.3		38.9
Inventories, net	1,059.0		997.1
Prepaid expenses and other current assets	50.5		38.3
Total Current Assets	1,996.5		2,066.0
Property, plant and equipment, net	1,486.3		1,469.2
Goodwill	241.9		240.7
Other assets	249.3		259.0
Total Assets	$	3,974.0	$	4,034.9
LIABILITIES AND EQUITY
Current Liabilities:
Accounts payable	$	265.8	$	290.6
Short-term contract liabilities	103.8		111.8
Short-term debt and current portion of long-term debt	19.3		17.8
Other current liabilities	210.2		233.1
Total Current Liabilities	599.1		653.3
Long-term debt	1,602.2		1,550.0
Accrued postretirement benefits	317.1		326.7
Pension liabilities	629.4		673.6
Other long-term liabilities	220.1		189.9
Total Liabilities	3,367.9		3,393.5
Equity:
ATI Stockholders’ Equity:
Preferred stock, par value $0.10: authorized-50,000,000 shares; issued-none	—		—
Common stock, par value $0.10: authorized-500,000,000 shares; issued-127,471,322 shares at June 30, 2021 and 126,820,440 shares at December 31, 2020; outstanding-127,243,908 shares at June 30, 2021 and 126,817,768 shares at December 31, 2020	12.7		12.7
Additional paid-in capital	1,587.5		1,625.5
Retained earnings	53.8		106.5
Treasury stock: 227,414 shares at June 30, 2021 and 2,672 shares at December 31, 2020	(4.7)		—
Accumulated other comprehensive loss, net of tax	(1,176.3)		(1,223.6)
Total ATI stockholders’ equity	473.0		521.1
Noncontrolling interests	133.1		120.3
Total Equity	606.1		641.4
Total Liabilities and Equity	$	3,974.0	$	4,034.9

The accompanying notes are an integral part of these statements.

1

Allegheny Technologies Incorporated and Subsidiaries

Consolidated Statements of Operations

(In millions, except per share amounts)

(Unaudited)

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Sales	$	616.2	$	770.3	$	1,308.7	$	1,725.8
Cost of sales	573.5		695.6		1,180.2		1,516.3
Gross profit	42.7		74.7		128.5		209.5
Selling and administrative expenses	60.2		44.4		114.2		102.8
Impairment of goodwill	—		287.0		—		287.0
Restructuring charges (credits)	(6.2)		16.7		(6.2)		24.7
Operating income (loss)	(11.3)		(273.4)		20.5		(205.0)
Nonoperating retirement benefit expense	(6.8)		(11.2)		(13.6)		(22.4)
Interest expense, net	(23.7)		(21.7)		(47.1)		(43.6)
Debt extinguishment charge	—		(21.5)		—		(21.5)
Other income (expense), net	1.4		0.5		2.9		(0.4)
Loss before income taxes	(40.4)		(327.3)		(37.3)		(292.9)
Income tax provision	4.0		92.6		9.5		103.4
Net loss	(44.4)		(419.9)		(46.8)		(396.3)
Less: Net income attributable to noncontrolling interests	4.8		2.7		10.3		5.2
Net loss attributable to ATI	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Basic net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)
Diluted net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)

The accompanying notes are an integral part of these statements.

2

Allegheny Technologies Incorporated and Subsidiaries

Consolidated Statements of Comprehensive Income (Loss)

(In millions)

(Unaudited)

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Net loss	$	(44.4)	$	(419.9)	$	(46.8)	$	(396.3)
Currency translation adjustment
Unrealized net change arising during the period	7.0		14.2		2.2		(9.2)
Derivatives
Net derivatives gain (loss) on hedge transactions	7.0		2.0		7.4		(10.3)
Reclassification to net loss of net realized (gain) loss	(1.5)		4.2		(3.2)		6.0
Income taxes on derivative transactions	—		2.5		—		—
Total	5.5		3.7		4.2		(4.3)
Postretirement benefit plans
Actuarial loss
Amortization of net actuarial loss	22.2		21.3		44.4		42.6
Prior service cost
Amortization to net loss of net prior service credits	(0.5)		(0.8)		(1.0)		(1.5)
Income taxes on postretirement benefit plans	—		(4.9)		—		—
Total	21.7		25.4		43.4		41.1
Other comprehensive income, net of tax	34.2		43.3		49.8		27.6
Comprehensive income (loss)	(10.2)		(376.6)		3.0		(368.7)
Less: Comprehensive income attributable to noncontrolling interests	6.7		2.2		12.8		3.9
Comprehensive loss attributable to ATI	$	(16.9)	$	(378.8)	$	(9.8)	$	(372.6)

The accompanying notes are an integral part of these statements.

3

Allegheny Technologies Incorporated and Subsidiaries

Consolidated Statements of Cash Flows

(In millions)

(Unaudited)

	Six months ended June 30,
	2021		2020
Operating Activities:
Net loss	$	(46.8)	$	(396.3)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	72.4		72.9
Deferred taxes	1.0		98.1
Impairment of goodwill	—		287.0
Debt extinguishment charge	—		21.5
Net gains from disposal of property, plant and equipment	(2.4)		(2.5)
Changes in operating assets and liabilities:
Inventories	(61.9)		51.8
Accounts receivable	(16.4)		70.5
Accounts payable	(24.9)		(245.4)
Retirement benefits	(15.2)		(17.0)
Accrued liabilities and other	(8.4)		45.0
Cash used in operating activities	(102.6)		(14.4)
Investing Activities:
Purchases of property, plant and equipment	(61.4)		(66.0)
Proceeds from disposal of property, plant and equipment	2.7		3.2
Other	(0.1)		1.0
Cash used in investing activities	(58.8)		(61.8)
Financing Activities:
Borrowings on long-term debt	0.7		385.0
Payments on long-term debt and finance leases	(7.1)		(207.2)
Net borrowings (payments) under credit facilities	(0.9)		0.7
Purchase of convertible note capped call	—		(19.0)
Debt issuance costs	—		(8.1)
Debt extinguishment charge	—		(19.1)
Shares repurchased for income tax withholding on share-based compensation and other	(4.7)		(7.8)
Cash provided by (used in) financing activities	(12.0)		124.5
Increase (decrease) in cash and cash equivalents	(173.4)		48.3
Cash and cash equivalents at beginning of period	645.9		490.8
Cash and cash equivalents at end of period	$	472.5	$	539.1

The accompanying notes are an integral part of these statements.

4

Allegheny Technologies Incorporated and Subsidiaries

Statements of Changes in Consolidated Equity

(In millions)

(Unaudited)

	ATI Stockholders
	Common Stock		Additional Paid-In Capital		Retained Earnings		Treasury Stock		Accumulated Other Comprehensive Income (Loss)		Non- controlling Interests		Total Equity
Balance, March 31, 2020	$	12.7	$	1,592.1	$	1,700.4	$	(0.8)	$	(1,216.6)	$	104.8	$	2,192.6
Net income (loss)	—		—		(422.6)		—		—		2.7		(419.9)
Other comprehensive income (loss)	—		—		—		—		43.8		(0.5)		43.3
Equity component of convertible note	—		48.7		—		—		—		—		48.7
Convertible note capped call	—		(19.0)		—		—		—		—		(19.0)
Employee stock plans	—		(4.0)		(0.2)		0.8		—		—		(3.4)
Balance, June 30, 2020	$	12.7	$	1,617.8	$	1,277.6	$	—	$	(1,172.8)	$	107.0	$	1,842.3
Balance, March 31, 2021	$	12.7	$	1,580.5	$	103.0	$	(4.7)	$	(1,208.6)	$	126.4	$	609.3
Net income (loss)	—		—		(49.2)		—		—		4.8		(44.4)
Other comprehensive income	—		—		—		—		32.3		1.9		34.2
Employee stock plans	—		7.0		—		—		—		—		7.0
Balance, June 30, 2021	$	12.7	$	1,587.5	$	53.8	$	(4.7)	$	(1,176.3)	$	133.1	$	606.1

	ATI Stockholders
	Common Stock		Additional Paid-In Capital		Retained Earnings		Treasury Stock		Accumulated Other Comprehensive Income (Loss)		Non- controlling Interests		Total Equity
Balance, December 31, 2019	$	12.7	$	1,618.0	$	1,679.3	$	(18.2)	$	(1,201.7)	$	103.1	$	2,193.2
Net income (loss)	—		—		(401.5)		—		—		5.2		(396.3)
Other comprehensive income (loss)	—		—		—		—		28.9		(1.3)		27.6
Equity component of convertible note	—		48.7		—		—		—		—		48.7
Convertible note capped call	—		(19.0)		—		—		—		—		(19.0)
Employee stock plans	—		(29.9)		(0.2)		18.2		—		—		(11.9)
Balance, June 30, 2020	$	12.7	$	1,617.8	$	1,277.6	$	—	$	(1,172.8)	$	107.0	$	1,842.3
Balance, December 31, 2020	$	12.7	$	1,625.5	$	106.5	$	—	$	(1,223.6)	$	120.3	$	641.4
Net income (loss)	—		—		(57.1)		—		—		10.3		(46.8)
Other comprehensive income	—		—		—		—		47.3		2.5		49.8
Cumulative effect of adoption of new accounting standard	—		(49.8)		4.4		—		—		—		(45.4)
Employee stock plans	—		11.8		—		(4.7)		—		—		7.1
Balance, June 30, 2021	$	12.7	$	1,587.5	$	53.8	$	(4.7)	$	(1,176.3)	$	133.1	$	606.1

The accompanying notes are an integral part of these statements.

5

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Unaudited

Note 1. Accounting Policies

The interim consolidated financial statements include the accounts of Allegheny Technologies Incorporated and its subsidiaries. Unless the context requires otherwise, “Allegheny Technologies,” “ATI” and “the Company” refer to Allegheny Technologies Incorporated and its subsidiaries.

These unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by U.S. generally accepted accounting principles for complete financial statements. In management’s opinion, all adjustments (which include only normal recurring adjustments) considered necessary for a fair presentation have been included. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2020 Annual Report on Form 10-K. The results of operations for these interim periods are not necessarily indicative of the operating results for any future period. The December 31, 2020 financial information has been derived from the Company’s audited consolidated financial statements.

New Accounting Pronouncements Adopted

In August 2020, the Financial Accounting Standards Board issued new accounting guidance related to accounting for convertible instruments. Under this new guidance, embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives, or that do not result in substantial premiums accounted for as paid-in capital. As such, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. By removing those separation models, the reported interest rate of convertible debt instruments typically will be closer to the coupon interest rate. The new guidance also addresses how convertible instruments are accounted for in the diluted earnings per share calculation, requiring the if-converted method, and requires enhanced disclosures about the terms of convertible instruments and contracts in an entity’s own equity. This new guidance is effective for the Company in fiscal year 2022, with early adoption permitted.

The Company adopted this new accounting guidance related to accounting for convertible instruments effective January 1, 2021 using the modified transition approach with the cumulative effect recognized as an adjustment to the opening balance of retained earnings. This new guidance is applicable to the Company’s 3.5% Convertible Senior Notes due 2025 (the 2025 Convertible Notes) that were issued in June 2020, for which the embedded conversion option was required to be separately accounted for as a component of stockholders’ equity. Upon adoption on January 1, 2021, long-term debt increased by $45.4 million and stockholders’ equity decreased by the same amount, representing the net impact of two adjustments: (1) the $49.8 million value of the embedded conversion, which is net of allocated offering costs, previously classified in additional paid-in capital in stockholders’ equity, and (2) a $4.4 million increase to retained earnings for the cumulative effect of adoption primarily related to the non-cash interest expense recorded in fiscal year 2020 for the amortization of the portion of the 2025 Convertible Notes allocated to stockholders’ equity. Prospectively, the reported interest expense for the 2025 Convertible Notes will no longer include the non-cash interest expense of the equity component as required under prior accounting standards and will be closer to the 3.5% cash coupon rate. There was no impact to the Company’s earnings per share calculation as it previously applied the if-converted method to the 2025 Convertible Notes given ATI’s flexibility to settle conversions of the 2025 Convertible Notes in cash, shares of ATI’s common stock or a combination thereof, at ATI’s election.

6

Note 2. 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 of the Company’s overall revenues (in millions) by global and geographical markets for the second quarters and six months ended June 30, 2021 and 2020 were as follows:

(in millions)	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Global Markets:
Aerospace & Defense	$	218.6	$	62.6	$	281.2	$	252.3	$	113.3	$	365.6
Energy*	48.6		69.7		118.3		22.8		144.7		167.5
Automotive	1.4		66.6		68.0		1.0		49.8		50.8
Electronics	0.2		43.1		43.3		0.2		39.3		39.5
Medical	14.6		17.4		32.0		10.3		19.6		29.9
Construction/Mining	6.1		15.8		21.9		5.0		29.8		34.8
Food Equipment & Appliances	0.1		20.6		20.7		0.1		47.1		47.2
Other	11.0		19.8		30.8		9.0		26.0		35.0
Total	$	300.6	$	315.6	$	616.2	$	300.7	$	469.6	$	770.3

(in millions)	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Global Markets:
Aerospace & Defense	$	398.4	$	137.0	$	535.4	$	611.1	$	247.0	$	858.1
Energy*	79.1		188.3		267.4		46.9		291.2		338.1
Automotive	3.4		156.1		159.5		3.0		124.3		127.3
Electronics	0.5		98.4		98.9		0.5		72.2		72.7
Construction/Mining	11.2		53.2		64.4		10.3		68.1		78.4
Medical	25.8		35.2		61.0		27.3		41.2		68.5
Food Equipment & Appliances	0.1		56.0		56.1		0.1		97.5		97.6
Other	23.0		43.0		66.0		21.8		63.3		85.1
Total	$	541.5	$	767.2	$	1,308.7	$	721.0	$	1,004.8	$	1,725.8

*Includes the oil & gas, downstream processing, and specialty energy markets.

(in millions)	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Primary Geographical Market:
United States	$	157.6	$	172.1	$	329.7	$	166.2	$	311.0	$	477.2
Asia	40.6		94.7		135.3		27.6		91.1		118.7
Europe	86.3		27.1		113.4		92.0		32.4		124.4
Canada	9.3		10.7		20.0		5.1		11.1		16.2
South America, Middle East and other	6.8		11.0		17.8		9.8		24.0		33.8
Total	$	300.6	$	315.6	$	616.2	$	300.7	$	469.6	$	770.3

7

(in millions)	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Primary Geographical Market:
United States	$	285.9	$	443.7	$	729.6	$	393.5	$	689.8	$	1,083.3
Asia	60.7		217.3		278.0		52.7		185.3		238.0
Europe	165.4		61.1		226.5		225.5		70.0		295.5
Canada	17.5		19.8		37.3		16.7		21.5		38.2
South America, Middle East and other	12.0		25.3		37.3		32.6		38.2		70.8
Total	$	541.5	$	767.2	$	1,308.7	$	721.0	$	1,004.8	$	1,725.8

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 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 conversion service sales in the AA&S segment are excluded from this presentation.

	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Products and Services:
High-Value Products
Nickel-based alloys and specialty alloys	45	%	21	%	33	%	36	%	32	%	34	%
Precision rolled strip products	—	%	39	%	19	%	—	%	20	%	12	%
Precision forgings, castings and components	36	%	—	%	18	%	35	%	—	%	14	%
Titanium and titanium-based alloys	19	%	6	%	13	%	29	%	13	%	19	%
Zirconium and related alloys	—	%	24	%	12	%	—	%	14	%	8	%
Total High-Value Products	100	%	90	%	95	%	100	%	79	%	87	%
Standard Products
Standard stainless products	—	%	10	%	5	%	—	%	21	%	13	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Products and Services:
High-Value Products
Nickel-based alloys and specialty alloys	41	%	25	%	32	%	38	%	28	%	34	%
Precision rolled strip products	—	%	35	%	20	%	—	%	18	%	12	%
Precision forgings, castings and components	39	%	—	%	17	%	35	%	—	%	15	%
Titanium and titanium-based alloys	20	%	6	%	12	%	27	%	10	%	18	%
Zirconium and related alloys	—	%	19	%	10	%	—	%	12	%	8	%
Total High-Value Products	100	%	85	%	91	%	100	%	68	%	87	%
Standard Products
Standard stainless products	—	%	15	%	9	%	—	%	32	%	13	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

The Company maintained a backlog of confirmed orders totaling $1.6 billion and $1.5 billion at June 30, 2021 and 2020, respectively. Due to the structure of the Company’s long-term agreements, approximately 75% of this backlog at June 30, 2021 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.

8

Contract balances

As of June 30, 2021 and December 31, 2020, accounts receivable with customers were $366.1 million and $350.1 million, respectively. The following represents the rollforward of accounts receivable - reserve for doubtful accounts and contract assets and liabilities for the six months ended June 30, 2021 and 2020:

(in millions)
Accounts Receivable - Reserve for Doubtful Accounts	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	4.3	$	4.6
Expense to increase the reserve	—		0.2
Write-off of uncollectible accounts	(0.4)		(0.3)
Balance as of period end	$	3.9	$	4.5

(in millions)
Contract Assets
Short-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	38.9	$	38.5
Recognized in current year	48.9		37.5
Reclassified to accounts receivable	(30.4)		(34.5)
Impairment	—		—
Reclassification to/from long-term and contract liability	(5.1)		0.1
Balance as of period end	$	52.3	$	41.6
Long-term	June 30, 2021		June 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-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	111.8	$	78.7
Recognized in current year	77.9		97.9
Amounts in beginning balance reclassified to revenue	(63.9)		(33.9)
Current year amounts reclassified to revenue	(18.7)		(38.5)
Other	—		(0.2)
Reclassification to/from long-term and contract asset	(3.3)		5.8
Balance as of period end	$	103.8	$	109.8
Long-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	32.0	$	25.9
Recognized in current year	41.0		12.4
Amounts in beginning balance reclassified to revenue	(0.5)		(0.5)
Current year amounts reclassified to revenue	—		—
Other	—		—
Reclassification to/from short-term	(1.8)		(5.8)
Balance as of period end	$	70.7	$	32.0

Contract costs for obtaining and fulfilling a contract were $5.5 million and $5.4 million as of June 30, 2021 and December 31, 2020, respectively, and are reported in other long-term assets on the consolidated balance sheet. Contract cost amortization expense for the three and six months ended June 30, 2021 was $0.3 million and $0.5 million, respectively. Contract cost amortization expense for the three and six months ended June 30, 2020 was $0.4 million and $0.7 million, respectively.

9

Note 3. Inventories

Inventories at June 30, 2021 and December 31, 2020 were as follows (in millions):

	June 30, 2021		December 31, 2020
Raw materials and supplies	$	206.3	$	207.6
Work-in-process	782.5		690.7
Finished goods	143.9		181.6
Total inventories at current cost	1,132.7		1,079.9
Adjustment from current cost to LIFO cost basis	29.9		44.1
Inventory valuation reserves	(103.6)		(126.9)
Total inventories, net	$	1,059.0	$	997.1

Inventories are stated at the lower of cost (last-in, first-out (LIFO), first-in, first-out (FIFO), and average cost methods) or market. Most of the Company’s inventory is valued utilizing the LIFO costing methodology. Inventory of the Company’s non-U.S. operations is valued using average cost or FIFO methods. Due to deflationary impacts primarily related to raw materials, the carrying value of the Company’s inventory as valued on LIFO exceeds current replacement cost, and based on a lower of cost or market value analysis, the Company maintains net realizable value (NRV) inventory valuation reserves to adjust the carrying value of LIFO inventory to current replacement cost. These NRV reserves were $29.9 million at June 30, 2021 and $44.1 million at December 31, 2020. Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):

	Six months ended June 30,
	2021		2020
LIFO benefit (charge)	$	(14.1)	$	14.0
NRV benefit (charge)	14.1		(14.0)
Net cost of sales impact	$	—	$	—

Note 4. Property, Plant and Equipment

Property, plant and equipment at June 30, 2021 and December 31, 2020 was as follows (in millions):

	June 30, 2021		December 31, 2020
Land	$	34.9	$	34.8
Buildings	574.6		564.7
Equipment and leasehold improvements	2,791.8		2,736.9
	3,401.3		3,336.4
Accumulated depreciation and amortization	(1,915.0)		(1,867.2)
Total property, plant and equipment, net	$	1,486.3	$	1,469.2

The construction in progress portion of property, plant and equipment at June 30, 2021 was $244.9 million. Capital expenditures on the consolidated statement of cash flows for the period ended June 30, 2021 exclude $3.4 million of completion payments that were included in property, plant and equipment and accrued at June 30, 2021.

Note 5. Joint Ventures

The financial results of majority-owned joint ventures are consolidated into the Company’s operating results and financial position, with the minority ownership interest recognized in the consolidated statements of operations as net income attributable to noncontrolling interests, and as equity attributable to the noncontrolling interests within total stockholders’ equity. Investments in which the Company exercises significant influence, but which it does not control (generally a 20% to 50% ownership interest), are accounted for under the equity method of accounting.

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Majority-Owned Joint Ventures

STAL:

The Company has a 60% interest in the Chinese joint venture known as STAL. The remaining 40% interest in STAL is owned by China Baowu Steel Group Corporation Limited, a state authorized investment company whose equity securities are publicly traded in the People’s Republic of China. STAL is part of ATI’s AA&S segment and manufactures Precision Rolled Strip stainless products mainly for the electronics and automotive markets located in Asia. Cash and cash equivalents held by STAL as of June 30, 2021 were $47.2 million.

Next Gen Alloys LLC:

The Company has a 51% interest in Next Gen Alloys LLC, a joint venture with GE Aviation for the development of a new meltless titanium alloy powder manufacturing technology. The titanium alloy powders are being developed for use in additive manufacturing applications, including 3D printing. Cash and cash equivalents held by this joint venture as of June 30, 2021 were $1.7 million.

Equity Method Joint Ventures

A&T Stainless:

The Company has a 50% interest in A&T Stainless, a joint venture with an affiliate company of Tsingshan Group (Tsingshan) to produce 60-inch wide stainless sheet products for sale in North America. Tsingshan purchased its 50% joint venture interest in A&T Stainless in 2018 for $17.5 million, of which $12.0 million has been received by ATI. The A&T Stainless operations included the Company’s previously-idled direct roll and pickle (DRAP) facility in Midland, PA. ATI provided hot-rolling conversion services to A&T Stainless using the AA&S segment’s Hot-Rolling and Processing Facility. ATI accounts for the A&T Stainless joint venture under the equity method of accounting.

In March 2018, ATI filed for an exclusion from the Section 232 tariffs on behalf of A&T Stainless, which imports semi-finished stainless slab products from Indonesia. In April 2019, the Company learned that this exclusion request was denied by the U.S. Department of Commerce. ATI filed new requests on behalf of A&T Stainless for exclusion from the Section 232 tariffs in October 2019. These requests were denied by the U.S. Department of Commerce in the second quarter of 2020, and the 25% tariff remains in place.

Due to repeated tariff exclusion denials, the DRAP facility was idled in an orderly shut down process that was completed in the third quarter of 2020. ATI’s share of A&T Stainless results were losses of $0.4 million and $0.9 million for the three and six months ended June 30, 2021, respectively, and losses of $4.6 million and $8.5 million for the three and six months ended June 30, 2020, respectively, which is included within other income/expense, net, on the consolidated statements of operations. These equity method results are reported in the AA&S segment, with the exception of ATI’s $2.4 million share of a charge recorded by A&T Stainless for termination benefits during the second quarter ended June 30, 2020.

As of June 30, 2021 and December 31, 2020, ATI had net receivables for working capital advances and administrative services from A&T Stainless of $13.2 million and $14.0 million, respectively. For the June 30, 2021 balance of net receivables, $0.5 million was reported in prepaid expenses and other current assets and $12.7 million in other long-term assets on the consolidated balance sheet, while for December 31, 2020, $0.5 million was reported in prepaid expenses and other current assets and $13.5 million in other long-term assets. In addition, ATI evaluated the collectability of its remaining $5.5 million receivable from Tsingshan, which is reported in other long-term assets on the consolidated balance sheet, and concluded that no impairment or loss in expected value exists at this time.

Uniti:

ATI has a 50% interest in the industrial titanium joint venture known as Uniti, with the remaining 50% interest held by VSMPO, a Russian producer of titanium, aluminum, and specialty steel products. Uniti is accounted for under the equity method of accounting. ATI’s share of Uniti’s income was $0.4 million and $0.9 million for the three and six months ended June 30, 2021, respectively, and $0.3 million and $0.5 million for the three and six months ended June 30, 2020, respectively, which is included in the AA&S segment’s operating results, and within other income/expense, net on the consolidated statements of operations.

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Note 6. Supplemental Financial Statement Information

Other income (expense), net for the three and six months ended June 30, 2021 and 2020 was as follows:

(in millions)	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Rent and royalty income	$	0.2	$	0.2	$	0.5	$	0.5
Gains from disposal of property, plant and equipment, net	1.2		—		2.4		2.5
Net equity loss on joint ventures (See Note 5)	—		(1.9)		—		(5.6)
Joint venture restructuring charges (See Note 5)	—		(2.4)		—		(2.4)
Adjustment to indemnification for conditional ARO costs	—		4.3		—		4.3
Other	—		0.3		—		0.3
Total other income (expense), net	$	1.4	$	0.5	$	2.9	$	(0.4)

Gains from disposal of property, plant and equipment, net for the six months ended June 30, 2020 included a $2.5 million gain on the sale of certain oil and gas rights. This cash gain was reported as an investing activity on the consolidated statement of cash flows for the six months ended June 30, 2020 and is excluded from segment operating results.

In the second quarter of 2020, the Company finalized a settlement agreement for an indemnity claim concerning a conditional asset retirement obligation (ARO) with the buyer of a formerly-owned business and as a result, the Company reduced ARO reserves by $4.3 million.

Restructuring

Restructuring charges for the second quarter and six months ended June 30, 2021 were a net credit of $6.2 million, primarily related to $6.9 million for lowered severance-related reserves for approximately 200 employees based on changes in planned operating rates and revised workforce reduction estimates. This was offset by $0.7 million of other costs related to facility idlings.

For the second quarter and six months ended June 30, 2020, the Company recorded restructuring charges of $16.7 million and $24.7 million, respectively, which are presented as restructuring charges in the consolidated statements of operations. These charges were a result of workforce right-sizing actions to better match the Company’s cost structure to expected demand, primarily as a result of economic challenges created by the COVID-19 pandemic. For the second quarter of 2020, these charges are comprised of severance obligations for the elimination of approximately 550 positions for both involuntary reductions and voluntary retirement incentive programs related to both salary and hourly employees in the HPMC segment. For the six months ended June 30, 2020, these charges also include severance obligations for the reduction of approximately 90 positions for a voluntary retirement incentive program completed in the first quarter of 2020 for eligible salaried employees.

Restructuring reserves for severance cost activity is as follows:

	Severance and Employee
	Benefit Costs
Balance at December 31, 2020	$	43.4
Adjustments	(6.9)
Payments	(10.2)
Balance at June 30, 2021	$	26.3

The $26.3 million restructuring reserve balance at June 30, 2021 includes $18.2 million recorded in other current liabilities and $8.1 million recorded in other long-term liabilities on the consolidated balance sheet.

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Note 7. Debt

Debt at June 30, 2021 and December 31, 2020 was as follows (in millions): 

	June 30, 2021		December 31, 2020
Allegheny Technologies 5.875% Notes due 2023 (a)	$	500.0	$	500.0
Allegheny Technologies 5.875% Notes due 2027	350.0		350.0
Allegheny Technologies 3.5% Convertible Senior Notes due 2025	291.4		291.4
Allegheny Technologies 4.75% Convertible Senior Notes due 2022	84.2		84.2
Allegheny Ludlum 6.95% Debentures due 2025 (b)	150.0		150.0
Term Loan due 2024	200.0		200.0
U.S. revolving credit facility	—		—
Foreign credit facilities	4.6		5.5
Finance leases and other	55.5		48.0
Debt issuance costs	(14.2)		(14.5)
Equity component of convertible debt	—		(46.8)
Total debt	1,621.5		1,567.8
Short-term debt and current portion of long-term debt	19.3		17.8
Total long-term debt	$	1,602.2	$	1,550.0

(a) Bearing interest at 7.875% effective February 15, 2016.

(b) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed

by ATI.

Revolving Credit Facility

The Company has an Asset Based Lending (ABL) Credit Facility, which is collateralized by the accounts receivable and inventory of the Company’s domestic operations. The ABL facility, which matures in September 2024, includes a $500 million revolving credit facility, a letter of credit sub-facility of up to $200 million, and a $200 million term loan (Term Loan). The Term Loan has an interest rate of 2.0% plus a LIBOR spread and can be prepaid in increments of $25 million if certain minimum liquidity conditions are satisfied. In addition, the Company has the right to request an increase of up to $200 million in the maximum amount available under the revolving credit facility for the duration of the ABL. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed interest rate. The swap matures in June 2024.

The applicable interest rate for revolving credit borrowings under the ABL facility includes interest rate spreads based on available borrowing capacity that range between 1.25% and 1.75% for LIBOR-based borrowings and between 0.25% and 0.75% for base rate borrowings. The ABL facility contains a financial covenant whereby the Company must maintain a fixed charge coverage ratio of not less than 1.00:1.00 after an event of default has occurred and is continuing or if the undrawn availability under the ABL revolving credit portion of the facility is less than the greater of (i) $87.5 million, calculated as 12.5% of the then applicable maximum advance amount under the revolving credit portion of the ABL and the outstanding Term Loan balance, or (ii) $62.5 million. The Company does not meet this fixed charge coverage ratio at June 30, 2021. As a result, the Company is unable to access 12.5%, or $87.5 million, of the ABL facility until it meets the ratio. Additionally, the Company must demonstrate minimum liquidity, as calculated in accordance with the terms of the ABL facility, during the 90-day period immediately preceding the stated maturity date of the 4.75% Convertible Notes due 2022 and the 5.875% Notes due 2023. The ABL also contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Company’s ability to incur additional indebtedness or liens or to enter into investments, mergers and acquisitions, dispositions of assets and transactions with affiliates, some of which are more restrictive, at any time during the term of the ABL when the Company’s fixed charge coverage ratio is less than 1.00:1.00 and its undrawn availability under the revolving portion of the ABL is less than the greater of (a) $150 million or (b) 30% of the sum of the maximum advance amount under the revolving credit portion of the ABL and the outstanding Term Loan balance.

As of June 30, 2021, there were no outstanding borrowings under the revolving portion of the ABL facility, and $42.8 million was utilized to support the issuance of letters of credit. There were no average revolving credit borrowings under the ABL facility for the first six months of 2021. There were average revolving credit borrowings of $58 million bearing an average annual interest rate of 2.2% under the ABL facility for the first six months of 2020.

13

2025 Convertible Notes

In 2020, the Company issued $291.4 million aggregate principal amount of 2025 Convertible Notes. The Company used a portion of the net proceeds from the offering of the 2025 Convertible Notes to repurchase $203.2 million aggregate principal amount of its outstanding 2022 Convertible Notes, resulting in a $21.5 million debt extinguishment charge. The Company also used the net proceeds of the offering of the 2025 Convertible Notes to pay the cost of capped call transactions, described below, which was recorded as a reduction to additional paid-in-capital in stockholders’ equity on the consolidated balance sheet. The remainder of the net proceeds from the offering is being used for general corporate purposes.

The 2025 Convertible Notes have a 3.5% cash coupon rate that is payable semi-annually in arrears on each June 15 and December 15. Including amortization of deferred issuance costs, the effective interest rate is 4.2% for the first six months ended June 30, 2021. Remaining deferred issuance costs were $7.4 million and $8.2 million at June 30, 2021 and December 31, 2020, respectively. Interest expense on the 2025 Convertible Notes was as follows:

	Three months ended June 30,		Six months ended June 30,
(in millions)	2021		2021
Contractual coupon rate	$	2.5	$	5.1
Amortization of debt issuance costs	0.4		0.8
Total interest expense	$	2.9	$	5.9

The Company does not have the right to redeem the 2025 Convertible Notes prior to June 15, 2023. On or after June 15, 2023 and prior to the 41st scheduled trading day immediately preceding the maturity date, the Company may redeem all or any portion of the 2025 Convertible Notes, at its option, at a redemption price equal to 100% of the principal amount thereof, plus any accrued and unpaid interest, if the last reported sale price of ATI’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on the trading day immediately preceding the date on which ATI provides written notice of redemption.

The initial conversion rate for the 2025 Convertible Notes is 64.5745 shares of ATI common stock per $1,000 principal amount of the 2025 Convertible Notes, equivalent to an initial conversion price of approximately $15.49 per share (18.8 million shares). Prior to the close of business on the business day immediately preceding March 15, 2025, the 2025 Convertible Notes will be convertible at the option of the holders of 2025 Convertible Notes only upon the satisfaction of specified conditions and during certain periods. Thereafter, until the close of business on the second scheduled trading day immediately preceding the maturity date, the 2025 Convertible Notes will be convertible at the option of holders of 2025 Convertible Notes at any time regardless of these conditions. Conversions of the 2025 Convertible Notes may be settled in cash, shares of ATI’s common stock or a combination thereof, at ATI’s election.

As a result of this flexible settlement feature of the 2025 Convertible Notes, the embedded conversion option was required to be separately accounted for as a component of stockholders’ equity. The value of the embedded conversion option was determined to be $51.4 million based on the estimated fair value of comparable senior unsecured debt without the conversion feature, using an income approach of expected present value. During the 2020 fiscal year, the equity component was amortized as additional non-cash interest expense, commonly referred to as phantom yield, over the term of the 2025 Convertible Notes using the effective interest method. As a result, as of December 31, 2020, $49.8 million of the 2025 Convertible Notes was recorded in additional paid-in-capital in stockholders’ equity ($51.4 million of the gross $291.4 million, net of $1.6 million of allocated offering costs). Due to the non-cash phantom yield and including debt issue cost amortization, the 2025 Convertible Notes had reported interest expense in 2020 at an 8.4% rate, higher than the 3.5% cash coupon rate. Effective January 1, 2021, ATI early-adopted new accounting guidance as discussed in Note 1 that eliminated the equity component classification of the embedded conversion option, as well as the phantom yield portion of interest expense on a prospective basis. Upon adoption on January 1, 2021, long-term debt increased by $45.4 million, representing the $46.8 million equity component of convertible debt as of December 31, 2020 in the above table, net of reclassified debt issue costs.

ATI entered into privately negotiated capped call transactions with certain of the initial purchasers of the 2025 Convertible Notes or their respective affiliates (collectively, the Counterparties). The capped call transactions are expected generally to reduce potential dilution to ATI’s common stock upon any conversion of the 2025 Convertible Notes and/or offset any cash payments ATI is required to make in excess of the principal amount of converted 2025 Convertible Notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. The cap price of the capped call transactions initially is approximately $19.76 per share, and is subject to adjustments under the terms of the capped call transactions.

14

2022 Convertible Notes

As of June 30, 2021, the Company had $84.2 million aggregate principal amount of the 2022 Convertible Notes outstanding, which mature on July 1, 2022. Interest on the 2022 Convertible Notes at the 4.75% cash coupon rate is payable semi-annually in arrears on each January 1 and July 1. Including amortization of deferred issuance costs, the effective interest rate is 5.4% for the six months ended June 30, 2021 and 2020. Remaining deferred issuance costs were $0.5 million and $0.7 million at June 30, 2021 and December 31, 2020, respectively. Interest expense on the 2022 Convertible Notes was as follows:

	Three months ended June 30,				Six months ended June 30,
(in millions)	2021		2020		2021		2020
Contractual coupon rate	$	1.0	$	3.2	$	2.0	$	6.6
Amortization of debt issuance costs	0.1		0.4		0.2		0.8
Total interest expense	$	1.1	$	3.6	$	2.2	$	7.4

The Company does not have the right to redeem the 2022 Convertible Notes prior to their stated maturity date. Holders of the 2022 Convertible Notes have the option to convert their notes into shares of the Company’s common stock, at any time prior to the close of business on the business day immediately preceding the stated maturity date (July 1, 2022). The initial conversion rate for the remaining $84.2 million of 2022 Convertible Notes is 69.2042 shares of ATI common stock per $1,000 (in whole dollars) principal amount of Notes (5.8 million shares), equivalent to a conversion price of $14.45 per share, subject to adjustment in certain events. Other than receiving cash in lieu of fractional shares, holders do not have the option to receive cash instead of shares of common stock upon conversion. Accrued and unpaid interest that exists upon conversion of a note will be deemed paid by the delivery of shares of ATI common stock and no cash payment or additional shares will be given to the holders.

If the Company undergoes a fundamental change as defined in the agreement, holders of the 2022 Convertible Notes may require the Company to repurchase the notes in whole or in part for cash at a price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the repurchase date.

Note 8. Derivative Financial Instruments and Hedging

As part of its risk management strategy, the Company, from time-to-time, utilizes derivative financial instruments to manage its exposure to changes in raw material prices, energy costs, foreign currencies, and interest rates. In accordance with applicable accounting standards, the Company accounts for most of these contracts as hedges.

The Company sometimes uses futures and swap contracts to manage exposure to changes in prices for forecasted purchases of raw materials, such as nickel, and natural gas. Under these contracts, which are generally accounted for as cash flow hedges, the price of the item being hedged is fixed at the time that the contract is entered into, and the Company is obligated to make or receive a payment equal to the net change between this fixed price and the market price at the date the contract matures.

The majority of ATI’s products are sold utilizing raw material surcharges and index mechanisms. However, as of June 30, 2021, the Company had entered into financial hedging arrangements, primarily at the request of its customers, related to firm orders, for an aggregate notional amount of approximately 5 million pounds of nickel with hedge dates through 2023. The aggregate notional amount hedged is approximately 10% of a single year’s estimated nickel raw material purchase requirements.

At June 30, 2021, the outstanding financial derivatives used to hedge the Company’s exposure to energy cost volatility included natural gas cost hedges. At June 30, 2021, the Company hedged approximately 70% of its forecasted domestic requirements for natural gas for the remainder of 2021 and approximately 25% for 2022.

While the majority of the Company’s direct export sales are transacted in U.S. dollars, foreign currency exchange contracts are used, from time-to-time, to limit transactional exposure to changes in currency exchange rates for those transactions denominated in a non-U.S. currency. The Company sometimes purchases foreign currency forward contracts that permit it to sell specified amounts of foreign currencies expected to be received from its export sales for pre-established U.S. dollar amounts at specified dates. The forward contracts are denominated in the same foreign currencies in which export sales are denominated. These contracts are designated as hedges of the variability in cash flows of a portion of the forecasted future export sales transactions which otherwise would expose the Company to foreign currency risk, primarily euro. In addition, the Company may also hedge forecasted capital expenditures and designate cash balances held in foreign currencies as hedges of forecasted foreign currency transactions. At June 30, 2021, the Company had no significant outstanding foreign currency forward contracts.

15

The Company may enter into derivative interest rate contracts to maintain a reasonable balance between fixed- and floating-rate debt. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed rate. The swap matures in June 2024. The Company designated the interest rate swap as a cash flow hedge of the Company’s exposure to the variability of the payment of interest on a portion of its Term Loan borrowings. The ineffectiveness at hedge inception, determined from the fair value of the swap immediately prior to its July 2019 amendment, was amortized to interest expense over the initial Term Loan swap maturity date of January 12, 2021.

There are no credit risk-related contingent features in the Company’s derivative contracts, and the contracts contained no provisions under which the Company has posted, or would be required to post, collateral. The counterparties to the Company’s derivative contracts are substantial and creditworthy commercial banks that are recognized market makers. The Company controls its credit exposure by diversifying across multiple counterparties and by monitoring credit ratings and credit default swap spreads of its counterparties. The Company also enters into master netting agreements with counterparties when possible.

The fair values of the Company’s derivative financial instruments are presented below, representing the gross amounts recognized which are not offset by counterparty or by type of item hedged. All fair values for these derivatives were measured using Level 2 information as defined by the accounting standard hierarchy, which includes quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs derived principally from or corroborated by observable market data.

(In millions) Asset derivatives	Balance sheet location	June 30, 2021		December 31, 2020
Derivatives designated as hedging instruments:
Nickel and other raw material contracts	Prepaid expenses and other current assets	$	3.8	$	3.7
Natural gas contracts	Prepaid expenses and other current assets	2.6		0.2
Nickel and other raw material contracts	Other assets	0.8		0.7
Natural gas contracts	Other assets	0.4		0.2
Total derivatives designated as hedging instruments		$	7.6	$	4.8
Liability derivatives	Balance sheet location
Derivatives designated as hedging instruments:
Interest rate swap	Other current liabilities	$	1.0	$	1.0
Natural gas contracts	Other current liabilities	—		0.3
Nickel and other raw material contracts	Other current liabilities	—		0.1
Interest rate swap	Other long-term liabilities	1.6		2.5
Natural gas contracts	Other long-term liabilities	—		0.1
Total derivatives designated as hedging instruments		$	2.6	$	4.0

For derivative financial instruments that are designated as cash flow hedges, the gain or loss on the derivative is reported as a component of other comprehensive income (OCI) and reclassified into earnings in the same period or periods during which the hedged item affects earnings. For derivative financial instruments that are designated as fair value hedges, changes in the fair value of these derivatives are recognized in current period results and are reported as changes within accrued liabilities and other on the consolidated statements of cash flows. There were no outstanding fair value hedges as of June 30, 2021. The Company did not use net investment hedges for the periods presented. The effects of derivative instruments in the tables below are presented net of related income taxes, excluding any impacts of changes to income tax valuation allowances affecting results of operations or other comprehensive income, when applicable (see Note 14 for further explanation).

Assuming market prices remain constant with those at June 30, 2021, a pre-tax gain of $5.4 million is expected to be recognized over the next 12 months.

16

Activity with regard to derivatives designated as cash flow hedges for the three and six month periods ended June 30, 2021 and 2020 was as follows (in millions): 

	Amount of Gain (Loss) Recognized in OCI on Derivatives				Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (a)
	Three months ended June 30,				Three months ended June 30,
Derivatives in Cash Flow Hedging Relationships	2021		2020		2021		2020
Nickel and other raw material contracts	$	3.4	$	2.0	$	1.1	$	(1.8)
Natural gas contracts	2.0		(0.1)		0.2		(1.0)
Foreign exchange contracts	—		—		—		(0.1)
Interest rate swap	(0.3)		(0.3)		(0.2)		(0.3)
Total	$	5.1	$	1.6	$	1.1	$	(3.2)

	Amount of Gain (Loss) Recognized in OCI on Derivatives				Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (a)
	Six months ended June 30,				Six months ended June 30,
Derivatives in Cash Flow Hedging Relationships	2021		2020		2021		2020
Nickel and other raw material contracts	$	2.8	$	(4.2)	$	2.6	$	(2.0)
Natural gas contracts	2.4		(1.3)		0.2		(2.0)
Foreign exchange contracts	0.1		(0.1)		—		(0.1)
Interest rate swap	0.1		(2.2)		(0.4)		(0.5)
Total	$	5.4	$	(7.8)	$	2.4	$	(4.6)

(a)The gains (losses) reclassified from accumulated OCI into income related to the derivatives, with the exception of the interest rate swap, are presented in cost of sales in the same period or periods in which the hedged item affects earnings. The gains (losses) reclassified from accumulated OCI into income on the interest rate swap are presented in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings.

The disclosures of gains or losses presented above for nickel and other raw material contracts and foreign currency contracts do not take into account the anticipated underlying transactions. Since these derivative contracts represent hedges, the net effect of any gain or loss on results of operations may be fully or partially offset.

Note 9. Fair Value of Financial Instruments

The estimated fair value of financial instruments at June 30, 2021 was as follows: 

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	472.5	$	472.5	$	472.5	$	—
Derivative financial instruments:
Assets	7.6		7.6		—		7.6
Liabilities	2.6		2.6		—		2.6
Debt (a)	1,635.7		1,930.0		1,669.9		260.1

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The estimated fair value of financial instruments at December 31, 2020 was as follows: 

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	645.9	$	645.9	$	645.9	$	—
Derivative financial instruments:
Assets	4.8		4.8		—		4.8
Liabilities	4.0		4.0		—		4.0
Debt (a)	1,629.1		1,847.7		1,594.2		253.5

(a)The total carrying amount for debt for both periods excludes debt issuance costs related to the recognized debt liability which is presented in the consolidated balance sheet as a direct reduction from the carrying amount of the debt liability. The December 31, 2020 debt carrying value includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes. Effective January 1, 2021, ATI early-adopted new accounting guidance that eliminated the equity component classification of the embedded conversion option of the 2025 Convertible Notes (see Note 1).

In accordance with accounting standards, fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Accounting standards established three levels of a fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

Level 1 – Quoted prices in active markets for identical assets or liabilities.

Level 2 – Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The availability of observable market data is monitored to assess the appropriate classification of financial instruments within the fair value hierarchy. Changes in economic conditions or model-based valuation techniques may require the transfer of financial instruments from one fair value level to another. In such instances, the transfer is reported at the beginning of the reporting period.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents: Fair value was determined using Level 1 information.

Derivative financial instruments: Fair values for derivatives were measured using exchange-traded prices for the hedged items. The fair value was determined using Level 2 information, including consideration of counterparty risk and the Company’s credit risk.

Short-term and long-term debt: The fair values of the Company’s publicly traded debt were based on Level 1 information. The fair values of the other short-term and long-term debt were determined using Level 2 information.

Note 10. Retirement Benefits

The Company has defined contribution retirement plans or defined benefit pension plans covering substantially all employees. Company contributions to defined contribution retirement plans are generally based on a percentage of eligible pay or based on hours worked. Benefits under the defined benefit pension plans are generally based on years of service and/or final average pay. The Company funds the U.S. pension plans in accordance with the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code of 1986, as amended (IRC). The Company also sponsors several postretirement plans covering certain collectively-bargained salaried and hourly employees. The plans provide health care and life insurance benefits for eligible retirees. In most retiree health care plans, Company contributions towards premiums are capped based on

18

the cost as of a certain date, thereby creating a defined contribution. All defined benefit pension and retiree health care plans are closed to new entrants.

For the three month periods ended June 30, 2021 and 2020, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 

	Pension Benefits				Other Postretirement Benefits
	Three months ended June 30,				Three months ended June 30,
	2021		2020		2021		2020
Service cost - benefits earned during the year	$	3.7	$	3.1	$	0.4	$	0.6
Interest cost on benefits earned in prior years	17.1		21.6		2.1		2.7
Expected return on plan assets	(34.1)		(33.6)		—		—
Amortization of prior service cost (credit)	0.1		0.2		(0.6)		(1.0)
Amortization of net actuarial loss	18.9		18.6		3.3		2.7
Total retirement benefit expense	$	5.7	$	9.9	$	5.2	$	5.0

For the six month periods ended June 30, 2021 and 2020, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions):

	Pension Benefits				Other Postretirement Benefits
	Six months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Service cost - benefits earned during the year	$	7.5	$	6.3	$	0.7	$	1.1
Interest cost on benefits earned in prior years	34.2		43.1		4.2		5.4
Expected return on plan assets	(68.2)		(67.2)		—		—
Amortization of prior service cost (credit)	0.3		0.4		(1.3)		(1.9)
Amortization of net actuarial loss	37.8		37.2		6.6		5.4
Total retirement benefit expense	$	11.6	$	19.8	$	10.2	$	10.0

Note 11. Income Taxes

The provision for income taxes for the second quarter and six months ended June 30, 2021 was $4.0 million and $9.5 million, respectively. The tax provision for the second quarter and six months ended June 30, 2020 was $92.6 million, or (28.3)%, and $103.4 million, or (35.3)%, respectively, of loss before taxes, based on the actual year to date effective rate for this period. In the second quarter 2020, the Company entered into a three-year cumulative loss within the United States, limiting the Company’s ability to utilize future projections when analyzing the need for a valuation allowance, therefore limiting sources of income as part of the analysis. As a result, ATI recorded a $99.0 million deferred tax asset valuation allowance on its U.S. federal and state tax attributes in the second quarter of 2020. ATI continues to maintain valuation allowances on its U.S. federal and state deferred tax assets, as well as for certain foreign jurisdictions. Throughout 2020, the Company calculated the provision for income taxes based upon actual year to date results due to the uncertainty of future projections as a result of the global pandemic. For 2021, the Company continues to be unable to make a reliable estimate of the annual effective tax rate, as significant changes in projected results for the Company’s U.S. operations could produce a significant variation in its annual effective tax rate. As a result, the Company recorded income tax for the six months ended June 30, 2021 based upon an annual effective tax rate for its foreign, non-valuation allowance operations, combined with actual year-to-date tax expense related to its U.S. jurisdictions. The current year tax expense is mainly attributable to the Company’s foreign operations.

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Note 12. Business Segments

The Company operates in two business segments: High Performance Materials & Components (HPMC) and Advanced Alloys & Solutions (AA&S). In the fourth quarter 2020, the Company changed its segment performance measure from segment operating profit to segment EBITDA, based on internal reporting changes. Prior period results are presented using the new performance measure. The measure of segment EBITDA excludes all effects of LIFO inventory accounting and any related changes in net realizable value inventory reserves which offset the Company’s aggregate net debit LIFO valuation balance, income taxes, depreciation and amortization, corporate expenses, net interest expense, closed operations and other income (expense), charges for goodwill and asset impairments, restructuring and other credits/charges, strike related costs, debt extinguishment charges and non-operating gains or losses. Management believes segment EBITDA, as defined, provides an appropriate measure of controllable operating results at the business segment level. Following is certain financial information with respect to the Company’s business segments for the periods indicated (in millions):

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Total sales:
High Performance Materials & Components	$	318.7	$	316.7	$	583.9	$	765.2
Advanced Alloys & Solutions	339.4		506.2		815.4		1,093.8
	658.1		822.9		1,399.3		1,859.0
Intersegment sales:
High Performance Materials & Components	18.1		16.0		42.4		44.2
Advanced Alloys & Solutions	23.8		36.6		48.2		89.0
	41.9		52.6		90.6		133.2
Sales to external customers:
High Performance Materials & Components	300.6		300.7		541.5		721.0
Advanced Alloys & Solutions	315.6		469.6		767.2		1,004.8
	$	616.2	$	770.3	$	1,308.7	$	1,725.8

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
EBITDA:
High Performance Materials & Components	$	37.2	$	28.7	$	61.8	$	105.3
Advanced Alloys & Solutions	36.0		33.4		85.7		74.5
Total segment EBITDA	73.2		62.1		147.5		179.8
LIFO and net realizable value reserves	—		—		—		—
Corporate expenses	(15.9)		(7.2)		(28.1)		(19.5)
Closed operations and other income (expense)	(3.6)		2.7		(3.1)		(3.6)
Total ATI Adjusted EBITDA	53.7		57.6		116.3		156.7
Depreciation & amortization (a)	(36.3)		(35.6)		(72.4)		(72.9)
Interest expense, net	(23.7)		(21.7)		(47.1)		(43.6)
Restructuring and other credits (charges) (See Note 6)	6.2		(16.7)		6.2		(24.7)
Strike related costs	(40.3)		—		(40.3)		—
Impairment of goodwill	—		(287.0)		—		(287.0)
Joint venture restructuring charge (See Note 5)	—		(2.4)		—		(2.4)
Debt extinguishment charge (See Note 7)	—		(21.5)		—		(21.5)
Gain on asset sales	—		—		—		2.5
Loss before income taxes	$	(40.4)	$	(327.3)	$	(37.3)	$	(292.9)

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(a) The following is depreciation & amortization by each business segment:

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
High Performance Materials & Components	$	19.2	$	19.5	$	38.8	$	39.0
Advanced Alloys & Solutions	16.1		15.3		31.6		32.3
Other	1.0		0.8		2.0		1.6
	$	36.3	$	35.6	72.4		72.9

Corporate expenses in the second quarter and first six months of 2021 reflect higher incentive compensation costs compared to the prior year periods, which also included reversals of previously-recognized expense due to COVID-19 pandemic impacts.

Closed operations and other income for the second quarter and six months of 2020 included benefits from settlements of contract indemnity obligations. Closed operations and other expense in the first six months of 2021 compared to 2020 also reflect lower costs at closed facilities, including retirement benefit expense, insurance costs, and real estate and other facility costs, and changes in foreign currency remeasurement impacts primarily related to ATI’s European Treasury operation.

During the second quarter of 2021, the Company recorded $40.3 million in strike related costs, of which $38.2 million were excluded from AA&S segment EBITDA and $2.1 million were excluded from HPMC segment EBITDA. These items primarily consisted of overhead costs recognized in the period due to below-normal operating rates, higher costs for outside conversion activities, and ongoing benefit costs for striking employees. See Note 16 for further information.

During the second quarter of 2020, the Company recorded a $287.0 million goodwill impairment charge for the partial impairment of the Forged Products reporting unit goodwill in the HPMC segment. This goodwill impairment charge was excluded from 2020 HPMC business segment EBITDA.

The $2.5 million gain on asset sales for the first six months of 2020 consists of a gain on the sale of certain oil and gas rights (see Note 6).

Note 13. Per Share Information

The following table sets forth the computation of basic and diluted loss per common share: 

(In millions, except per share amounts)	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Numerator:
Numerator for basic loss per common share –
Net loss attributable to ATI	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022	—		—		—		—
3.5% Convertible Senior Notes due 2025	—		—		—		—
Numerator for diluted loss per common share –
Net loss attributable to ATI after assumed conversions	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Denominator:
Denominator for basic net loss per common share – weighted average shares	127.1		126.6		127.0		126.4
Effect of dilutive securities:
Share-based compensation	—		—		—		—
4.75% Convertible Senior Notes due 2022	—		—		—		—
3.5% Convertible Senior Notes due 2025	—		—		—		—
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions	127.1		126.6		127.0		126.4
Basic net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)
Diluted net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)

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Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and the 2025 Convertible Notes and other option equivalents and contingently issuable shares are excluded from the computation of contingently issuable shares, and therefore, from the denominator for diluted earnings per share, if the effect of inclusion is anti-dilutive. There were 25.7 million anti-dilutive shares for the three and six months ended June 30, 2021, and 20.5 million and 20.4 million anti-dilutive shares for the three and six months ended June 30, 2020, respectively.

Note 14. Accumulated Other Comprehensive Income (Loss)

The changes in AOCI by component, net of tax, for the three month period ended June 30, 2021 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, March 31, 2021	$	(1,103.4)	$	(60.9)	$	1.1	$	(45.4)	$	(1,208.6)
OCI before reclassifications		—		5.1		5.1		—	10.2
Amounts reclassified from AOCI	(a)	16.5	(b)	—	(c)	(1.1)	(d)	6.7	22.1
Net current-period OCI		16.5		5.1		4.0		6.7	32.3
Balance, June 30, 2021	$	(1,086.9)	$	(55.8)	$	5.1	$	(38.7)	$	(1,176.3)
Attributable to noncontrolling interests:
Balance, March 31, 2021	$	—	$	21.8	$	—	$	—	$	21.8
OCI before reclassifications		—		1.9		—		—	1.9
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		1.9		—		—	1.9
Balance, June 30, 2021	$	—	$	23.7	$	—	$	—	$	23.7

The changes in AOCI by component, net of tax, for the six month period ended June 30, 2021 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, December 31, 2020	$	(1,119.9)	$	(55.5)	$	2.1	$	(50.3)	$	(1,223.6)
OCI before reclassifications		—		(0.3)		5.4		—	5.1
Amounts reclassified from AOCI	(a)	33.0	(b)	—	(c)	(2.4)	(d)	11.6	42.2
Net current-period OCI		33.0		(0.3)		3.0		11.6	47.3
Balance, June 30, 2021	$	(1,086.9)	$	(55.8)	$	5.1	$	(38.7)	$	(1,176.3)
Attributable to noncontrolling interests:
Balance, December 31, 2020	$	—	$	21.2	$	—	$	—	$	21.2
OCI before reclassifications		—		2.5		—		—	2.5
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		2.5		—		—	2.5
Balance, June 30, 2021	$	—	$	23.7	$	—	$	—	$	23.7

(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

(b)No amounts were reclassified to earnings.

(c)Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

(d)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

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The changes in AOCI by component, net of tax, for the three month period ended June 30, 2020 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, March 31, 2020	$	(1,067.4)	$	(99.2)	$	(8.5)	$	(41.5)	$	(1,216.6)
OCI before reclassifications		—		14.7		1.6		—	16.3
Amounts reclassified from AOCI	(a)	15.6	(b)	—	(c)	3.2	(d)	8.7	27.5
Net current-period OCI		15.6		14.7		4.8		8.7	43.8
Balance, June 30, 2020	$	(1,051.8)	$	(84.5)	$	(3.7)	$	(32.8)	$	(1,172.8)
Attributable to noncontrolling interests:
Balance, March 31, 2020	$	—	$	9.0	$	—	$	—	$	9.0
OCI before reclassifications		—		(0.5)		—		—	(0.5)
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		(0.5)		—		—	$	(0.5)
Balance, June 30, 2020	$	—	$	8.5	$	—	$	—	$	8.5

The changes in AOCI by component, net of tax, for the six month period ended June 30, 2020 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, December 31, 2019	$	(1,083.1)	$	(76.6)	$	(0.5)	$	(41.5)	$	(1,201.7)
OCI before reclassifications		—		(7.9)		(7.8)		—	(15.7)
Amounts reclassified from AOCI	(a)	31.3	(b)	—	(c)	4.6	(d)	8.7	44.6
Net current-period OCI		31.3		(7.9)		(3.2)		8.7	28.9
Balance, June 30, 2020	$	(1,051.8)	$	(84.5)	$	(3.7)	$	(32.8)	$	(1,172.8)
Attributable to noncontrolling interests:
Balance, December 31, 2019	$	—	$	9.8	$	—	$	—	$	9.8
OCI before reclassifications		—		(1.3)		—		—	(1.3)
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		(1.3)		—		—	$	(1.3)
Balance, June 30, 2020	$	—	$	8.5	$	—	$	—	$	8.5

(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

(b)No amounts were reclassified to earnings.

(c)Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

(d)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

Other comprehensive income (loss) amounts (OCI) reported above by category are net of applicable income tax expense (benefit) for each year presented. Income tax expense (benefit) on OCI items is recorded as a change in a deferred tax asset or liability. Amounts recognized in OCI include the impact of any deferred tax asset valuation allowances, when applicable. Foreign currency translation adjustments, including those pertaining to noncontrolling interests, are generally not adjusted for income taxes as they relate to indefinite investments in non-U.S. subsidiaries.

23

Reclassifications out of AOCI for the three and six month periods ended June 30, 2021 and 2020 were as follows: 

	Amounts reclassified to AOCI
Details about AOCI Components (In millions)	Three months ended June 30, 2021		Three months ended June 30, 2020		Six months ended June 30, 2021		Six months ended June 30, 2020			Affected line item in the statements of operations
Postretirement benefit plans
Prior service credit	$	0.5	$	0.8	$	1.0	$	1.5	(a)
Actuarial losses	(22.2)		(21.3)		(44.4)		(42.6)		(a)
	(21.7)		(20.5)		(43.4)		(41.1)		(c)	Total before tax
	(5.2)		(4.9)		(10.4)		(9.8)			Tax benefit (d)
	$	(16.5)	$	(15.6)	$	(33.0)	$	(31.3)		Net of tax
Derivatives
Nickel and other raw material contracts	$	1.4	$	(2.3)	$	3.4	$	(2.6)	(b)
Natural gas contracts	0.3		(1.3)		0.3		(2.6)		(b)
Foreign exchange contracts	—		(0.1)		—		(0.1)		(b)
Interest rate swap	(0.2)		(0.5)		(0.5)		(0.7)		(b)
	1.5		(4.2)		3.2		(6.0)		(c)	Total before tax
	0.4		(1.0)		0.8		(1.4)			Tax expense (benefit) (d)
	$	1.1	$	(3.2)	$	2.4	$	(4.6)		Net of tax

(a)Amounts are reported in nonoperating retirement benefit expense (see Note 10).

(b)Amounts related to derivatives, with the exception of the interest rate swap, are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the interest rate swap are included in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings (see Note 8).

(c)For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.

(d)These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable.

Note 15. Commitments and Contingencies

The Company is subject to various domestic and international environmental laws and regulations that govern the discharge of pollutants and disposal of wastes, and which may require that it investigate and remediate the effects of the release or disposal of materials at sites associated with past and present operations. The Company could incur substantial cleanup costs, fines, and civil or criminal sanctions, third party property damage or personal injury claims as a result of violations or liabilities under these laws or noncompliance with environmental permits required at its facilities. The Company is currently involved in the investigation and remediation of a number of its current and former sites, as well as third party sites.

Environmental liabilities are recorded when the Company’s liability is probable and the costs are reasonably estimable. In many cases, however, the Company is not able to determine whether it is liable or, if liability is probable, to reasonably estimate the loss or range of loss. Estimates of the Company’s liability remain subject to additional uncertainties, including the nature and extent of site contamination, available remediation alternatives, the extent of corrective actions that may be required, and the number, participation, and financial condition of other potentially responsible parties (PRPs). The Company adjusts its accruals to reflect new information as appropriate. Future adjustments could have a material adverse effect on the Company’s consolidated results of operations in a given period, but the Company cannot reliably predict the amounts of such future adjustments.

At June 30, 2021, the Company’s reserves for environmental remediation obligations totaled approximately $13 million, of which $4 million was included in other current liabilities. The reserve includes estimated probable future costs of $3 million for federal Superfund and comparable state-managed sites; $8 million for formerly owned or operated sites for which the Company has remediation or indemnification obligations; and $2 million for owned or controlled sites at which Company operations have been or plan to be discontinued. The timing of expenditures depends on a number of factors that vary by site. The Company expects that it will expend present accruals over many years and that remediation of all sites with which it has been identified will be completed within thirty years. The Company continues to evaluate whether it may be able to recover a portion of past and future costs for environmental liabilities from third parties and to pursue such recoveries where appropriate.

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Based on currently available information, it is reasonably possible that costs for recorded matters may exceed the Company’s recorded reserves by as much as $15 million. Future investigation or remediation activities may result in the discovery of additional hazardous materials or potentially higher levels of contamination than discovered during prior investigation, and may impact costs associated with the success or lack thereof in remedial solutions. Therefore, future developments, administrative actions or liabilities relating to environmental matters could have a material adverse effect on the Company’s consolidated financial condition or results of operations.

A number of other lawsuits, claims and proceedings have been or may be asserted against the Company relating to the conduct of its currently and formerly owned businesses, including those pertaining to product liability, environmental, health and safety matters and occupational disease (including as each relates to alleged asbestos exposure), as well as patent infringement, commercial, government contracting, construction, employment, employee and retiree benefits, taxes, environmental, and stockholder and corporate governance matters. While the outcome of litigation cannot be predicted with certainty, and some of these lawsuits, claims or proceedings may be determined adversely to the Company, management does not believe that the disposition of any such pending matters is likely to have a material adverse effect on the Company’s financial condition or liquidity, although the resolution in any reporting period of one or more of these matters could have a material adverse effect on the Company’s consolidated results of operations for that period.

Allegheny Technologies Incorporated and its subsidiary, ATI Titanium LLC (ATI Titanium), are parties to a lawsuit captioned US Magnesium, LLC v. ATI Titanium LLC (Case No. 2:17-cv-00923-DB) and filed in federal district court in Salt Lake City, UT, pertaining to a Supply and Operating Agreement between US Magnesium LLC (USM) and ATI Titanium entered into in 2006 (the Supply Agreement). In 2016, ATI Titanium notified USM that it would suspend performance under the Supply Agreement in reliance on certain terms and conditions included in the Supply Agreement. USM subsequently filed a claim challenging ATI Titanium’s right to suspend performance under the Supply Agreement, claiming that such suspension was a material breach of the Supply Agreement and seeking monetary damages, and ATI Titanium filed a counterclaim for breach of contract against USM. In 2018, USM obtained leave of the court to add Allegheny Technologies Incorporated as a separate party defendant, and ATI Titanium filed a motion to dismiss the claim against Allegheny Technologies Incorporated, which the court denied on April 19, 2019. No trial date has been set by the court given the restrictions of the pandemic. While ATI intends to vigorously defend against and pursue these claims, it cannot predict their outcomes at this time.

Note 16. Subsequent Event

The Company’s collective bargaining agreement (CBA) with the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied & Industrial Service Workers International Union, AFL-CIO, CLC (USW) involving approximately 1,100 active full-time represented employees located primarily within the AA&S segment operations, as well as a number of inactive employees, expired on February 28, 2021. USW-represented employees continued to work under the terms of the expired CBA until March 30, 2021 when they engaged in a strike. On July 14, 2021, ATI announced that a new four-year labor agreement was ratified with the USW, ending the strike. As a result of this new CBA, ATI expects to recognize an approximately $65 million pretax gain in the third quarter of 2021 related to a plan termination that eliminated certain postretirement medical benefit liabilities, comprised of $43 million of long-term postretirement benefit liabilities as of June 30, 2021 and $22 million of amounts recorded in accumulated other comprehensive income at that date. Discrete tax effects related to this event are expected to be approximately $15 million of income tax expense.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

ATI is a global manufacturer of technically advanced specialty materials and complex components. Our largest markets are aerospace & defense, representing approximately 40% of total sales, led by products for jet engines. Additionally, we have a strong presence in the energy markets, including oil & gas, downstream processing, and specialty energy. In aggregate, these markets represent about 60% of our revenue. ATI is a market leader in manufacturing differentiated products that require our materials science capabilities and unique process technologies, including our new product development competence. Our capabilities range from cast/wrought and powder alloy development to final production of highly engineered finished components, including those used in next-generation jet engines and 3D-printed aerospace products.

In the fourth quarter 2020, the Company changed its segment performance measure from segment operating profit to segment EBITDA, based on internal reporting changes. Prior period results are presented using the new performance measure. The measure of segment EBITDA is defined further below. Management believes segment EBITDA, as defined, provides an appropriate measure of controllable operating results at the business segment level.

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ATI reported second quarter 2021 sales of $616.2 million and a loss before tax of $40.4 million, compared to sales of $770.3 million and a loss before tax of $327.3 million for the second quarter of 2020. Our gross profit for the second quarter of 2021 was $42.7 million, or 6.9% of sales, a $32.0 million decrease, and a 280 basis point decrease, compared to the second quarter 2020, reflecting weakened market conditions resulting from the COVID-19 pandemic. Our second quarter 2021 sales and results also include a significant negative impact on our Specialty Rolled Products (SRP) business from the strike by employees represented by the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied & Industrial Service Workers International Union, AFL-CIO, CLC (USW).

Second quarter 2021 results include $40.3 million of strike related costs primarily consisting of overhead costs recognized in the period due to below-normal operating rates, higher costs for outside conversion activities, and ongoing benefit costs for striking employees. Second quarter 2021 results also include a $6.2 million net credit for restructuring charges, primarily related to lowered severance-related reserves based on changes in planned operating rates and revised workforce reduction estimates. Second quarter 2020 results included $327.6 million of pretax charges, which consisted of the following:

• $287.0 million for impairment of a portion of goodwill at our Forged Products operations;

• $21.5 million for debt extinguishment on $203.2 million, or 71%, of the principal balance of the outstanding 4.75% Convertible Senior Notes due 2022 (the 2022 Convertible Notes);

• $16.7 million of restructuring charges for severance for hourly and salary employees; and

• $2.4 million of severance charges at our A&T Stainless joint venture.

All of these items discussed above are excluded from segment EBITDA. The restructuring credits/charges, strike related costs and goodwill impairment charge are included in operating loss on the consolidated statements of operations, which was an operating loss of $11.3 million for the second quarter 2021, compared to an operating loss of $273.4 million for the second quarter 2020.

Nonoperating items included $6.8 million in nonoperating retirement benefit expense in the second quarter 2021, compared to $11.2 million in the prior year period. Second quarter 2021 results include $4.0 million of income tax expense, primarily for foreign operations, as ATI continues to maintain a valuation allowance on its U.S. deferred tax assets. In the second quarter 2020, we recorded a $99.0 million deferred tax asset valuation allowance on our U.S. federal and state tax attributes, due to the inability to consider future results for the realizability of these tax attributes resulting from a three-year cumulative loss position. Net loss attributable to ATI was $49.2 million, or ($0.39) per share, in the second quarter of 2021, compared to a net loss attributable to ATI of $422.6 million, or ($3.34) per share, for the second quarter of 2020. Adjusted EBITDA was $53.7 million, or 8.7% of sales, for the second quarter 2021, and $57.6 million, or 7.5% of sales, for the prior year second quarter. See the Financial Condition and Liquidity section of Management’s Discussion and Analysis for these non-GAAP definitions and calculations.

Our second quarter 2021 results reflect the ongoing improvements in many of our key end markets, most notably jet engine materials and components. However, weakened market conditions resulting from the COVID-19 pandemic still continued to impact end market demand in the second quarter 2021. We continued our solid balance sheet and cash and liquidity positions during the second quarter of 2021 to support our ability to meet customer obligations and succeed in this economic environment. To help further mitigate the financial impact from these market conditions, including reduced aerospace and consumer demand stemming from the COVID-19 pandemic, ATI proactively implemented workforce reduction initiatives in 2020. These actions helped to better align our cost structure to expected demand. Additionally, we continued our strategic transformation efforts within the AA&S segment to eliminate production of standard stainless sheet products in the SRP business in 2021. In the second quarter of 2021, we entered into a long-term agreement for carbon steel conversion services that is expected to significantly improve utilization at our Hot-Rolling and Processing Facility (HRPF). These actions provide a strong foundation in response to the economic challenges created by the COVID-19 pandemic.

ATI’s collective bargaining agreement (CBA) with the USW involving approximately 1,100 active full-time represented employees located primarily within the AA&S segment operations, as well as a number of inactive employees, expired on February 28, 2021. USW-represented employees continued to work under the terms of the expired CBA until March 30, 2021 when they engaged in a strike. This labor action did have a significant impact on the second quarter 2021 results, despite ATI working to minimize the operational disruption and financial impact from the strike as the negotiation process to reach a new labor agreement progressed. On July 14, 2021, we announced that a new four-year labor agreement with the USW was ratified, ending the strike. As part of an orderly return to work process, employees began returning to active employment during the week of July 19, 2021. We expect the SRP business to continue to be negatively impacted in the third quarter of 2021 by lingering effects from the USW strike as workers return and production ramps back toward pre-strike levels. The new CBA, which covers the term from March 1, 2021 to February 28, 2025, delivers a competitive wage and benefit package to these

26

represented employees, while securing ATI’s ability to reduce its exposure to health care cost inflation, which is critical for the long-term viability of ATI’s SRP business. As a result of this new CBA, ATI expects to recognize an approximately $65 million pretax gain in the third quarter of 2021 related to a reduction in our postretirement medical plan liabilities.

Compared to the second quarter 2020, sales were flat in the HPMC business segment and decreased 33% in the AA&S business segment. In HPMC, second quarter 2021 sales to the commercial aerospace market decreased 23%. This decline was partially offset by an increase in defense and energy market sales. Compared to the prior year period, lower AA&S sales across most major end markets were primarily due to the strike and the ongoing exit from the standard stainless sheet market. Energy market sales declined by 52% and commercial aerospace market sales declined 61% compared to the prior-year period.

Results for the first six months of 2021 were sales of $1.31 billion and loss before tax of $37.3 million, compared to sales of $1.73 billion and loss before tax of $292.9 million for the first six months of 2020. Our gross profit was $128.5 million, or 9.8% of sales, an $81.0 million decline compared to the first six months of 2020, reflecting COVID-19 and strike related impacts. The 2021 results include the $40.3 million of strike related costs and the $6.2 million net credit for restructuring recorded in the second quarter 2021 discussed above which are excluded from segment results. The 2020 results include the $327.6 million of charges recorded in the second quarter 2020 discussed above as well as an $8.0 million restructuring charge recorded in the first quarter of 2020, which is excluded from segment results, for severance obligations for a voluntary retirement incentive program for eligible salaried employees.

Nonoperating items included a reduction in nonoperating retirement benefit expense of approximately $9 million for the first half 2021, compared to the prior year period. Results for the six months 2020 include the $99.0 million deferred tax asset valuation allowance on our U.S. federal and state tax attributes recorded in the second quarter 2020. Net loss attributable to ATI was $57.1 million, or ($0.45) per share, in the first six months of 2021, compared to a net loss attributable to ATI of $401.5 million, or ($3.18) per share, for the first six months of 2020.

Compared to the first six months of 2020, sales decreased 25% in the HPMC business segment and 24% in the AA&S business segment. Sales to the aerospace & defense markets in the HPMC segment were 35% lower than the first six months of 2020, due to declines in the commercial aerospace market. AA&S sales reflect lower sales across all major markets with the exception of the automotive and electronics markets.

In aggregate, ATI’s aerospace & defense markets sales decreased 23% to $281.2 million in the second quarter 2021, compared to the second quarter 2020. HPMC sales of next-generation jet engine products, which represented 36% of total second quarter 2021 HPMC jet engine product sales, decreased 22% compared to the second quarter 2020.

Comparative information for our overall revenues (in millions) by end market and their respective percentages of total revenues for the three and six month periods ended June 30, 2021 and 2020 were as follows:

	Three months ended				Three months ended
Markets	June 30, 2021				June 30, 2020
Aerospace & Defense:
Jet Engines- Commercial	$	129.6	21	%	$	157.8	20	%
Airframes- Commercial	54.4		9	%	117.5		15	%
Defense	97.2		16	%	90.3		12	%
Total Aerospace & Defense	$	281.2	46	%	$	365.6	47	%
Energy:
Oil & Gas	56.1		9	%	109.1		14	%
Specialty Energy	62.2		10	%	58.4		8	%
Total Energy	118.3		19	%	167.5		22	%
Automotive	68.0		11	%	50.8		7	%
Electronics	43.3		7	%	39.5		5	%
Medical	32.0		5	%	29.9		4	%
Construction/Mining	21.9		4	%	34.8		4	%
Food Equipment & Appliances	20.7		3	%	47.2		6	%
Other	30.8		5	%	35.0		5	%
Total	$	616.2	100	%	$	770.3	100	%

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	Six months ended				Six months ended
Markets	June 30, 2021				June 30, 2020
Aerospace & Defense:
Jet Engines- Commercial	$	235.7	18	%	$	430.0	25	%
Airframes- Commercial	112.6		9	%	252.4		15	%
Defense	187.1		14	%	175.7		10	%
Total Aerospace & Defense	$	535.4	41	%	$	858.1	50	%
Energy:
Oil & Gas	138.6		10	%	227.2		13	%
Specialty Energy	128.8		10	%	110.9		7	%
Total Energy	267.4		20	%	338.1		20	%
Automotive	159.5		12	%	127.3		7	%
Electronics	98.9		8	%	72.7		4	%
Construction/Mining	64.4		5	%	78.4		4	%
Medical	61.0		5	%	68.5		4	%
Food Equipment & Appliances	56.1		4	%	97.6		6	%
Other	66.0		5	%	85.1		5	%
Total	$	1,308.7	100	%	$	1,725.8	100	%

For the second quarter 2021, international sales of $287 million, or 47% of total sales, decreased from $293 million, or 38% of total sales, in the second quarter 2020. ATI’s international sales are mostly to the aerospace, energy, electronics, automotive and medical markets.

Sales of our high-value products represented 95% and 91% of total sales for the three and six months ended June 30, 2021, respectively, reflecting the ongoing exit from standard stainless sheet products. Comparative information for our major high-value and standard products based on their percentages of revenues are shown below. In conjunction with the announced ongoing exit of standard stainless sheet products, in the fourth quarter of 2020 ATI reclassified certain items in the AA&S segment as High-Value Products. Prior period information reflects these reclassifications. HRPF conversion service sales in the AA&S segment are excluded from this presentation. We expect to cease production of standard stainless sheet products by the end of fiscal year 2021.

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
High-Value Products
Nickel-based alloys and specialty alloys	33	%	34	%	32	%	34	%
Precision rolled strip products	19	%	12	%	20	%	12	%
Precision forgings, castings and components	18	%	14	%	17	%	15	%
Titanium and titanium-based alloys	13	%	19	%	12	%	18	%
Zirconium and related alloys	12	%	8	%	10	%	8	%
Total High-Value Products	95	%	87	%	91	%	87	%
Standard Products
Standard stainless products	5	%	13	%	9	%	13	%
Grand Total	100	%	100	%	100	%	100	%

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Segment EBITDA for the second quarter 2021 was $73.2 million, or 11.9% of sales, compared to segment EBITDA of $62.1 million, or 8.1% of sales, for the second quarter of 2020. Segment EBITDA for the first six months of 2021 was $147.5 million, or 11.3% of sales, compared to segment EBITDA of $179.8 million, or 10.4% of sales, for the first six months of 2020. Our measure of segment EBITDA, which we use to analyze the performance and results of our business segments, excludes all effects of LIFO inventory accounting and any related changes in net realizable value (NRV) inventory reserves which offset the Company’s aggregate net debit LIFO valuation balance, income taxes, depreciation and amortization, corporate expenses, net interest expense, closed operations and other income (expense), charges for goodwill and asset impairments, restructuring and other credits/charges, strike related costs, debt extinguishment charges and non-operating gains or losses. Results on our management basis of reporting were as follows (in millions):

	Three months ended June 30,						Six months ended June 30,
	2021			2020			2021			2020
Sales:
High Performance Materials & Components	$	300.6		$	300.7		$	541.5		$	721.0
Advanced Alloys & Solutions	315.6			469.6			767.2			1,004.8
Total external sales	$	616.2		$	770.3		$	1,308.7		$	1,725.8
EBITDA:
High Performance Materials & Components	$	37.2		$	28.7		$	61.8		$	105.3
% of Sales	12.4		%	9.5		%	11.4		%	14.6		%
Advanced Alloys & Solutions	36.0			33.4			85.7			74.5
% of Sales	11.4		%	7.1		%	11.2		%	7.4		%
Total segment EBITDA	$	73.2		$	62.1		$	147.5		$	179.8
% of Sales	11.9		%	8.1		%	11.3		%	10.4		%
LIFO and net realizable value reserves	—			—			—			—
Corporate expenses	(15.9)			(7.2)			(28.1)			(19.5)
Closed operations and other income (expense)	(3.6)			2.7			(3.1)			(3.6)
Total ATI Adjusted EBITDA	53.7			57.6			116.3			156.7
Depreciation & amortization	(36.3)			(35.6)			(72.4)			(72.9)
Interest expense, net	(23.7)			(21.7)			(47.1)			(43.6)
Restructuring and other credits (charges)	6.2			(16.7)			6.2			(24.7)
Strike related costs	(40.3)			—			(40.3)			—
Impairment of goodwill	—			(287.0)			—			(287.0)
Joint venture restructuring charges	—			(2.4)			—			(2.4)
Debt extinguishment charge	—			(21.5)			—			(21.5)
Gain on asset sales	—			—			—			2.5
Loss before income taxes	$	(40.4)		$	(327.3)		$	(37.3)		$	(292.9)

Business Segment Results

High Performance Materials & Components Segment

Second quarter 2021 sales of $300.6 million were flat with the second quarter 2020. Sales to the commercial aerospace market decreased 23% resulting from the global COVID-19 pandemic. This decrease was partially offset by a 28% increase in defense market sales and an increase in energy market sales, which more than doubled compared to the prior year quarter, on stronger demand for specialty energy materials for land-based gas turbines, particularly in Asia. Sales of next-generation jet engine products represented 36% of total second quarter 2021 HPMC jet engine product sales.

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Comparative information for our HPMC segment revenues (in millions) by market and their respective percentages of the segment’s overall revenues for the three month periods ended June 30, 2021 and 2020 is as follows: 

	Three months ended				Three months ended
Markets	June 30, 2021				June 30, 2020
Aerospace & Defense:
Jet Engines- Commercial	$	122.0	41	%	$	141.4	47	%
Airframes- Commercial	34.1		11	%	62.0		21	%
Defense	62.5		21	%	48.9		16	%
Total Aerospace & Defense	218.6		73	%	252.3		84	%
Energy:
Oil & Gas	10.3		3	%	10.4		4	%
Specialty Energy	38.3		13	%	12.4		4	%
Total Energy	48.6		16	%	22.8		8	%
Medical	14.6		5	%	10.3		3	%
Construction/Mining	6.1		2	%	5.0		2	%
Other	12.7		4	%	10.3		3	%
Total	$	300.6	100	%	$	300.7	100	%

International sales represented 48% of total segment sales for the second quarter 2021. Comparative information for the HPMC segment’s major product categories, based on their percentages of revenue for the three months ended June 30, 2021 and 2020, is as follows: 

	Three months ended June 30,
	2021		2020
High-Value Products
Nickel-based alloys and specialty alloys	45	%	36	%
Precision forgings, castings and components	36	%	35	%
Titanium and titanium-based alloys	19	%	29	%
Total High-Value Products	100	%	100	%

Segment EBITDA in the second quarter 2021 increased to $37.2 million, or 12.4% of total sales, compared to $28.7 million, or 9.5% of total sales, for the second quarter 2020. Strike related costs of $2.1 million were excluded from HPMC segment second quarter 2021 results. This increase was due to improved operating margins from higher production volumes, aided by share gains and the ongoing benefits of 2020 cost cutting actions, and benefits from raw material price changes, which more than offset a 22% decline in sales of higher margin next generation jet engine products versus the prior year.

HPMC second quarter results reflect a modest recovery with ongoing improvements in many of our key end markets, most notably jet engine materials and components, as well as the continued benefits from our aggressive 2020 cost cutting actions and recent share gains. Worldwide economic recovery is increasing the demand for travel and efficient energy, which benefits ATI, and we are well positioned to capture this growth in the future. We anticipate demand for materials to continue increasing for narrow body engines but lag for widebody engines. This uneven pull, coupled with any remaining channel inventory, is expected to make the growth trajectory volatile quarter-to-quarter for the balance of the year. The commercial airframe market is expected to remain weak in the second half of 2021, largely due to the sluggish demand for widebody aircraft driven by subdued international travel rates and surplus inventory within the supply chain.

Sales for the first six months of 2021 were $541.5 million, decreasing 25% compared to the first six months of 2020. Sales to the aerospace and defense markets were 35% lower, reflecting a 47% decline in the commercial aerospace market resulting from the global COVID-19 pandemic, partially offset by a 40% increase in defense market sales. Energy markets sales were almost 70% higher compared to the prior year period, driven by demand for materials for land-based gas turbines.

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Comparative information for our HPMC segment revenues (in millions) by market and their respective percentages of the segment’s overall revenues for the six month periods ended June 30, 2021 and 2020 is as follows: 

	Six months ended				Six months ended
Markets	June 30, 2021				June 30, 2020
Aerospace & Defense:
Jet Engines- Commercial	$	217.9	40	%	$	388.5	53	%
Airframes- Commercial	60.6		11	%	136.8		19	%
Defense	119.9		22	%	85.8		12	%
Total Aerospace & Defense	398.4		73	%	611.1		84	%
Energy:
Oil & Gas	18.6		4	%	23.0		3	%
Specialty Energy	60.5		11	%	23.9		4	%
Total Energy	79.1		15	%	46.9		7	%
Medical	25.8		5	%	27.3		4	%
Construction/Mining	11.2		2	%	10.3		1	%
Other	27.0		5	%	25.4		4	%
Total	$	541.5	100	%	$	721.0	100	%

International sales represented 47% of total segment sales for the first six months 2021. Comparative information for the HPMC segment’s major product categories, based on their percentages of revenue for the six months ended June 30, 2021 and 2020, is as follows: 

	Six months ended June 30,
	2021		2020
High-Value Products
Nickel-based alloys and specialty alloys	41	%	38	%
Precision forgings, castings and components	39	%	35	%
Titanium and titanium-based alloys	20	%	27	%
Total High-Value Products	100	%	100	%

Segment EBITDA in the first six months of 2021 decreased to $61.8 million, or 11.4% of total sales, compared to $105.3 million, or 14.6% of total sales, for the first six months of 2020. Despite the sequential margin improvement in the second quarter of 2021 and benefits from raw material price changes, lower overall demand, including lower sales of higher-margin next-generation jet engine products, and reduced asset utilization rates negatively impacted operating margins for the first half of 2021 compared to the prior year-to-date period, which included pre-pandemic demand levels for a portion of 2020.

Advanced Alloys & Solutions Segment

Second quarter 2021 sales were $315.6 million, decreasing 33% compared to the second quarter 2020. Declines were noted in many of our end markets, including a 52% decline in energy market sales and a 61% decline in commercial aerospace. Results were also negatively impacted by the strike, as well as the ongoing exit from the standard stainless sheet market. Sales for electronic applications were 9% higher year-over-year, driven by demand in Asia, primarily in China, and sales of automotive markets products also increased by 34%. Sales of high-value products were 25% lower, largely due to a 72% decline in titanium and titanium-based alloys, driven by lower commercial aerospace demand, and a 55% decline in nickel-based alloys and specialty alloys, partially offset by a 30% increase in sales of precision-rolled strip products, primarily from ATI’s STAL joint venture in China.

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Comparative information for our AA&S segment revenues (in millions) by market and their respective percentages of the segment’s overall revenues for the three month periods ended June 30, 2021 and 2020 is as follows:

	Three months ended				Three months ended
Markets	June 30, 2021				June 30, 2020
Energy:
Oil & Gas	$	45.8	14	%	$	98.7	21	%
Specialty Energy	23.9		8	%	46.0		10	%
Total Energy	69.7		22	%	144.7		31	%
Automotive	66.6		21	%	49.8		11	%
Aerospace & Defense:
Jet Engines- Commercial	7.6		2	%	16.5		4	%
Airframes- Commercial	20.3		6	%	55.2		12	%
Defense	34.8		11	%	41.6		8	%
Total Aerospace & Defense	62.7		19	%	113.3		24	%
Electronics	43.1		14	%	39.3		8	%
Food Equipment & Appliances	20.7		7	%	47.1		10	%
Construction/Mining	15.8		5	%	29.8		6	%
Other	37.0		12	%	45.6		10	%
Total	$	315.6	100	%	$	469.6	100	%

International sales represented 46% of total segment sales for the second quarter 2021, compared to 34% in the prior year’s second quarter. Comparative information for the AA&S segment’s major product categories, based on their percentages of revenue for the three months ended June 30, 2021 and 2020, are presented in the following table. In conjunction with the ongoing exit from standard stainless sheet products, in the fourth quarter of 2020 ATI reclassified certain items as High-Value Products. Prior period information reflects these reclassifications. HRPF conversion service sales are excluded from this presentation. We expect to cease production of standard stainless sheet products by the end of fiscal year 2021.

	Three months ended June 30,
	2021		2020
High-Value Products
Precision rolled strip products	39	%	20	%
Zirconium and related alloys	24	%	14	%
Nickel-based alloys and specialty alloys	21	%	32	%
Titanium and titanium-based alloys	6	%	13	%
Total High-Value Products	90	%	79	%
Standard Products
Standard stainless products	10	%	21	%
Total	100	%	100	%

Segment EBITDA was $36.0 million, or 11.4% of sales, for the second quarter 2021, compared to segment EBITDA of $33.4 million, or 7.1% of sales, for the second quarter 2020. Strike related costs of $38.2 million for the second quarter of 2021, primarily related to lower productivity and utilization levels, were excluded from AA&S segment results. Improved EBITDA margins reflect a richer product mix away from standard stainless products, benefits from 2020 cost reductions and $15 million in benefits from rising raw material prices, particularly nickel, at our SRP business. Second quarter 2021 results also include lower retirement benefit expense of approximately $3 million.

ATI’s second quarter results include a significant negative impact on our SRP business from the strike by employees represented by the USW. Strike related impacts, consisting of overhead costs recognized in the period due to below-normal operating rates, higher costs for outside conversion activities, and ongoing benefit costs for striking employees, have been excluded from AA&S segment results. However, AA&S segment EBITDA for the second quarter 2021 was also impacted by lower sales resulting from the strike. We expect the SRP business to be negatively impacted by lingering effects from the USW strike in the third quarter of 2021 as workers return in late July and production ramps back toward pre-strike levels. We remain on track with the transformation of the SRP business and the elimination of standard stainless sheet products by the end of 2021.

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Sales for the first six months of 2021 were $767.2 million, decreasing 24% compared to the fix six months of 2020. Declines were noted in almost all end markets, including a 35% decline in energy market sales, a 45% decline in aerospace & defense and a 43% decline in food equipment & appliances, due primarily to impacts from the strike, as well as the ongoing exit from the standard stainless sheet market. Sales of high-value products were 17% lower, largely due to a 60% decline in titanium and titanium-based alloys and a 39% decline in nickel-based alloys and specialty alloys, partially offset by a 28% increase in sales of precision-rolled strip products, primarily from ATI’s STAL joint venture in China.

Comparative information for our AA&S segment revenues (in millions) by market and their respective percentages of the segment’s overall revenues for the six month periods ended June 30, 2021 and 2020 is as follows:

	Six months ended				Six months ended
Markets	June 30, 2021				June 30, 2020
Energy:
Oil & Gas	$	120.0	16	%	$	204.2	20	%
Specialty Energy	68.3		9	%	87.0		9	%
Total Energy	188.3		25	%	291.2		29	%
Automotive	156.1		20	%	124.3		12	%
Aerospace & Defense:
Jet Engines- Commercial	17.8		2	%	41.6		4	%
Airframes- Commercial	52.0		7	%	115.5		11	%
Defense	67.3		9	%	89.9		10	%
Total Aerospace & Defense	137.1		18	%	247.0		25	%
Electronics	98.4		13	%	72.2		7	%
Food Equipment & Appliances	56.1		7	%	97.5		10	%
Construction/Mining	53.2		7	%	68.1		7	%
Other	78.0		10	%	104.5		10	%
Total	$	767.2	100	%	$	1,004.8	100	%

International sales represented 42% of total segment sales for the first six months of 2021. Comparative information for the AA&S segment’s major product categories, based on their percentages of revenue for the six months ended June 30, 2021 and 2020, are presented in the following table. In conjunction with the ongoing exit from standard stainless sheet products, ATI reclassified certain items as High-Value Products. Prior period information reflects these reclassifications. HRPF conversion service sales are excluded from this presentation. We expect to cease production of standard stainless sheet products by the end of fiscal year 2021.

	Six months ended June 30,
	2021		2020
High-Value Products
Precision rolled strip products	35	%	18	%
Nickel-based alloys and specialty alloys	25	%	28	%
Zirconium and related alloys	19	%	12	%
Titanium and titanium-based alloys	6	%	10	%
Total High-Value Products	85	%	68	%
Standard Products
Standard stainless products	15	%	32	%
Total	100	%	100	%

Segment EBITDA was $85.7 million, or 11.2% of sales, for the first six month of 2021, compared to segment EBITDA of $74.5 million, or 7.4% of sales, for the first six months of 2020. Strike related costs, primarily related to lower productivity and utilization levels, were excluded from AA&S segment results. Improved EBITDA margins reflect a richer product mix away from standard stainless products, benefits from 2020 cost reductions, which more than offset prior year-to-date results which included pre-pandemic demand levels for a portion of 2020. Current year results also include $31 million in benefits from rising raw material prices, particularly nickel, at our SRP business and lower retirement benefit expense of approximately $6 million, compared to 2020.

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Corporate Items

There was no net effect on our results of operations for changes in LIFO and NRV inventory reserves for the second quarters and first six months of 2021 and 2020. For the second quarter and first six months of 2021, LIFO inventory valuation reserve charges of $7.3 million and $14.1 million, respectively, were offset by declines of the same magnitude in NRV inventory reserves, which are required to offset the Company’s aggregate net debit LIFO inventory balance that exceeds current inventory replacement cost. For the second quarter and first six months of 2020, LIFO inventory valuation reserve benefits of $2.0 million and $14.0 million, respectively, were offset by increases of the same magnitude in the NRV inventory reserves. The NRV inventory reserve balance was $29.9 million at June 30, 2021.

Corporate expenses for the second quarter of 2021 were $15.9 million, compared to $7.2 million for the second quarter 2020. For the six months ended June 30, 2021, corporate expenses were $28.1 million, compared to $19.5 million for the six months ended June 30, 2020. The current year second quarter and six month increases include a $6.3 million and $9.2 million impact, respectively, of higher incentive compensation costs compared to the prior year periods, which included reversals of previously-recognized expense due to COVID-19 pandemic impacts.

Closed operations and other expense for the second quarter 2021 was $3.6 million, compared to income of $2.7 million for the second quarter 2020, which included benefits from settlements of contract indemnity obligations. For the six months ended June 30, 2021, closed operations and other expenses were $3.1 million, compared to expense of $3.6 million for the six months ended June 30, 2020. Closed operations and other expense in the first six months of 2021 compared to 2020 also reflects lower costs at closed facilities, including retirement benefit expense, insurance costs, and real estate and other facility costs, and changes in foreign currency remeasurement impacts primarily related to ATI’s European Treasury operation.

The following is depreciation & amortization by each business segment:

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
High Performance Materials & Components	$	19.2	$	19.5	$	38.8	$	39.0
Advanced Alloys & Solutions	16.1		15.3		31.6		32.3
Other	1.0		0.8		2.0		1.6
	$	36.3	$	35.6	72.4		72.9

Interest expense, net of interest income, in the second quarter 2021 was $23.7 million, compared to net interest expense of $21.7 million for the second quarter 2020. On a year-to-date basis, net interest expense was $47.1 million for the first six months of 2021 compared to $43.6 million for the first six months of 2020. Capitalized interest reduced interest expense by $1.2 million in the second quarter 2021 and $2.4 million in the second quarter 2020. For the six months ended June 30, 2021 and 2020, capitalized interest was $2.5 million and $4.5 million, respectively.

Restructuring charges for the second quarter and first six months of 2021 were a net credit of $6.2 million, primarily related to $6.9 million of lowered severance-related reserves for approximately 200 employees based on changes in planned operating rates and revised workforce reduction estimates. This was offset by $0.7 million of other costs related to facility idlings. A $16.7 million restructuring charge for voluntary and involuntary severance programs was recorded in the second quarter 2020. For the six months of 2020, an additional $8.0 million restructuring charge was recorded in the first quarter of 2020 for a voluntary retirement incentive program for eligible salaried employees. These charges were comprised of severance obligations for the elimination of approximately 550 positions for both involuntary reductions and voluntary retirement incentive programs related to both salary and hourly employees in the HPMC segment, in the second quarter of 2020, as well as the reduction of approximately 90 positions for a voluntary retirement incentive program for eligible salaried employees in the first quarter of 2020. These charges were excluded from segment EBITDA. Cash payments associated with cost reduction programs implemented in the fourth quarter 2019 and throughout the 2020 fiscal year were $10.2 million in the first six months of 2021. The majority of the $26.3 million of remaining reserves associated with these cost reduction programs as of June 30, 2021 are expected to be paid by the end of 2021.

Strike related costs were $40.3 million in the second quarter 2021, of which $38.2 million were excluded from AA&S segment EBITDA and $2.1 million were excluded from HPMC segment EBITDA. These items primarily consisted of overhead costs recognized in the period due to below-normal operating rates, higher costs for outside conversion activities, and ongoing benefit costs for striking employees.

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In the second quarter 2020, due to demand disruptions to the global commercial aerospace market resulting from the COVID-19 pandemic and changes in near-term demand requirements of aero-engine and airframe markets, ATI conducted an interim test for goodwill impairment at our Forged Products operations, and recognized a $287.0 million charge for the partial impairment of goodwill. This goodwill impairment charge is excluded from HPMC segment EBITDA.

In the second quarter of 2020, the A&T Stainless joint venture recorded a $4.8 million charge for contractual termination benefits, and ATI recognized a $2.4 million charge in the second quarter 2020 for its equity method share of these termination benefits. These charges are excluded from segment EBITDA.

In June 2020, ATI issued $285.0 million aggregate principal amount of 3.5% Convertible Senior Notes due 2025 (the 2025 Convertible Notes), and used the majority of the proceeds to repurchase approximately $203.2 million aggregate principal amount of the outstanding principal balance of our 2022 Convertible Notes. A $21.5 million debt extinguishment charge was recognized for this action.

During the first six months of 2020, we recognized a $2.5 million cash gain for the sale of certain oil and gas rights. This non-core asset sale gain is reported in other income/expense, net, on the consolidated statement of income and is excluded from segment EBITDA.

Income Taxes

The provision for income taxes for the second quarter and six months ended June 30, 2021 was $4.0 million and $9.5 million, respectively. The tax provision for the second quarter and six months ended June 30, 2020 was $92.6 million, or (28.3)%, and $103.4 million, or (35.3)%, respectively, of loss before taxes, based on the actual year to date effective rate for this period. In the second quarter 2020, we entered into a three-year cumulative loss within the United States, limiting our ability to utilize future projections when analyzing the need for a valuation allowance, therefore limiting sources of income as part of the analysis. As a result, we recorded a $99.0 million deferred tax asset valuation allowance on our U.S. federal and state tax attributes in the second quarter of 2020. We continue to maintain valuation allowances on our U.S. federal and state deferred tax assets, as well as for certain foreign jurisdictions. Throughout 2020, we calculated the provision for income taxes based upon actual year to date results due to the uncertainty of future projections as a result of the global pandemic. For 2021, we continue to be unable to make a reliable estimate of the annual effective tax rate, as significant changes in projected results for our U.S. operations could produce a significant variation in our annual effective tax rate. As a result, we recorded income tax for the six months ended June 30, 2021 based upon an annual effective tax rate for our foreign, non-valuation allowance operations, combined with actual year-to-date tax expense related to our U.S. jurisdictions. The current year tax expense is mainly attributable to our foreign operations.

Financial Condition and Liquidity

We have an Asset Based Lending (ABL) Credit Facility, which is collateralized by the accounts receivable and inventory of our domestic operations. The ABL facility, which matures in September 2024, includes a $500 million revolving credit facility, a letter of credit sub-facility of up to $200 million, and a $200 million term loan (Term Loan). The Term Loan has an interest rate of 2.0% plus a LIBOR spread and can be prepaid in increments of $25 million if certain minimum liquidity conditions are satisfied. In addition, we have the right to request an increase of up to $200 million in the maximum amount available under the revolving credit facility for the duration of the ABL. We have a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed interest rate. The swap matures in June 2024.

The applicable interest rate for revolving credit borrowings under the ABL facility includes interest rate spreads based on available borrowing capacity that range between 1.25% and 1.75% for LIBOR-based borrowings and between 0.25% and 0.75% for base rate borrowings. The ABL facility contains a financial covenant whereby we must maintain a fixed charge coverage ratio of not less than 1.00:1.00 after an event of default has occurred and is continuing or if the undrawn availability under the ABL revolving credit portion of the facility is less than the greater of (i) $87.5 million, calculated as 12.5% of the then applicable maximum advance amount under the revolving credit portion of the ABL and the outstanding Term Loan balance, or (ii) $62.5 million. We did not meet this fixed charge coverage ratio at June 30, 2021. As a result, we are unable to access 12.5%, or $87.5 million, of the ABL facility until we meet the ratio. Additionally, we must demonstrate minimum liquidity, as calculated in accordance with the terms of the ABL facility, during the 90-day period immediately preceding the stated maturity date of the 2022 Convertible Notes and the 5.875% Notes due 2023. The ABL also contains customary affirmative and negative covenants for credit facilities of this type, including limitations on our ability to incur additional indebtedness or liens or to enter into investments, mergers and acquisitions, dispositions of assets and transactions with affiliates, some of which are more restrictive, at any time during the term of the ABL when our fixed charge coverage ratio is less than 1.00:1.00 and our undrawn availability under the revolving portion of the ABL is less than the greater of (a) $150

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million or (b) 30% of the sum of the maximum advance amount under the revolving credit portion of the ABL and the outstanding Term Loan balance.

As of June 30, 2021, there were no outstanding borrowings under the revolving portion of the ABL facility, and $42.8 million was utilized to support the issuance of letters of credit. There were no average revolving credit borrowings under the ABL facility for the first six months of 2021. There were average revolving credit borrowings of $58 million bearing an average annual interest rate of 2.2% under the ABL facility for the first six months of 2020.

In June 2020, we issued and sold $285.0 million aggregate principal amount of 2025 Convertible Notes. We used a portion of the net proceeds from the offering of the 2025 Convertible Notes to repurchase $203.2 million aggregate principal amount of our outstanding 2022 Convertible Notes. We also used $19.0 million of the net proceeds of the offering of the 2025 Convertible Notes to pay the cost of capped call transactions, which effectively increase the initial conversion price of the 2025 Convertible Notes into ATI stock from $15.49 per share to $19.76 per share. The remainder of the net proceeds from the offering is being used for general corporate purposes.

At June 30, 2021, we had $473 million of cash and cash equivalents, and available additional liquidity under the ABL facility of approximately $350 million, for total liquidity of more than $800 million. We do not expect to pay any significant U.S. federal or state income taxes in the next several years due to net operating loss carryforwards.

We contributed $17.5 million to our U.S. qualified defined benefit pension plans in the first quarter of 2021. As a result of the American Rescue Plan Act (ARPA) enacted in March 2021, the rules governing pension funding calculations have changed. As presently adopted by ATI, pending additional IRS guidance, we are not required to make any additional contributions to these pension plans during fiscal year 2021, and our prior contributions have generated a credit balance that may be utilized to offset future minimum required contributions. Prior to the ARPA changes, our fiscal year 2021 funding requirements were approximately $87 million. Using our long-term weighted average expected rate of return on pension plan assets of 6.78%, we now expect to have average annual minimum funding requirements of approximately $10 million to these pension plans for the next few years after 2021, a significant decrease from the prior $50 million average annual estimate over that period. However, these estimates are subject to significant uncertainty, including the performance of our pension trust assets and the discount rates used to measure pension liabilities. We may elect to contribute additional amounts to these pension plans to improve their funded position, or we may elect to use a portion of our credit balance in lieu of cash contributions based on other capital allocation priorities.

We believe that internally generated funds, current cash on hand and available borrowings under the ABL facility will be adequate to meet our liquidity needs, including currently projected required contributions to our pension plans. If we needed to obtain additional financing using the credit markets, the cost and the terms and conditions of such borrowings may be influenced by our credit rating. In addition, we regularly review our capital structure, various financing alternatives and conditions in the debt and equity markets in order to opportunistically enhance our capital structure. In connection therewith, we may seek to refinance or retire existing indebtedness, incur new or additional indebtedness or issue equity or equity-linked securities, in each case, depending on market and other conditions.

We have no off-balance sheet arrangements as defined in Item 303(a)(4) of SEC Regulation S-K.

Cash Flow and Working Capital

For the six months ended June 30, 2021, cash used in operations was $102.6 million, primarily due to an $115.0 million increase in managed working capital related to increased business activity. Other significant 2021 operating cash flow items included $17.5 million in contributions to a U.S. defined benefit pension plan and payment of 2020 annual incentive compensation, partially offset by receipt of advance payments as part of long-term supply agreements in 2021. For the six months ended June 30, 2020, cash used in operations was $14.4 million, reflecting a use of cash from changes in managed working capital. Other significant 2020 items included $27.9 million in contributions to a U.S. defined benefit pension plan and payment of 2019 annual incentive compensation.

As part of managing the liquidity of our business, we focus on controlling managed working capital, which is defined as gross accounts receivable, short-term contract assets and gross inventories, less accounts payable and short-term contract liabilities. In measuring performance in controlling managed working capital, we exclude the effects of LIFO and other inventory valuation reserves, and reserves for uncollectible accounts receivable which, due to their nature, are managed separately. We measure managed working capital as a percentage of the prior three months annualized sales to evaluate our performance based on recent levels of business volume. At June 30, 2021, managed working capital increased as a percentage of annualized total ATI sales to 47.9% compared to 40.5% at December 31, 2020. The $115.0 million increase in managed working capital at June 30, 2021 from December 31, 2020 is detailed in the table below. Days sales outstanding, which measures actual collection

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timing for accounts receivable, improved by 8% as of June 30, 2021 compared to year end 2020. Gross inventory turns, which exclude the effect of LIFO and any applicable offsetting NRV inventory valuation reserves, were consistent as of June 30, 2021 compared to year end 2020.

The components of managed working capital at June 30, 2021 and December 31, 2020 were as follows: 

	June 30,			December 31,
(In millions)	2021			2020
Accounts receivable	$	362.2		$	345.8
Short-term contract assets	52.3			38.9
Inventory	1,059.0			997.1
Accounts payable	(265.8)			(290.6)
Short-term contract liabilities	(103.8)			(111.8)
Subtotal	1,103.9			979.4
Allowance for doubtful accounts	3.9			4.3
Adjustment from current cost to LIFO cost basis	(29.9)			(44.1)
Inventory valuation reserves	103.6			126.9
Managed working capital	$	1,181.5		$	1,066.5
Annualized prior 3 months sales	$	2,464.8		$	2,633.2
Managed working capital as a % of annualized sales	47.9		%	40.5		%
Change in managed working capital from December 31, 2020	$	115.0

Cash used in investing activities was $58.8 million in the first six months of 2021, reflecting $61.4 million in capital expenditures primarily related to HPMC growth projects including the new iso-thermal press and heat-treating expansion in Cudahy, WI. We expect to fund our capital expenditures with cash on hand and cash flow generated from our operations and, if needed, by using a portion of the ABL facility.

Cash used in financing activities was $12.0 million in the first six months of 2021. Cash provided by financing activities was $124.5 million in the first half of 2020 and consisted primarily of $285.0 million of borrowings for the 2025 Convertible Notes issued in June 2020 and $100.0 million of additional Term Loan borrowings under the ABL. These were offset by a $203.2 million repayment for a portion of the 2022 Convertible Notes and $19.1 million cash make-whole payment related to the early extinguishment of these 2022 Convertible Notes as required by the applicable indenture, as well as $19.0 million to pay the cost of capped call transactions and $8.1 million for debt issuance costs, both associated with the newly issued 2025 Convertible Notes.

At June 30, 2021, cash and cash equivalents on hand totaled $472.5 million, a decrease of $173.4 million from year end 2020. Cash and cash equivalents held by our foreign subsidiaries was $101.2 million at June 30, 2021, of which $47.2 million was held by the STAL joint venture.

Debt

Total debt outstanding of $1,635.7 million at June 30, 2021 increased $6.6 million compared to December 31, 2020. Total debt outstanding as described above excludes debt issuance costs and the December 31, 2020 amount includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes. ATI adopted new accounting guidance in 2021 that reclassifies this portion of the 2025 Convertible Notes recorded in stockholders’ equity to long-term debt (see below for further discussion).

In managing our overall capital structure, some of the measures on which we focus are the ratios of: debt to EBITDA, which measures our ability to repay our incurred debt; net debt to total capitalization, which is the percentage of our debt, net of cash that may be available to reduce borrowings, to our total invested and borrowed capital; and total debt to total capitalization, which excludes cash balances. We define EBITDA as income from continuing operations before interest and income taxes, plus depreciation and amortization, goodwill impairment charges and debt extinguishment charges for the latest 12 month period. We define Adjusted EBITDA as EBITDA excluding significant non-recurring charges or credits, restructuring charges/credits, strike related costs, long-lived asset impairments and other postretirement/pension curtailment and settlement gains and losses. We believe that EBITDA and Adjusted EBITDA are useful to investors because these measures are commonly used to analyze companies on the basis of operating performance, leverage and liquidity. Furthermore, analogous measures are used by industry analysts to evaluate operating performance. EBITDA and Adjusted EBITDA are not intended to be measures of free

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cash flow for management’s discretionary use, as they do not consider certain cash requirements such as interest payments, tax payments and capital expenditures. EBITDA and Adjusted EBITDA are not intended to represent, and should not be considered more meaningful than, or as alternatives to, a measure of operating performance as determined in accordance with U.S. generally accepted accounting principles.

All of these leverage ratios worsened in 2021, primarily as a result of higher net debt and lower adjusted EBITDA as calculated on a trailing twelve-month basis and reflecting a greater portion of COVID-19 pandemic impacts on June 30, 2021 ratios. As of June 30, 2021, our debt to Adjusted EBITDA ratio was 10.49, compared to 8.30 at December 31, 2020, and net debt to Adjusted EBITDA ratio was 7.46, compared to 5.01 at December 31, 2020.

	Three months ended				Latest 12 months ended		Fiscal year ended
	June 30, 2021		June 30, 2020		June 30, 2021		December 31, 2020
Loss before income taxes	$	(40.4)	$	(327.3)	$	(1,226.3)	$	(1,481.9)
Interest expense	23.7		21.7		97.9		94.4
Depreciation and amortization	36.3		35.6		142.8		143.3
Restructuring and other charges (credits)	(6.2)		16.7		1,101.2		1,132.1
Strike related costs	40.3		—		40.3		—
Joint venture restructuring charge	—		2.4		—		2.4
Impairment of goodwill	—		287.0		—		287.0
Debt extinguishment charge	—		21.5		—		21.5
Gain on asset sales	—		—		—		(2.5)
Adjusted EBITDA	$	53.7	$	57.6	$	155.9	$	196.3
Total debt (a)					$	1,635.7	$	1,629.1
Less: Cash					(472.5)		(645.9)
Net debt					$	1,163.2	$	983.2
Debt to Adjusted EBITDA					10.49		8.30
Net Debt to Adjusted EBITDA					7.46		5.01

Net debt as a percentage of total capitalization was 71.1% at June 30, 2021, compared to 67.6% at December 31, 2020, primarily reflecting lower cash balances.  

(In millions)	June 30, 2021			December 31, 2020
Total debt (a)	$	1,635.7		$	1,629.1
Less: Cash	(472.5)			(645.9)
Net debt	$	1,163.2		$	983.2
Total ATI stockholders’ equity (b)	473.0			471.3
Net ATI total capital	$	1,636.2		$	1,454.5
Net debt to ATI total capital	71.1		%	67.6		%

Total debt to total capitalization of 77.6% at June 30, 2021 was consistent with December 31, 2020.

(In millions)	June 30, 2021			December 31, 2020
Total debt (a)	$	1,635.7		$	1,629.1
Total ATI stockholders’ equity (b)	473.0			471.3
Total ATI capital	$	2,108.7		$	2,100.4
Total debt to total ATI capital	77.6		%	77.6		%

(a) Excludes debt issuance costs for both periods. The December 31, 2020 debt carrying value includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes. New accounting guidance adopted by ATI on January 1, 2021 eliminated this requirement of separately accounting for this component of the 2025 Convertible Notes in stockholders’ equity. See below for further discussion.

(b) The December 31, 2020 balance excludes $49.8 million recorded in stockholders’ equity for a portion of the 2025 Convertible Notes, net of debt issuance costs. See below for further discussion.

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In June 2020, we issued and sold $285.0 million aggregate principal amount of the 2025 Convertible Notes. We granted the underwriters a 13-day option to purchase up to an additional $40.0 million aggregate principal amount of 2025 Convertible Notes on the same terms and conditions to cover over-allotments, if any. The underwriters exercised a portion of this option on June 30, 2020, and we completed the offering and sale of an additional $6.4 million aggregate principal amount of 2025 Convertible Notes on July 2, 2020, subsequent to the end of the second quarter 2020. Interest on the 2025 Convertible Notes at the 3.5% cash coupon rate is payable semi-annually in arrears on each June 15 and December 15, commencing December 15, 2020.

We used a portion of the net proceeds from the offering of the 2025 Convertible Notes to repurchase $203.2 million aggregate principal amount of our outstanding 2022 Convertible Notes, resulting in a $21.5 million debt extinguishment charge, which included a $19.1 million cash make-whole payment related to the early extinguishment of the 2022 Convertible Notes as required by the applicable indenture, and a $2.4 million charge for deferred debt issue costs. We also used $19.0 million of the net proceeds of the offering of the 2025 Convertible Notes to pay the cost of capped call transactions, described below, which was recorded as a reduction to additional paid-in-capital in stockholders’ equity on the consolidated balance sheet. The remainder of the net proceeds from the offering is being used for general corporate purposes.

In connection with the pricing of the 2025 Convertible Notes, we entered into privately negotiated capped call transactions with certain of the initial purchasers or their respective affiliates (collectively, the Counterparties). The capped call transactions are expected generally to reduce potential dilution to our common stock upon any conversion of the 2025 Convertible Notes and/or offset any cash payments we are required to make in excess of the principal amount of converted 2025 Convertible Notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. The cap price of the capped call transactions initially is approximately $19.76 per share, and is subject to adjustments under the terms of the capped call transactions. We entered into additional capped call transactions with the Counterparties related to the additional $6.4 million aggregate principal amount of the 2025 Convertible Notes issued on July 2, 2020, subsequent to the end of the second quarter 2020.

The 2025 Convertible Notes are convertible into our common stock at an initial conversion price of $15.49 per share and may be settled in cash, shares of our common stock or a combination thereof, at our election. As a result of this flexible settlement feature of the 2025 Convertible Notes, the embedded conversion option valued at $50.3 million is required to be separately accounted for as a component of stockholders’ equity. The value of the embedded conversion option was determined to be $51.4 million based on the estimated fair value of comparable senior unsecured debt without the conversion feature, using an income approach of expected present value. During the 2020 fiscal year, the equity component was amortized as additional non-cash interest expense, commonly referred to as phantom yield, over the term of the 2025 Convertible Notes using the effective interest method. As a result, as of December 31, 2020, $49.8 million of the 2025 Convertible Notes was recorded in additional paid-in-capital in stockholders’ equity ($51.4 million of the gross $291.4 million, net of $1.6 million of allocated offering costs). Due to the non-cash phantom yield and including debt issue cost amortization, the 2025 Convertible Notes had reported interest expense in 2020 at an 8.4% rate, higher than the 3.5% cash coupon rate. Effective January 1, 2021, ATI early-adopted new accounting guidance as discussed in Note 1 that eliminated the equity component classification of the embedded conversion option, as well as the phantom yield portion of interest expense on a prospective basis. Upon adoption on January 1, 2021, long-term debt increased by $45.4 million, representing the $46.8 million equity component of convertible debt as of December 31, 2020, net of reclassified debt issue costs.

Labor Matters

Our CBA with the USW involving approximately 1,100 active full-time represented employees located primarily within the AA&S segment operations, as well as a number of inactive employees, expired on February 28, 2021. USW-represented employees continued to work under the terms of the expired CBA until March 30, 2021 when they engaged in a strike. On July 14, 2021, we announced that a new four-year labor agreement with the USW was ratified, ending the strike. As part of an orderly return to work process, employees will began returning to active employment during the week of July 19, 2021. The new CBA, which covers the term from March 1, 2021 to February 28, 2025, delivers a competitive wage and benefit package to these represented employees, while securing ATI’s ability to reduce its exposure to health care cost inflation, which is critical for the long-term viability of ATI’s SRP business.

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Dividends

We do not currently pay a quarterly dividend. The payment of dividends and the amount of such dividends depends upon matters deemed relevant by our Board of Directors on a quarterly basis, such as our results of operations, financial condition, cash requirements, future prospects, any limitations imposed by law, credit agreements or senior securities, and other factors deemed relevant and appropriate. Under the ABL facility, there is no limit on dividend declarations or payments provided that the undrawn availability, after giving effect to a particular dividend payment, is at least the greater of $150 million and 30% of the sum of the maximum revolving advance amount and the outstanding principal amount of any term loans (the Maximum Loan Amount), and no event of default under the ABL facility has occurred and is continuing or would result from paying the dividend.  In addition, there is no limit on dividend declarations or payments if the undrawn availability is less than the greater of $150 million and 30% of the Maximum Loan Amount but more than the greater of $75 million and 15% of the Maximum Loan Amount, if (i) no event of default has occurred and is continuing or would result from paying the dividend, and (ii) we demonstrate to the administrative agent that, prior to and after giving effect to the payment of the dividend (A) the undrawn availability, as measured both at the time of the dividend payment and as an average for the 60 consecutive day period immediately preceding the dividend payment, is at least the greater of $75 million and 15% of the Maximum Loan Amount, and (B) we maintain a fixed charge coverage ratio of at least 1.00:1.00, as calculated in accordance with the terms of the ABL facility.

Critical Accounting Policies

Inventory

At June 30, 2021, we had net inventory of $1,059.0 million. Inventories are stated at the lower of cost (LIFO, first-in, first-out (FIFO) and average cost methods) or market. Costs include direct material, direct labor and applicable manufacturing and engineering overhead, and other direct costs. Most of our inventory is valued utilizing the LIFO costing methodology. Inventory of our non-U.S. operations is valued using average cost or FIFO methods. Under the LIFO inventory valuation method, changes in the cost of raw materials and production activities are recognized in cost of sales in the current period even though these material and other costs may have been incurred at significantly different values due to the length of time of our production cycle. In a period of rising prices, cost of sales expense recognized under LIFO is generally higher than the cash costs incurred to acquire the inventory sold. Conversely, in a period of declining raw material prices, cost of sales recognized under LIFO is generally lower than cash costs incurred to acquire the inventory sold. Generally, over time based on overall inflationary trends in raw materials, labor and overhead costs, the use of the LIFO inventory valuation method will result in a LIFO inventory valuation reserve, as the higher current period costs are included in cost of sales and the balance sheet carrying value of inventory is reduced.

Since the LIFO inventory valuation methodology is designed for annual determination, interim estimates of the annual LIFO valuation are required. We recognize the effects of the LIFO inventory valuation method on an interim basis by projecting the expected annual LIFO cost and allocating that projection to the interim quarters equally. These projections of annual LIFO inventory valuation reserve changes are updated quarterly and are evaluated based upon material, labor and overhead costs and projections for such costs at the end of the year plus projections regarding year end inventory levels.

The prices for many of the raw materials we use have been extremely volatile during the past several years, while labor and overhead costs have been generally stable, with a modest inflationary trend. Raw material cost changes typically have the largest impact on the LIFO inventory costing methodology based on the overall proportion of raw material costs to other inventoriable costs. Since we value most of our inventory utilizing the LIFO inventory costing methodology, a fall in material costs generally results in a benefit to operating results by reducing cost of sales and increasing the inventory carrying value, while conversely, a rise in raw material costs generally has a negative effect on our operating results by increasing cost of sales while lowering the carrying value of inventory. For example, for the six months ended June 30, 2021 and 2020, the LIFO inventory valuation method resulted in cost of sales that were $14.1 million higher and $14.0 million lower, respectively, than would have been recognized under the FIFO methodology to value our inventory.

Due primarily to persistent raw material deflation in prior years, we are in the unusual situation of having a LIFO inventory balance that exceeds replacement cost. In cases where inventory at FIFO cost is lower than the LIFO carrying value, a write-down of the inventory to market may be required, subject to a lower of cost or market evaluation. In applying the lower of cost or market principle, market means current replacement cost, subject to a ceiling (market value shall not exceed net realizable value) and a floor (market shall not be less than net realizable value reduced by an allowance for a normal profit margin). We evaluate product lines on a quarterly basis to identify inventory values that exceed estimated net realizable value. The calculation of a resulting NRV inventory reserve, if any, is recognized in the period that the need for the reserve is identified. Our NRV reserves were $29.9 million at June 30, 2021 and $44.1 million at December 31, 2020.

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The impact to our cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):

	Six months ended June 30,
	2021		2020
LIFO benefit (charge)	$	(14.1)	$	14.0
NRV benefit (charge)	14.1		(14.0)
Net cost of sales impact	$	—	$	—

It is our general policy to write-down to scrap value any inventory that is identified as obsolete and any inventory that has aged or has not moved in more than twelve months. In some instances this criterion is up to 24 months due to the longer manufacturing and distribution process for such products.

The LIFO inventory valuation methodology is not utilized by many of the companies with which we compete, including foreign competitors. As such, our results of operations may not be comparable to those of our competitors during periods of volatile material costs due, in part, to the differences between the LIFO inventory valuation method and other acceptable inventory valuation methods.

Asset Impairment

We monitor the recoverability of the carrying value of our long-lived assets. An impairment charge is recognized when the expected net undiscounted future cash flows from an asset’s use (including any proceeds from disposition) are less than the asset’s carrying value, and the asset’s carrying value exceeds its fair value. Changes in the expected use of a long-lived asset group, and the financial performance of the long-lived asset group and its operating segment, are evaluated as indicators of possible impairment. Future cash flow value may include appraisals for property, plant and equipment, land and improvements, future cash flow estimates from operating the long-lived assets, and other operating considerations. In the fourth quarter of each year in conjunction with the annual business planning cycle, or more frequently if new material information is available, we evaluate the recoverability of idled facilities.

Goodwill is reviewed annually in the fourth quarter of each year for impairment or more frequently if impairment indicators arise. Other events and changes in circumstances may also require goodwill to be tested for impairment between annual measurement dates. At June 30, 2021, we had $241.9 million of goodwill on our consolidated balance sheet, an increase of $1.2 million from December 31, 2020 due to foreign currency translation on goodwill denominated in functional currencies other than the U.S. dollar. All goodwill relates to reporting units in the HPMC segment.

Management concluded that none of ATI’s reporting units or long-lived assets experienced any triggering event that would have required an interim impairment analysis at June 30, 2021.

During the second quarter of 2020, we performed an interim goodwill impairment analysis on the Forged Products reporting unit and its $460.4 million goodwill balance based on assessed potential indicators of impairment, including recent disruptions to the global commercial aerospace market resulting from the COVID-19 pandemic, and the increasing uncertainty of near-term demand requirements of aero-engine and airframe markets based on government responses to the pandemic and ongoing interactions with customers. As a result of the second quarter 2020 interim goodwill impairment evaluation, we determined that the fair value of the Forged Products reporting unit was below carrying value, including goodwill, by $287.0 million. This was primarily due to changes in the timing and amount of expected cash flows resulting from lower projected revenues, profitability and cash flows due to near-term reductions in commercial aerospace market demand. Consequently, during the second quarter of 2020, we recorded a $287.0 million impairment charge for the partial impairment of Forged Products reporting unit goodwill, most of which was assigned from the Company’s 2011 Ladish acquisition that was not deductible for income tax purposes.

Income Taxes

The provision for, or benefit from, income taxes includes deferred taxes resulting from temporary differences in income for financial and tax purposes using the liability method. Such temporary differences result primarily from differences in the carrying value of assets and liabilities. Future realization of deferred income tax assets requires sufficient taxable income within the carryback and/or carryforward period available under tax law. On a quarterly basis, we evaluate the realizability of our deferred tax assets.

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The evaluation includes the consideration of all available evidence, both positive and negative, regarding historical operating results including recent years with reported losses, the estimated timing of future reversals of existing taxable temporary differences, estimated future taxable income exclusive of reversing temporary differences and carryforwards, and potential tax planning strategies which may be employed to prevent an operating loss or tax credit carryforward from expiring unused. In situations where a three-year cumulative loss condition exists, accounting standards limit the ability to consider projections of future results as positive evidence to assess the realizability of deferred tax assets. Valuation allowances are established when it is estimated that it is more likely than not that the tax benefit of the deferred tax asset will not be realized.

Since the second quarter of 2020, our results reflected a three year cumulative loss from U.S. operations. As a result, we established deferred tax asset valuation allowances in the second quarter of 2020 on our U.S. Federal and state deferred tax assets. In 2021, ATI continues to maintain income tax valuation allowances on its U.S. Federal and state deferred tax assets. In addition, we have $38.7 million of valuation allowances on amounts recorded in other comprehensive loss as of June 30, 2021.

While we remain in a cumulative loss condition, our ability to evaluate the realizability of deferred tax assets is generally limited to the ability to offset timing differences on taxable income associated with deferred tax liabilities. Therefore, a change in estimate of deferred tax asset valuation allowances for federal, state, or foreign jurisdictions during this cumulative loss condition period will primarily be affected by changes in estimates of the time periods that deferred tax assets and liabilities will be realized, or on a limited basis to tax planning strategies that may result in a change in the amount of taxable income realized.

Over the past year, the U.S. government has enacted various relief packages in response to the COVID-19 pandemic. Due to our valuation allowance in the U.S., the impact to income tax expense has been minimal. We are currently assessing payroll tax refund and other cost-share opportunities.

Retirement Benefits

In accordance with accounting standards, we determine the discount rate used to value pension plan liabilities as of the last day of each year. The discount rate reflects the current rate at which the pension liabilities could be effectively settled. In estimating this rate, we receive input from our actuaries regarding the rate of return on high quality, fixed income investments with maturities matched to the expected future retirement benefit payments. The estimated effect at the year-end 2020 valuation date of an increase in the discount rate by 0.50% would decrease pension liabilities by approximately $155 million. The effect on pension liabilities for changes to the discount rate, the difference between expected and actual plan asset returns, and the net effect of other changes in actuarial assumptions and experience are deferred and amortized over future periods in accordance with accounting standards.

For ERISA (Employee Retirement Income Security Act of 1974, as amended) funding purposes, discount rates used to measure pension liabilities for U.S. qualified defined benefit plans are calculated on a different basis using an IRS-determined segmented yield curve, which currently results in a higher discount rate than the discount rate methodology required by accounting standards. Funding requirements are also affected by IRS-determined mortality assumptions, which may differ from those used under accounting standards.

We have certain CBAs that include participation in a multiemployer pension plan. Under current law, an employer that withdraws or partially withdraws from a multiemployer pension plan may incur a withdrawal liability to the plan, which represents the portion of the plan’s underfunding that is allocable to the withdrawing employer under very complex actuarial and allocation rules. A subsidiary of the Company participates in the Steelworkers Western Independent Shops Pension Plan (WISPP) for union-represented employees of our primary titanium operations in Albany, OR, which is funded on an hours-worked basis. A significant reduction or the elimination of hours-worked contributions due to changes in operating rates at this facility could result in a withdrawal liability assessment. As of the WISPP fiscal plan year ended September 30, 2018, which is the most recent information available from the Plan Administrator, our subsidiary’s liability for a complete withdrawal was estimated by the Plan Administrator to be approximately $38 million on an undiscounted basis. If the withdrawal liability was incurred, we estimate that payments of this obligation would be required on a straight-line basis over a 20 year period.

Other Critical Accounting Policies

A summary of other significant accounting policies is discussed in Management’s Discussion and Analysis of Financial Condition and Results of Operations and in Note 1 to the consolidated financial statements contained in our Annual Report on Form 10-K for the year ended December 31, 2020.

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The preparation of the financial statements in accordance with U.S. generally accepted accounting principles requires us to make judgments, estimates and assumptions regarding uncertainties that affect the reported amounts of assets and liabilities. Significant areas of uncertainty that require judgments, estimates and assumptions include the accounting for derivatives, retirement plans, income taxes, environmental and other contingencies as well as asset impairment, inventory valuation and collectability of accounts receivable. We use historical and other information that we consider to be relevant to make these judgments and estimates. However, actual results may differ from those estimates and assumptions that are used to prepare our financial statements.

Pending Accounting Pronouncements

See Note 1 of the Notes to Consolidated Financial Statements for information on new and pending accounting pronouncements.

Forward-Looking and Other Statements

From time to time, we have made and may continue to make “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Certain statements in this report relate to future events and expectations and, as such, constitute forward-looking statements. Forward-looking statements include those containing such words as “anticipates,” “believes,” “estimates,” “expects,” “would,” “should,” “will,” “will likely result,” “forecast,” “outlook,” “projects,” and similar expressions. Forward-looking statements are based on management’s current expectations and include known and unknown risks, uncertainties and other factors, many of which we are unable to predict or control, that may cause our actual results, performance or achievements to differ materially from those expressed or implied in the forward-looking statements. Important factors that could cause actual results to differ materially from those in the forward-looking statements include: (a) material adverse changes in economic or industry conditions generally, including global supply and demand conditions and prices for our specialty metals and changes in international trade duties and other aspects of international trade policy; (b) material adverse changes in the markets we serve; (c) our inability to achieve the level of cost savings, productivity improvements, synergies, growth or other benefits anticipated by management, from strategic investments and the integration of acquired businesses; (d) volatility in the price and availability of the raw materials that are critical to the manufacture of our products; (e) declines in the value of our defined benefit pension plan assets or unfavorable changes in laws or regulations that govern pension plan funding; (f) labor disputes or work stoppages; (g) equipment outages; (h) the risks of business and economic disruption related to the currently ongoing COVID-19 pandemic and other health epidemics or outbreaks that may arise; and (i) other risk factors summarized in our Annual Report on Form 10-K for the year ended December 31, 2020, and in other reports filed with the Securities and Exchange Commission. We assume no duty to update our forward-looking statements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

As part of our risk management strategy, we utilize derivative financial instruments, from time to time, to hedge our exposure to changes in energy and raw material prices, foreign currencies, and interest rates. We monitor the third-party financial institutions which are our counterparties to these financial instruments on a daily basis and diversify our transactions among counterparties to minimize exposure to any one of these entities. Fair values for derivatives were measured using exchange-traded prices for the hedged items including consideration of counterparty risk and the Company’s credit risk. Our exposure to volatility in interest rates is presently not material, as nearly all of our debt is at fixed interest rates.

Volatility of Interest Rates. We may enter into derivative interest rate contracts to maintain a reasonable balance between fixed- and floating-rate debt. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed rate. The swap matures in June 2024. The Company designated the interest rate swap as a cash flow hedge of the Company’s exposure to the variability of the payment of interest on a portion of its Term Loan borrowings. The ineffectiveness at hedge inception, determined from the fair value of the swap immediately prior to its July 2019 amendment, was amortized to interest expense over the initial Term Loan swap maturity date of January 12, 2021. Any gain or loss associated with this hedging arrangement is included in interest expense. At June 30, 2021, the net mark-to-market valuation of the outstanding interest rate swap was an unrealized pre-tax loss of $2.6 million, comprised of $1.0 million in other current liabilities and $1.6 million in other long-term liabilities on the balance sheet.

Volatility of Energy Prices. Energy resources markets are subject to conditions that create uncertainty in the prices and availability of energy resources. The prices for and availability of electricity, natural gas, oil and other energy resources are subject to volatile market conditions. These market conditions often are affected by political and economic factors beyond our control. Increases in energy costs, or changes in costs relative to energy costs paid by competitors, have and may continue to adversely affect our profitability. To the extent that these uncertainties cause suppliers and customers to be more cost sensitive, increased energy prices may have an adverse effect on our results of operations and financial condition. We use approximately 5 to 7 million MMBtu’s of natural gas annually, depending upon business conditions, in the manufacture of our products.

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These purchases of natural gas expose us to risk of higher gas prices. For example, a hypothetical $1.00 per MMBtu increase in the price of natural gas would result in increased annual energy costs of approximately $5 to $7 million. We use several approaches to minimize any material adverse effect on our results of operations or financial condition from volatile energy prices. These approaches include incorporating an energy surcharge on many of our products and using financial derivatives to reduce exposure to energy price volatility.

At June 30, 2021, the outstanding financial derivatives used to hedge our exposure to energy cost volatility included natural gas hedges. Approximately 70% of our forecasted domestic requirements for natural gas for the remainder of 2021 and approximately 25% for 2022 are hedged. At June 30, 2021, the net mark-to-market valuation of these outstanding natural gas hedges was an unrealized pre-tax gain of $3.0 million, comprised of $2.6 million in prepaid expenses and other current assets and $0.4 million in other long-term assets on the balance sheet. For the three months ended June 30, 2021, natural gas hedging activity decreased cost of sales of $0.3 million.

Volatility of Raw Material Prices. We use raw materials surcharge and index mechanisms to offset the impact of increased raw material costs; however, competitive factors in the marketplace can limit our ability to institute such mechanisms, and there can be a delay between the increase in the price of raw materials and the realization of the benefit of such mechanisms. For example, in 2020, we used approximately 50 million pounds of nickel; therefore, a hypothetical change of $1.00 per pound in nickel prices would result in increased costs of approximately $50 million. In addition, in 2020, we also used approximately 300 million pounds of ferrous scrap in the production of our flat-rolled products; a hypothetical change of $0.01 per pound would result in increased costs of approximately $3.0 million. While we enter into raw materials futures contracts from time-to-time to hedge exposure to price fluctuations, such as for nickel, we cannot be certain that our hedge position adequately reduces exposure. We believe that we have adequate controls to monitor these contracts, but we may not be able to accurately assess exposure to price volatility in the markets for critical raw materials.

The majority of our products are sold utilizing raw material surcharges and index mechanisms. However, as of June 30, 2021, we had entered into financial hedging arrangements, primarily at the request of our customers, related to firm orders for an aggregate notional amount of approximately 5 million pounds of nickel with hedge dates through 2023. The aggregate notional amount hedged is approximately 10% of a single year’s estimated nickel raw material purchase requirements. Any gain or loss associated with these hedging arrangements is included in cost of sales. At June 30, 2021, the net mark-to-market valuation of our outstanding raw material hedges was an unrealized pre-tax gain of $4.6 million, comprised of $3.8 million in prepaid expense and other current assets and $0.8 million in other long-term assets on the balance sheet.

Foreign Currency Risk. Foreign currency exchange contracts are used, from time-to-time, to limit transactional exposure to changes in currency exchange rates. We sometimes purchase foreign currency forward contracts that permit us to sell specified amounts of foreign currencies expected to be received from our export sales for pre-established U.S. dollar amounts at specified dates. The forward contracts are denominated in the same foreign currencies in which export sales are denominated. These contracts are designated as hedges of the variability in cash flows of a portion of the forecasted future export sales transactions which otherwise would expose the Company to foreign currency risk, primarily the euro. In addition, we may also hedge forecasted capital expenditures and designate cash balances held in foreign currencies as hedges of forecasted foreign currency transactions. At June 30, 2021, we had no significant outstanding foreign currency forward contracts.

Item 4. Controls and Procedures

(a) Evaluation of Disclosure Controls and Procedures

Our Chief Executive Officer and Chief Financial Officer have evaluated the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended) as of June 30, 2021, and they concluded that these disclosure controls and procedures are effective.

(b) Changes in Internal Controls

There was no change in our internal controls over financial reporting identified in connection with the evaluation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) under the Securities Exchange Act of 1934, as amended) as of June 30, 2021 conducted by our Chief Executive Officer and Chief Financial Officer, that occurred during the quarter ended June 30, 2021 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

A number of lawsuits, claims and proceedings have been or may be asserted against the Company relating to the conduct of its currently or formerly owned businesses, including those pertaining to product liability, environmental, health and safety matters and occupational disease (including as each relates to alleged asbestos exposure), as well as patent infringement, commercial, government contracting, construction, employment, employee and retiree benefits, taxes, environmental, and stockholder and corporate governance matters. Certain of such lawsuits, claims and proceedings are described in our Annual Report on Form 10-K for the year ended December 31, 2020, and addressed in Note 15 to the unaudited interim financial statements included herein. While the outcome of litigation cannot be predicted with certainty, and some of these lawsuits, claims or proceedings may be determined adversely to the Company, management does not believe that the disposition of any such pending matters is likely to have a material adverse effect on the Company’s financial condition or liquidity, although the resolution in any reporting period of one or more of these matters could have a material adverse effect on the Company’s results of operations for that period.

Allegheny Technologies Incorporated and its subsidiary, ATI Titanium LLC (ATI Titanium), are parties to a lawsuit captioned US Magnesium, LLC v. ATI Titanium LLC (Case No. 2:17-cv-00923-DB) and filed in federal district court in Salt Lake City, UT, pertaining to a Supply and Operating Agreement between US Magnesium LLC (USM) and ATI Titanium entered into in 2006 (the Supply Agreement). In 2016, ATI Titanium notified USM that it would suspend performance under the Supply Agreement in reliance on certain terms and conditions included in the Supply Agreement. USM subsequently filed a claim challenging ATI Titanium’s right to suspend performance under the Supply Agreement, claiming that such suspension was a material breach of the Supply Agreement and seeking monetary damages, and ATI Titanium filed a counterclaim for breach of contract against USM. In 2018, USM obtained leave of the court to add Allegheny Technologies Incorporated as a separate party defendant, and ATI Titanium filed a motion to dismiss the claim against Allegheny Technologies Incorporated, which the court denied on April 19, 2019. No trial date has been set by the court given the restrictions of the pandemic. While ATI intends to vigorously defend against and pursue these claims, it cannot predict their outcomes at this time.

Item 1A. Risk Factors

The following is an update to, and should be read in conjunction with Item 1A. Risk Factors contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020. In addition to the other information set forth in this report, you should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2020, which could materially affect our business, financial condition or future results.  The risks described in our Annual Report on Form 10-K are not the only risks facing our Company.  Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

Labor Matters. We have approximately 6,500 active employees, of which approximately 20% are located outside the United States. Approximately 40% of our workforce is covered by various CBAs, predominantly with the USW. At various times, our CBAs expire and are subject to renegotiation.

Generally, CBAs that expire may be terminated after notice by the union. After termination, the union may authorize a strike. A labor dispute, which could lead to a strike, lockout, or other work stoppage by the employees covered by one or more of the CBAs, could have a material adverse effect on production at one or more of our facilities and, depending upon the length of such dispute or work stoppage, on our operating results. There can be no assurance that we will succeed in concluding CBAs to replace those that expire.

The Company’s CBA with the USW involving approximately 1,100 active full-time represented employees located primarily within the AA&S segment operations, as well as a number of inactive employees, expired on February 28, 2021. USW-represented employees continued to work under the terms of the expired CBA until March 30, 2021 when they engaged in a strike. On July 14, 2021, ATI announced that a new four-year labor agreement was ratified with the USW, ending the strike. We expect to continue to be negatively impacted in the third quarter of 2021 by lingering effects from the USW strike as workers return and production ramps back toward pre-strike levels.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Set forth below is information regarding the Company’s stock repurchases during the period covered by this report, comprising shares repurchased by ATI from employees to satisfy employee-owed taxes on share-based compensation.

Period	Total Number of Shares (or Units) Purchased	Average Price Paid per Share (or Unit)		Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
April 1-30, 2021	265	$	21.66	—	$	—
May 1-31, 2021	—	$	—	—	$	—
June 1-30, 2021	—	$	—	—	$	—
Total	265	$	21.66	—	$	—

Item 6. Exhibits

(a) Exhibits

10.1	Addendum to Performance-Vested Restricted Stock Unit Agreement (filed herewith).
31.1	Certification of Chief Executive Officer required by Securities and Exchange Commission Rule 13a – 14(a) or 15d – 14(a) (filed herewith).
31.2	Certification of Chief Financial Officer required by Securities and Exchange Commission Rule 13a – 14(a) or 15d – 14(a) (filed herewith).
32.1	Certification pursuant to 18 U.S.C. Section 1350 (furnished herewith).
101.INS	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document.
104	Cover Page Interactive Data File - the cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ALLEGHENY TECHNOLOGIES INCORPORATED

(Registrant)

Date:	August 3, 2021	By	/s/ Donald P. Newman
			Donald P. Newman
			Senior Vice President, Finance and Chief Financial Officer (Principal Financial Officer)
Date:	August 3, 2021	By	/s/ Karl D. Schwartz
			Karl D. Schwartz
			Vice President, Controller and Chief Accounting Officer (Principal Accounting Officer)

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EX-10.1

Exhibit 10.1

ADDENDUM TO

PERFORMANCE-VESTED RESTRICTED STOCK UNIT AGREEMENT

PURSUANT TO THE

ALLEGHENY TECHNOLOGIES INCORPORATED 2020 INCENTIVE PLAN

This Addendum (this “Addendum”) to that certain Performance-Vested Restricted Stock Unit Agreement (the “Agreement”) dated as of the 4th day of January, 2021 (the “Grant Date”) by and between ALLEGHENY TECHNOLOGIES INCORPORATED, a Delaware company (the “Company”), and certain Participants in the Incentive Plan, as defined such terms are defined in the Agreement, amends the Agreement as follows:

WHEREAS, the Company sponsors and maintains the Allegheny Technologies Incorporated 2020 Incentive Plan (the “Incentive Plan”);

WHEREAS, the Company desires to encourage the Participant to remain an employee of the Company and, during such employment, to contribute substantially to the financial performance of the Company;

WHEREAS, to provide that incentive, the Company awarded the Participant certain performance-vested restricted stock units (singular “PSU” and plural “PSUs”) as set forth in the Agreement;

WHEREAS, the PSUs are subject to the Company attaining a level of relative total shareholder return (“TSR”) over specific Measurement Periods as specified in the Agreement;

WHEREAS, due to administrative error, Appendix A to the Agreement mistakenly defined “Fair Market Value” for purposes of calculating the Company’s TSR as the average of the high and low trading prices of a share of the Company’s common stock, par value $0.10 per share (the “Common Stock”) on the New York Stock Exchange (the “NYSE”);

WHEREAS, as approved by the Company’s Board of Directors, “Fair Market Value” for such purpose on any given trading day should have been defined as the closing price of the Common Stock on the NYSE. Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Incentive Plan.

NOW, THEREFORE, in consideration of the mutual promises and covenants contained in the Agreement, Appendix A to the Agreement is hereby amended and restated in its entirely and replaced with the attached Appendix A, which correctly defines the term “Fair Market Value.”

[Remainder of Page Intentionally Blank]

Appendix A

TSR Peer Group and Methodology

Peer Group

Reliance Steel & Aluminum Co.

Steel Dynamics, Inc.

Wabtec Corporation

Oshkosh Corporation

Arconic Corporation

Commercial Metals Company

Howmet Aerospace Inc.

The Timken Company

Terex Corporation

Crane Co.

Worthington Industries, Inc.

Moog Inc.

Trinity Industries, Inc.

Valmont Industries, Inc.

Carpenter Technology Corporation

Kennametal Inc.

Schnitzer Steel Industries, Inc.

SPX Flow, Inc.

Calculation Methodology

Total Shareholder Return is calculated based on the Fair Market Value of a share of Common Stock as of the end of each individual independent Measurement Period and the end of the Performance Period, plus dividends paid as if they had been reinvested on each ex-dividend date during each Measurement Period and the Performance Period, as applicable, divided by the Fair Market Value of a share of Common Stock at the beginning of the Performance Period. For purposes of determining the Company’s Total Shareholder Return:

•“Fair Market Value” means, as of any given date, the closing price of the Common Stock on the New York Stock Exchange (the “NYSE”) or, if the Common Stock is not then traded on the NYSE, on such other national securities exchange on which the Common Stock is admitted to trade, or, if none, on the National Association of Securities Dealers Automated Quotation System if the Common Stock is admitted for quotation thereon; provided, however, that if there were no sales reported as of such date, Fair Market Value shall be computed as of the last date preceding such date on which a sale was reported, provided, further, that if any such exchange or quotation system is closed on any day on which Fair Market Value is to be determined, Fair Market Value shall be determined as of the first date immediately preceding such date on which such exchange or quotation system was open for trading.

•For purposes of determining the Fair Market Value of a share of Common Stock at the beginning and end of each Measurement Period and the Performance Period, the value shall be determined as the average Fair Market Value for the twenty (20) trading days immediately preceding, respectively, the first day of the Performance Period, and last day of each Measurement Period and the Performance Period.

Calculation of Relative Total Shareholder Return: The extent to which the number of PSUs which become vested under this Agreement shall be determined by measuring the Company’s Total Shareholder Return as a percentage ranking in comparison with the Peer Group Total Shareholder Return, as calculated using the above-stated principles, with the Company included in the group. The determination of whether the Company’s Total Shareholder Return is negative for the three-year Performance Period ending December 31, 2023 shall be determined using the above-stated principles. Adjustments and actions with respect to the Company and any peer group company shall be in accord with the provisions of Appendix C.

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, Robert S. Wetherbee certify that:

1.I have reviewed this quarterly report on Form 10-Q of Allegheny Technologies Incorporated;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 3, 2021

/s/ Robert S. Wetherbee

Robert S. Wetherbee

President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Donald P. Newman certify that:

1.I have reviewed this quarterly report on Form 10-Q of Allegheny Technologies Incorporated;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 3, 2021

/s/ Donald P. Newman

Donald P. Newman

Senior Vice President, Finance and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Allegheny Technologies Incorporated (the “Company”) on Form 10-Q for the period ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned, in the capacities and on the dates indicated below, hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 3, 2021	/s/ Robert S. Wetherbee
		Robert S. Wetherbee
		President and Chief Executive Officer
Date:	August 3, 2021	/s/ Donald P. Newman
		Donald P. Newman
		Senior Vice President, Finance and Chief Financial Officer

XML

Cover - shares	6 Months Ended
	Jun. 30, 2021	Jul. 16, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	1-12001
Entity Registrant Name	ALLEGHENY TECHNOLOGIES INCORPORATED
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	25-1792394
Entity Address, Address Line One	1000 Six PPG Place
Entity Address, City or Town	Pittsburgh,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15222-5479
City Area Code	412
Local Phone Number	394-2800
Title of 12(b) Security	Common stock, par value $0.10
Trading Symbol	ATI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		127,245,632
Amendment Flag	false
Entity Central Index Key	0001018963
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 472.5	$ 645.9
Accounts receivable, net	362.2	345.8
Short-term contract assets	52.3	38.9
Inventories, net	1,059.0	997.1
Prepaid expenses and other current assets	50.5	38.3
Total current assets	1,996.5	2,066.0
Property, plant and equipment, net	1,486.3	1,469.2
Goodwill	241.9	240.7
Other assets	249.3	259.0
Total assets	3,974.0	4,034.9
Current Liabilities:
Accounts payable	265.8	290.6
Short-term contract liabilities	103.8	111.8
Short-term debt and current portion of long-term debt	19.3	17.8
Other current liabilities	210.2	233.1
Total current liabilities	599.1	653.3
Long-term debt	1,602.2	1,550.0
Accrued postretirement benefits	317.1	326.7
Pension liabilities	629.4	673.6
Other long-term liabilities	220.1	189.9
Total liabilities	3,367.9	3,393.5
ATI Stockholders' Equity:
Preferred stock, par value $0.10: authorized-50,000,000 shares; issued-none	0.0	0.0
Common stock, par value $0.10: authorized-500,000,000 shares; issued-127,471,322 shares at June 30, 2021 and 126,820,440 shares at December 31, 2020; outstanding-127,243,908 shares at June 30, 2021 and 126,817,768 shares at December 31, 2020	12.7	12.7
Additional paid-in capital	1,587.5	1,625.5
Retained earnings	53.8	106.5
Treasury stock: 227,414 shares at June 30, 2021 and 2,672 shares at December 31, 2020	(4.7)	0.0
Accumulated other comprehensive loss, net of tax	(1,176.3)	(1,223.6)
Total ATI stockholders’ equity	473.0	521.1
Noncontrolling interests
Noncontrolling interests	133.1	120.3
Total Equity	606.1	641.4
Total Liabilities and Equity	$ 3,974.0	$ 4,034.9

XML

CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, par value (USD per share)	$ 0.10	$ 0.10
Preferred stock, authorized (in shares)	50,000,000	50,000,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (USD per share)	$ 0.10	$ 0.10
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	127,471,322	126,820,440
Common stock, outstanding (in shares)	127,243,908	126,817,768
Treasury stock (in shares)	227,414	2,672

XML

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Sales	$ 616.2	$ 770.3	$ 1,308.7	$ 1,725.8
Cost of sales	573.5	695.6	1,180.2	1,516.3
Gross profit	42.7	74.7	128.5	209.5
Selling and administrative expenses	60.2	44.4	114.2	102.8
Impairment of goodwill	0.0	287.0	0.0	287.0
Restructuring charges (credits)	(6.2)	16.7	(6.2)	24.7
Operating income (loss)	(11.3)	(273.4)	20.5	(205.0)
Nonoperating retirement benefit expense	(6.8)	(11.2)	(13.6)	(22.4)
Interest expense, net	(23.7)	(21.7)	(47.1)	(43.6)
Debt extinguishment charge (See Note 7)	0.0	(21.5)	0.0	(21.5)
Other income (expense), net	1.4	0.5	2.9	(0.4)
Loss before income taxes	(40.4)	(327.3)	(37.3)	(292.9)
Income tax provision	4.0	92.6	9.5	103.4
Net loss	(44.4)	(419.9)	(46.8)	(396.3)
Less: Net income attributable to noncontrolling interests	4.8	2.7	10.3	5.2
Net loss attributable to ATI	$ (49.2)	$ (422.6)	$ (57.1)	$ (401.5)
Basic net loss attributable to ATI per common share (in dollars per share)	$ (0.39)	$ (3.34)	$ (0.45)	$ (3.18)
Diluted net loss attributable to ATI per common share (in dollars per share)	$ (0.39)	$ (3.34)	$ (0.45)	$ (3.18)

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (44.4)	$ (419.9)	$ (46.8)	$ (396.3)
Currency translation adjustment
Unrealized net change arising during the period	7.0	14.2	2.2	(9.2)
Derivatives
Net derivatives gain (loss) on hedge transactions	7.0	2.0	7.4	(10.3)
Reclassification to net loss of net realized (gain) loss	(1.5)	4.2	(3.2)	6.0
Income taxes on derivative transactions	0.0	2.5	0.0	0.0
Total	5.5	3.7	4.2	(4.3)
Postretirement benefit plans
Amortization of net actuarial loss	22.2	21.3	44.4	42.6
Amortization to net loss of net prior service credits	(0.5)	(0.8)	(1.0)	(1.5)
Income taxes on postretirement benefit plans	0.0	(4.9)	0.0	0.0
Total	21.7	25.4	43.4	41.1
Other comprehensive income, net of tax	34.2	43.3	49.8	27.6
Comprehensive income (loss)	(10.2)	(376.6)	3.0	(368.7)
Less: Comprehensive income attributable to noncontrolling interests	6.7	2.2	12.8	3.9
Comprehensive loss attributable to ATI	$ (16.9)	$ (378.8)	$ (9.8)	$ (372.6)

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities:
Net loss	$ (46.8)	$ (396.3)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	72.4	72.9
Deferred taxes	1.0	98.1
Impairment of goodwill	0.0	287.0
Debt extinguishment charge	0.0	21.5
Net gains from disposal of property, plant and equipment	(2.4)	(2.5)
Changes in operating assets and liabilities:
Inventories	(61.9)	51.8
Accounts receivable	(16.4)	70.5
Accounts payable	(24.9)	(245.4)
Retirement benefits	(15.2)	(17.0)
Accrued liabilities and other	(8.4)	45.0
Cash used in operating activities	(102.6)	(14.4)
Investing Activities:
Purchases of property, plant and equipment	(61.4)	(66.0)
Proceeds from disposal of property, plant and equipment	2.7	3.2
Other	(0.1)	1.0
Cash used in investing activities	(58.8)	(61.8)
Financing Activities:
Borrowings on long-term debt	0.7	385.0
Payments on long-term debt and finance leases	(7.1)	(207.2)
Net borrowings (payments) under credit facilities	(0.9)	0.7
Purchase of convertible note capped call	0.0	(19.0)
Debt issuance costs	0.0	(8.1)
Debt extinguishment charge	0.0	(19.1)
Shares repurchased for income tax withholding on share-based compensation and other	(4.7)	(7.8)
Cash provided by (used in) financing activities	(12.0)	124.5
Increase (decrease) in cash and cash equivalents
Increase (decrease) in cash and cash equivalents	(173.4)	48.3
Cash and cash equivalents at beginning of period	645.9	490.8
Cash and cash equivalents at end of period	$ 472.5	$ 539.1

XML

STATEMENTS OF CHANGES IN CONSOLIDATED EQUITY - USD ($) $ in Millions	Total	[CommonStockMember]	Additional Paid-in Capital [Member]	[RetainedEarningsMember]	[TreasuryStockMember]	[AccumulatedOtherComprehensiveIncomeMember]	[NoncontrollingInterestMember]
Total Stockholders' Equity at Dec. 31, 2019	$ 2,193.2	$ 12.7	$ 1,618.0	$ 1,679.3	$ (18.2)	$ (1,201.7)	$ 103.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(396.3)			(401.5)			5.2
Other comprehensive income (loss)	27.6					28.9	(1.3)
Equity component of convertible note	48.7		48.7
Convertible note capped call	(19.0)		(19.0)
Employee stock plans	(11.9)		(29.9)	(0.2)	18.2
Total Stockholders' Equity at Jun. 30, 2020	1,842.3	12.7	1,617.8	1,277.6	0.0	(1,172.8)	107.0
Total Stockholders' Equity at Mar. 31, 2020	2,192.6	12.7	1,592.1	1,700.4	(0.8)	(1,216.6)	104.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(419.9)			(422.6)			2.7
Other comprehensive income (loss)	43.3					43.8	(0.5)
Equity component of convertible note	48.7		48.7
Convertible note capped call	(19.0)		(19.0)
Employee stock plans	(3.4)		(4.0)	(0.2)	0.8
Total Stockholders' Equity at Jun. 30, 2020	1,842.3	12.7	1,617.8	1,277.6	0.0	(1,172.8)	107.0
Total Stockholders' Equity at Dec. 31, 2020	641.4	12.7	1,625.5	106.5	0.0	(1,223.6)	120.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(46.8)			(57.1)			10.3
Other comprehensive income (loss)	49.8					47.3	2.5
Employee stock plans	7.1		11.8	0.0	(4.7)
Total Stockholders' Equity at Jun. 30, 2021	606.1	12.7	1,587.5	53.8	(4.7)	(1,176.3)	133.1
Total Stockholders' Equity at Mar. 31, 2021	609.3	12.7	1,580.5	103.0	(4.7)	(1,208.6)	126.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(44.4)			(49.2)			4.8
Other comprehensive income (loss)	34.2					32.3	1.9
Employee stock plans	7.0		7.0	0.0	0.0
Total Stockholders' Equity at Jun. 30, 2021	$ 606.1	$ 12.7	$ 1,587.5	$ 53.8	$ (4.7)	$ (1,176.3)	$ 133.1

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Accounting Policies

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Accounting Policies

Accounting Policies

The interim consolidated financial statements include the accounts of Allegheny Technologies Incorporated and its subsidiaries. Unless the context requires otherwise, “Allegheny Technologies,” “ATI” and “the Company” refer to Allegheny Technologies Incorporated and its subsidiaries.

These unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by U.S. generally accepted accounting principles for complete financial statements. In management’s opinion, all adjustments (which include only normal recurring adjustments) considered necessary for a fair presentation have been included. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2020 Annual Report on Form 10-K. The results of operations for these interim periods are not necessarily indicative of the operating results for any future period. The December 31, 2020 financial information has been derived from the Company’s audited consolidated financial statements.

New Accounting Pronouncements Adopted

In August 2020, the Financial Accounting Standards Board issued new accounting guidance related to accounting for convertible instruments. Under this new guidance, embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives, or that do not result in substantial premiums accounted for as paid-in capital. As such, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. By removing those separation models, the reported interest rate of convertible debt instruments typically will be closer to the coupon interest rate. The new guidance also addresses how convertible instruments are accounted for in the diluted earnings per share calculation, requiring the if-converted method, and requires enhanced disclosures about the terms of convertible instruments and contracts in an entity’s own equity. This new guidance is effective for the Company in fiscal year 2022, with early adoption permitted.

The Company adopted this new accounting guidance related to accounting for convertible instruments effective January 1, 2021 using the modified transition approach with the cumulative effect recognized as an adjustment to the opening balance of retained earnings. This new guidance is applicable to the Company’s 3.5% Convertible Senior Notes due 2025 (the 2025 Convertible Notes) that were issued in June 2020, for which the embedded conversion option was required to be separately accounted for as a component of stockholders’ equity. Upon adoption on January 1, 2021, long-term debt increased by $45.4 million and stockholders’ equity decreased by the same amount, representing the net impact of two adjustments: (1) the $49.8 million value of the embedded conversion, which is net of allocated offering costs, previously classified in additional paid-in capital in stockholders’ equity, and (2) a $4.4 million increase to retained earnings for the cumulative effect of adoption primarily related to the non-cash interest expense recorded in fiscal year 2020 for the amortization of the portion of the 2025 Convertible Notes allocated to stockholders’ equity. Prospectively, the reported interest expense for the 2025 Convertible Notes will no longer include the non-cash interest expense of the equity component as required under prior accounting standards and will be closer to the 3.5% cash coupon rate. There was no impact to the Company’s earnings per share calculation as it previously applied the if-converted method to the 2025 Convertible Notes given ATI’s flexibility to settle conversions of the 2025 Convertible Notes in cash, shares of ATI’s common stock or a combination thereof, at ATI’s election.

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Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2021

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 of the Company’s overall revenues (in millions) by global and geographical markets for the second quarters and six months ended June 30, 2021 and 2020 were as follows:

(in millions)	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Global Markets:
Aerospace & Defense	$	218.6	$	62.6	$	281.2	$	252.3	$	113.3	$	365.6
Energy*	48.6		69.7		118.3		22.8		144.7		167.5
Automotive	1.4		66.6		68.0		1.0		49.8		50.8
Electronics	0.2		43.1		43.3		0.2		39.3		39.5
Medical	14.6		17.4		32.0		10.3		19.6		29.9
Construction/Mining	6.1		15.8		21.9		5.0		29.8		34.8
Food Equipment & Appliances	0.1		20.6		20.7		0.1		47.1		47.2
Other	11.0		19.8		30.8		9.0		26.0		35.0
Total	$	300.6	$	315.6	$	616.2	$	300.7	$	469.6	$	770.3

(in millions)	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Global Markets:
Aerospace & Defense	$	398.4	$	137.0	$	535.4	$	611.1	$	247.0	$	858.1
Energy*	79.1		188.3		267.4		46.9		291.2		338.1
Automotive	3.4		156.1		159.5		3.0		124.3		127.3
Electronics	0.5		98.4		98.9		0.5		72.2		72.7
Construction/Mining	11.2		53.2		64.4		10.3		68.1		78.4
Medical	25.8		35.2		61.0		27.3		41.2		68.5
Food Equipment & Appliances	0.1		56.0		56.1		0.1		97.5		97.6
Other	23.0		43.0		66.0		21.8		63.3		85.1
Total	$	541.5	$	767.2	$	1,308.7	$	721.0	$	1,004.8	$	1,725.8

*Includes the oil & gas, downstream processing, and specialty energy markets.

(in millions)	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Primary Geographical Market:
United States	$	157.6	$	172.1	$	329.7	$	166.2	$	311.0	$	477.2
Asia	40.6		94.7		135.3		27.6		91.1		118.7
Europe	86.3		27.1		113.4		92.0		32.4		124.4
Canada	9.3		10.7		20.0		5.1		11.1		16.2
South America, Middle East and other	6.8		11.0		17.8		9.8		24.0		33.8
Total	$	300.6	$	315.6	$	616.2	$	300.7	$	469.6	$	770.3

(in millions)	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Primary Geographical Market:
United States	$	285.9	$	443.7	$	729.6	$	393.5	$	689.8	$	1,083.3
Asia	60.7		217.3		278.0		52.7		185.3		238.0
Europe	165.4		61.1		226.5		225.5		70.0		295.5
Canada	17.5		19.8		37.3		16.7		21.5		38.2
South America, Middle East and other	12.0		25.3		37.3		32.6		38.2		70.8
Total	$	541.5	$	767.2	$	1,308.7	$	721.0	$	1,004.8	$	1,725.8

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 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 conversion service sales in the AA&S segment are excluded from this presentation.

	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Products and Services:
High-Value Products
Nickel-based alloys and specialty alloys	45	%	21	%	33	%	36	%	32	%	34	%
Precision rolled strip products	—	%	39	%	19	%	—	%	20	%	12	%
Precision forgings, castings and components	36	%	—	%	18	%	35	%	—	%	14	%
Titanium and titanium-based alloys	19	%	6	%	13	%	29	%	13	%	19	%
Zirconium and related alloys	—	%	24	%	12	%	—	%	14	%	8	%
Total High-Value Products	100	%	90	%	95	%	100	%	79	%	87	%
Standard Products
Standard stainless products	—	%	10	%	5	%	—	%	21	%	13	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Products and Services:
High-Value Products
Nickel-based alloys and specialty alloys	41	%	25	%	32	%	38	%	28	%	34	%
Precision rolled strip products	—	%	35	%	20	%	—	%	18	%	12	%
Precision forgings, castings and components	39	%	—	%	17	%	35	%	—	%	15	%
Titanium and titanium-based alloys	20	%	6	%	12	%	27	%	10	%	18	%
Zirconium and related alloys	—	%	19	%	10	%	—	%	12	%	8	%
Total High-Value Products	100	%	85	%	91	%	100	%	68	%	87	%
Standard Products
Standard stainless products	—	%	15	%	9	%	—	%	32	%	13	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

The Company maintained a backlog of confirmed orders totaling $1.6 billion and $1.5 billion at June 30, 2021 and 2020, respectively. Due to the structure of the Company’s long-term agreements, approximately 75% of this backlog at June 30, 2021 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 June 30, 2021 and December 31, 2020, accounts receivable with customers were $366.1 million and $350.1 million, respectively. The following represents the rollforward of accounts receivable - reserve for doubtful accounts and contract assets and liabilities for the six months ended June 30, 2021 and 2020:

(in millions)
Accounts Receivable - Reserve for Doubtful Accounts	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	4.3	$	4.6
Expense to increase the reserve	—		0.2
Write-off of uncollectible accounts	(0.4)		(0.3)
Balance as of period end	$	3.9	$	4.5

(in millions)
Contract Assets
Short-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	38.9	$	38.5
Recognized in current year	48.9		37.5
Reclassified to accounts receivable	(30.4)		(34.5)
Impairment	—		—
Reclassification to/from long-term and contract liability	(5.1)		0.1
Balance as of period end	$	52.3	$	41.6
Long-term	June 30, 2021		June 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-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	111.8	$	78.7
Recognized in current year	77.9		97.9
Amounts in beginning balance reclassified to revenue	(63.9)		(33.9)
Current year amounts reclassified to revenue	(18.7)		(38.5)
Other	—		(0.2)
Reclassification to/from long-term and contract asset	(3.3)		5.8
Balance as of period end	$	103.8	$	109.8
Long-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	32.0	$	25.9
Recognized in current year	41.0		12.4
Amounts in beginning balance reclassified to revenue	(0.5)		(0.5)
Current year amounts reclassified to revenue	—		—
Other	—		—
Reclassification to/from short-term	(1.8)		(5.8)
Balance as of period end	$	70.7	$	32.0

Contract costs for obtaining and fulfilling a contract were $5.5 million and $5.4 million as of June 30, 2021 and December 31, 2020, respectively, and are reported in other long-term assets on the consolidated balance sheet. Contract cost amortization expense for the three and six months ended June 30, 2021 was $0.3 million and $0.5 million, respectively. Contract cost amortization expense for the three and six months ended June 30, 2020 was $0.4 million and $0.7 million, respectively.

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Inventories

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories at June 30, 2021 and December 31, 2020 were as follows (in millions):

	June 30, 2021		December 31, 2020
Raw materials and supplies	$	206.3	$	207.6
Work-in-process	782.5		690.7
Finished goods	143.9		181.6
Total inventories at current cost	1,132.7		1,079.9
Adjustment from current cost to LIFO cost basis	29.9		44.1
Inventory valuation reserves	(103.6)		(126.9)
Total inventories, net	$	1,059.0	$	997.1

Inventories are stated at the lower of cost (last-in, first-out (LIFO), first-in, first-out (FIFO), and average cost methods) or market. Most of the Company’s inventory is valued utilizing the LIFO costing methodology. Inventory of the Company’s non-U.S. operations is valued using average cost or FIFO methods. Due to deflationary impacts primarily related to raw materials, the carrying value of the Company’s inventory as valued on LIFO exceeds current replacement cost, and based on a lower of cost or market value analysis, the Company maintains net realizable value (NRV) inventory valuation reserves to adjust the carrying value of LIFO inventory to current replacement cost. These NRV reserves were $29.9 million at June 30, 2021 and $44.1 million at December 31, 2020. Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):

	Six months ended June 30,
	2021		2020
LIFO benefit (charge)	$	(14.1)	$	14.0
NRV benefit (charge)	14.1		(14.0)
Net cost of sales impact	$	—	$	—

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Property Plant And Equipment

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Property Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment at June 30, 2021 and December 31, 2020 was as follows (in millions):

	June 30, 2021		December 31, 2020
Land	$	34.9	$	34.8
Buildings	574.6		564.7
Equipment and leasehold improvements	2,791.8		2,736.9
	3,401.3		3,336.4
Accumulated depreciation and amortization	(1,915.0)		(1,867.2)
Total property, plant and equipment, net	$	1,486.3	$	1,469.2

The construction in progress portion of property, plant and equipment at June 30, 2021 was $244.9 million. Capital expenditures on the consolidated statement of cash flows for the period ended June 30, 2021 exclude $3.4 million of completion payments that were included in property, plant and equipment and accrued at June 30, 2021.

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Joint Ventures

6 Months Ended

Jun. 30, 2021

Equity Method Investments and Joint Ventures [Abstract]

Joint Ventures

Joint VenturesThe financial results of majority-owned joint ventures are consolidated into the Company’s operating results and financial position, with the minority ownership interest recognized in the consolidated statements of operations as net income attributable to noncontrolling interests, and as equity attributable to the noncontrolling interests within total stockholders’ equity. Investments in which the Company exercises significant influence, but which it does not control (generally a 20% to 50% ownership interest), are accounted for under the equity method of accounting.

Majority-Owned Joint Ventures

STAL:

The Company has a 60% interest in the Chinese joint venture known as STAL. The remaining 40% interest in STAL is owned by China Baowu Steel Group Corporation Limited, a state authorized investment company whose equity securities are publicly traded in the People’s Republic of China. STAL is part of ATI’s AA&S segment and manufactures Precision Rolled Strip stainless products mainly for the electronics and automotive markets located in Asia. Cash and cash equivalents held by STAL as of June 30, 2021 were $47.2 million.

Next Gen Alloys LLC:

The Company has a 51% interest in Next Gen Alloys LLC, a joint venture with GE Aviation for the development of a new meltless titanium alloy powder manufacturing technology. The titanium alloy powders are being developed for use in additive manufacturing applications, including 3D printing. Cash and cash equivalents held by this joint venture as of June 30, 2021 were $1.7 million.

Equity Method Joint Ventures

A&T Stainless:

The Company has a 50% interest in A&T Stainless, a joint venture with an affiliate company of Tsingshan Group (Tsingshan) to produce 60-inch wide stainless sheet products for sale in North America. Tsingshan purchased its 50% joint venture interest in A&T Stainless in 2018 for $17.5 million, of which $12.0 million has been received by ATI. The A&T Stainless operations included the Company’s previously-idled direct roll and pickle (DRAP) facility in Midland, PA. ATI provided hot-rolling conversion services to A&T Stainless using the AA&S segment’s Hot-Rolling and Processing Facility. ATI accounts for the A&T Stainless joint venture under the equity method of accounting.

In March 2018, ATI filed for an exclusion from the Section 232 tariffs on behalf of A&T Stainless, which imports semi-finished stainless slab products from Indonesia. In April 2019, the Company learned that this exclusion request was denied by the U.S. Department of Commerce. ATI filed new requests on behalf of A&T Stainless for exclusion from the Section 232 tariffs in October 2019. These requests were denied by the U.S. Department of Commerce in the second quarter of 2020, and the 25% tariff remains in place.

Due to repeated tariff exclusion denials, the DRAP facility was idled in an orderly shut down process that was completed in the third quarter of 2020. ATI’s share of A&T Stainless results were losses of $0.4 million and $0.9 million for the three and six months ended June 30, 2021, respectively, and losses of $4.6 million and $8.5 million for the three and six months ended June 30, 2020, respectively, which is included within other income/expense, net, on the consolidated statements of operations. These equity method results are reported in the AA&S segment, with the exception of ATI’s $2.4 million share of a charge recorded by A&T Stainless for termination benefits during the second quarter ended June 30, 2020.

As of June 30, 2021 and December 31, 2020, ATI had net receivables for working capital advances and administrative services from A&T Stainless of $13.2 million and $14.0 million, respectively. For the June 30, 2021 balance of net receivables, $0.5 million was reported in prepaid expenses and other current assets and $12.7 million in other long-term assets on the consolidated balance sheet, while for December 31, 2020, $0.5 million was reported in prepaid expenses and other current assets and $13.5 million in other long-term assets. In addition, ATI evaluated the collectability of its remaining $5.5 million receivable from Tsingshan, which is reported in other long-term assets on the consolidated balance sheet, and concluded that no impairment or loss in expected value exists at this time.

Uniti:

ATI has a 50% interest in the industrial titanium joint venture known as Uniti, with the remaining 50% interest held by VSMPO, a Russian producer of titanium, aluminum, and specialty steel products. Uniti is accounted for under the equity method of accounting. ATI’s share of Uniti’s income was $0.4 million and $0.9 million for the three and six months ended June 30, 2021, respectively, and $0.3 million and $0.5 million for the three and six months ended June 30, 2020, respectively, which is included in the AA&S segment’s operating results, and within other income/expense, net on the consolidated statements of operations.

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Supplemental Financial Statement Information - (Notes)

6 Months Ended

Jun. 30, 2021

Other Income and Expenses [Abstract]

Supplemental Financial Statement Information

Supplemental Financial Statement Information

Other income (expense), net for the three and six months ended June 30, 2021 and 2020 was as follows:

(in millions)	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Rent and royalty income	$	0.2	$	0.2	$	0.5	$	0.5
Gains from disposal of property, plant and equipment, net	1.2		—		2.4		2.5
Net equity loss on joint ventures (See Note 5)	—		(1.9)		—		(5.6)
Joint venture restructuring charges (See Note 5)	—		(2.4)		—		(2.4)
Adjustment to indemnification for conditional ARO costs	—		4.3		—		4.3
Other	—		0.3		—		0.3
Total other income (expense), net	$	1.4	$	0.5	$	2.9	$	(0.4)

Gains from disposal of property, plant and equipment, net for the six months ended June 30, 2020 included a $2.5 million gain on the sale of certain oil and gas rights. This cash gain was reported as an investing activity on the consolidated statement of cash flows for the six months ended June 30, 2020 and is excluded from segment operating results.

In the second quarter of 2020, the Company finalized a settlement agreement for an indemnity claim concerning a conditional asset retirement obligation (ARO) with the buyer of a formerly-owned business and as a result, the Company reduced ARO reserves by $4.3 million.

Restructuring

Restructuring charges for the second quarter and six months ended June 30, 2021 were a net credit of $6.2 million, primarily related to $6.9 million for lowered severance-related reserves for approximately 200 employees based on changes in planned operating rates and revised workforce reduction estimates. This was offset by $0.7 million of other costs related to facility idlings.

For the second quarter and six months ended June 30, 2020, the Company recorded restructuring charges of $16.7 million and $24.7 million, respectively, which are presented as restructuring charges in the consolidated statements of operations. These charges were a result of workforce right-sizing actions to better match the Company’s cost structure to expected demand, primarily as a result of economic challenges created by the COVID-19 pandemic. For the second quarter of 2020, these charges are comprised of severance obligations for the elimination of approximately 550 positions for both involuntary reductions and voluntary retirement incentive programs related to both salary and hourly employees in the HPMC segment. For the six months ended June 30, 2020, these charges also include severance obligations for the reduction of approximately 90 positions for a voluntary retirement incentive program completed in the first quarter of 2020 for eligible salaried employees.

Restructuring reserves for severance cost activity is as follows:

	Severance and Employee
	Benefit Costs
Balance at December 31, 2020	$	43.4
Adjustments	(6.9)
Payments	(10.2)
Balance at June 30, 2021	$	26.3

The $26.3 million restructuring reserve balance at June 30, 2021 includes $18.2 million recorded in other current liabilities and $8.1 million recorded in other long-term liabilities on the consolidated balance sheet.

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Debt

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Debt

Debt

Debt at June 30, 2021 and December 31, 2020 was as follows (in millions): 

	June 30, 2021		December 31, 2020
Allegheny Technologies 5.875% Notes due 2023 (a)	$	500.0	$	500.0
Allegheny Technologies 5.875% Notes due 2027	350.0		350.0
Allegheny Technologies 3.5% Convertible Senior Notes due 2025	291.4		291.4
Allegheny Technologies 4.75% Convertible Senior Notes due 2022	84.2		84.2
Allegheny Ludlum 6.95% Debentures due 2025 (b)	150.0		150.0
Term Loan due 2024	200.0		200.0
U.S. revolving credit facility	—		—
Foreign credit facilities	4.6		5.5
Finance leases and other	55.5		48.0
Debt issuance costs	(14.2)		(14.5)
Equity component of convertible debt	—		(46.8)
Total debt	1,621.5		1,567.8
Short-term debt and current portion of long-term debt	19.3		17.8
Total long-term debt	$	1,602.2	$	1,550.0

(a) Bearing interest at 7.875% effective February 15, 2016.

(b) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed

by ATI.

Revolving Credit Facility

The Company has an Asset Based Lending (ABL) Credit Facility, which is collateralized by the accounts receivable and inventory of the Company’s domestic operations. The ABL facility, which matures in September 2024, includes a $500 million revolving credit facility, a letter of credit sub-facility of up to $200 million, and a $200 million term loan (Term Loan). The Term Loan has an interest rate of 2.0% plus a LIBOR spread and can be prepaid in increments of $25 million if certain minimum liquidity conditions are satisfied. In addition, the Company has the right to request an increase of up to $200 million in the maximum amount available under the revolving credit facility for the duration of the ABL. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed interest rate. The swap matures in June 2024.

The applicable interest rate for revolving credit borrowings under the ABL facility includes interest rate spreads based on available borrowing capacity that range between 1.25% and 1.75% for LIBOR-based borrowings and between 0.25% and 0.75% for base rate borrowings. The ABL facility contains a financial covenant whereby the Company must maintain a fixed charge coverage ratio of not less than 1.00:1.00 after an event of default has occurred and is continuing or if the undrawn availability under the ABL revolving credit portion of the facility is less than the greater of (i) $87.5 million, calculated as 12.5% of the then applicable maximum advance amount under the revolving credit portion of the ABL and the outstanding Term Loan balance, or (ii) $62.5 million. The Company does not meet this fixed charge coverage ratio at June 30, 2021. As a result, the Company is unable to access 12.5%, or $87.5 million, of the ABL facility until it meets the ratio. Additionally, the Company must demonstrate minimum liquidity, as calculated in accordance with the terms of the ABL facility, during the 90-day period immediately preceding the stated maturity date of the 4.75% Convertible Notes due 2022 and the 5.875% Notes due 2023. The ABL also contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Company’s ability to incur additional indebtedness or liens or to enter into investments, mergers and acquisitions, dispositions of assets and transactions with affiliates, some of which are more restrictive, at any time during the term of the ABL when the Company’s fixed charge coverage ratio is less than 1.00:1.00 and its undrawn availability under the revolving portion of the ABL is less than the greater of (a) $150 million or (b) 30% of the sum of the maximum advance amount under the revolving credit portion of the ABL and the outstanding Term Loan balance.

As of June 30, 2021, there were no outstanding borrowings under the revolving portion of the ABL facility, and $42.8 million was utilized to support the issuance of letters of credit. There were no average revolving credit borrowings under the ABL facility for the first six months of 2021. There were average revolving credit borrowings of $58 million bearing an average annual interest rate of 2.2% under the ABL facility for the first six months of 2020.

2025 Convertible Notes

In 2020, the Company issued $291.4 million aggregate principal amount of 2025 Convertible Notes. The Company used a portion of the net proceeds from the offering of the 2025 Convertible Notes to repurchase $203.2 million aggregate principal amount of its outstanding 2022 Convertible Notes, resulting in a $21.5 million debt extinguishment charge. The Company also used the net proceeds of the offering of the 2025 Convertible Notes to pay the cost of capped call transactions, described below, which was recorded as a reduction to additional paid-in-capital in stockholders’ equity on the consolidated balance sheet. The remainder of the net proceeds from the offering is being used for general corporate purposes.

The 2025 Convertible Notes have a 3.5% cash coupon rate that is payable semi-annually in arrears on each June 15 and December 15. Including amortization of deferred issuance costs, the effective interest rate is 4.2% for the first six months ended June 30, 2021. Remaining deferred issuance costs were $7.4 million and $8.2 million at June 30, 2021 and December 31, 2020, respectively. Interest expense on the 2025 Convertible Notes was as follows:

	Three months ended June 30,		Six months ended June 30,
(in millions)	2021		2021
Contractual coupon rate	$	2.5	$	5.1
Amortization of debt issuance costs	0.4		0.8
Total interest expense	$	2.9	$	5.9

The Company does not have the right to redeem the 2025 Convertible Notes prior to June 15, 2023. On or after June 15, 2023 and prior to the 41st scheduled trading day immediately preceding the maturity date, the Company may redeem all or any portion of the 2025 Convertible Notes, at its option, at a redemption price equal to 100% of the principal amount thereof, plus any accrued and unpaid interest, if the last reported sale price of ATI’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on the trading day immediately preceding the date on which ATI provides written notice of redemption.

The initial conversion rate for the 2025 Convertible Notes is 64.5745 shares of ATI common stock per $1,000 principal amount of the 2025 Convertible Notes, equivalent to an initial conversion price of approximately $15.49 per share (18.8 million shares). Prior to the close of business on the business day immediately preceding March 15, 2025, the 2025 Convertible Notes will be convertible at the option of the holders of 2025 Convertible Notes only upon the satisfaction of specified conditions and during certain periods. Thereafter, until the close of business on the second scheduled trading day immediately preceding the maturity date, the 2025 Convertible Notes will be convertible at the option of holders of 2025 Convertible Notes at any time regardless of these conditions. Conversions of the 2025 Convertible Notes may be settled in cash, shares of ATI’s common stock or a combination thereof, at ATI’s election.

As a result of this flexible settlement feature of the 2025 Convertible Notes, the embedded conversion option was required to be separately accounted for as a component of stockholders’ equity. The value of the embedded conversion option was determined to be $51.4 million based on the estimated fair value of comparable senior unsecured debt without the conversion feature, using an income approach of expected present value. During the 2020 fiscal year, the equity component was amortized as additional non-cash interest expense, commonly referred to as phantom yield, over the term of the 2025 Convertible Notes using the effective interest method. As a result, as of December 31, 2020, $49.8 million of the 2025 Convertible Notes was recorded in additional paid-in-capital in stockholders’ equity ($51.4 million of the gross $291.4 million, net of $1.6 million of allocated offering costs). Due to the non-cash phantom yield and including debt issue cost amortization, the 2025 Convertible Notes had reported interest expense in 2020 at an 8.4% rate, higher than the 3.5% cash coupon rate. Effective January 1, 2021, ATI early-adopted new accounting guidance as discussed in Note 1 that eliminated the equity component classification of the embedded conversion option, as well as the phantom yield portion of interest expense on a prospective basis. Upon adoption on January 1, 2021, long-term debt increased by $45.4 million, representing the $46.8 million equity component of convertible debt as of December 31, 2020 in the above table, net of reclassified debt issue costs.

ATI entered into privately negotiated capped call transactions with certain of the initial purchasers of the 2025 Convertible Notes or their respective affiliates (collectively, the Counterparties). The capped call transactions are expected generally to reduce potential dilution to ATI’s common stock upon any conversion of the 2025 Convertible Notes and/or offset any cash payments ATI is required to make in excess of the principal amount of converted 2025 Convertible Notes, as the case may be, with such reduction and/or offset subject to a cap based on the cap price. The cap price of the capped call transactions initially is approximately $19.76 per share, and is subject to adjustments under the terms of the capped call transactions.

2022 Convertible Notes

As of June 30, 2021, the Company had $84.2 million aggregate principal amount of the 2022 Convertible Notes outstanding, which mature on July 1, 2022. Interest on the 2022 Convertible Notes at the 4.75% cash coupon rate is payable semi-annually in arrears on each January 1 and July 1. Including amortization of deferred issuance costs, the effective interest rate is 5.4% for the six months ended June 30, 2021 and 2020. Remaining deferred issuance costs were $0.5 million and $0.7 million at June 30, 2021 and December 31, 2020, respectively. Interest expense on the 2022 Convertible Notes was as follows:

	Three months ended June 30,				Six months ended June 30,
(in millions)	2021		2020		2021		2020
Contractual coupon rate	$	1.0	$	3.2	$	2.0	$	6.6
Amortization of debt issuance costs	0.1		0.4		0.2		0.8
Total interest expense	$	1.1	$	3.6	$	2.2	$	7.4

The Company does not have the right to redeem the 2022 Convertible Notes prior to their stated maturity date. Holders of the 2022 Convertible Notes have the option to convert their notes into shares of the Company’s common stock, at any time prior to the close of business on the business day immediately preceding the stated maturity date (July 1, 2022). The initial conversion rate for the remaining $84.2 million of 2022 Convertible Notes is 69.2042 shares of ATI common stock per $1,000 (in whole dollars) principal amount of Notes (5.8 million shares), equivalent to a conversion price of $14.45 per share, subject to adjustment in certain events. Other than receiving cash in lieu of fractional shares, holders do not have the option to receive cash instead of shares of common stock upon conversion. Accrued and unpaid interest that exists upon conversion of a note will be deemed paid by the delivery of shares of ATI common stock and no cash payment or additional shares will be given to the holders.

If the Company undergoes a fundamental change as defined in the agreement, holders of the 2022 Convertible Notes may require the Company to repurchase the notes in whole or in part for cash at a price equal to 100% of the principal amount of the notes to be purchased plus any accrued and unpaid interest to, but excluding, the repurchase date.

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Derivative Financial Instruments and Hedging

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments and Hedging

Derivative Financial Instruments and Hedging

As part of its risk management strategy, the Company, from time-to-time, utilizes derivative financial instruments to manage its exposure to changes in raw material prices, energy costs, foreign currencies, and interest rates. In accordance with applicable accounting standards, the Company accounts for most of these contracts as hedges.

The Company sometimes uses futures and swap contracts to manage exposure to changes in prices for forecasted purchases of raw materials, such as nickel, and natural gas. Under these contracts, which are generally accounted for as cash flow hedges, the price of the item being hedged is fixed at the time that the contract is entered into, and the Company is obligated to make or receive a payment equal to the net change between this fixed price and the market price at the date the contract matures.

The majority of ATI’s products are sold utilizing raw material surcharges and index mechanisms. However, as of June 30, 2021, the Company had entered into financial hedging arrangements, primarily at the request of its customers, related to firm orders, for an aggregate notional amount of approximately 5 million pounds of nickel with hedge dates through 2023. The aggregate notional amount hedged is approximately 10% of a single year’s estimated nickel raw material purchase requirements.

At June 30, 2021, the outstanding financial derivatives used to hedge the Company’s exposure to energy cost volatility included natural gas cost hedges. At June 30, 2021, the Company hedged approximately 70% of its forecasted domestic requirements for natural gas for the remainder of 2021 and approximately 25% for 2022.

While the majority of the Company’s direct export sales are transacted in U.S. dollars, foreign currency exchange contracts are used, from time-to-time, to limit transactional exposure to changes in currency exchange rates for those transactions denominated in a non-U.S. currency. The Company sometimes purchases foreign currency forward contracts that permit it to sell specified amounts of foreign currencies expected to be received from its export sales for pre-established U.S. dollar amounts at specified dates. The forward contracts are denominated in the same foreign currencies in which export sales are denominated. These contracts are designated as hedges of the variability in cash flows of a portion of the forecasted future export sales transactions which otherwise would expose the Company to foreign currency risk, primarily euro. In addition, the Company may also hedge forecasted capital expenditures and designate cash balances held in foreign currencies as hedges of forecasted foreign currency transactions. At June 30, 2021, the Company had no significant outstanding foreign currency forward contracts.

The Company may enter into derivative interest rate contracts to maintain a reasonable balance between fixed- and floating-rate debt. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed rate. The swap matures in June 2024. The Company designated the interest rate swap as a cash flow hedge of the Company’s exposure to the variability of the payment of interest on a portion of its Term Loan borrowings. The ineffectiveness at hedge inception, determined from the fair value of the swap immediately prior to its July 2019 amendment, was amortized to interest expense over the initial Term Loan swap maturity date of January 12, 2021.

There are no credit risk-related contingent features in the Company’s derivative contracts, and the contracts contained no provisions under which the Company has posted, or would be required to post, collateral. The counterparties to the Company’s derivative contracts are substantial and creditworthy commercial banks that are recognized market makers. The Company controls its credit exposure by diversifying across multiple counterparties and by monitoring credit ratings and credit default swap spreads of its counterparties. The Company also enters into master netting agreements with counterparties when possible.

The fair values of the Company’s derivative financial instruments are presented below, representing the gross amounts recognized which are not offset by counterparty or by type of item hedged. All fair values for these derivatives were measured using Level 2 information as defined by the accounting standard hierarchy, which includes quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs derived principally from or corroborated by observable market data.

(In millions) Asset derivatives	Balance sheet location	June 30, 2021		December 31, 2020
Derivatives designated as hedging instruments:
Nickel and other raw material contracts	Prepaid expenses and other current assets	$	3.8	$	3.7
Natural gas contracts	Prepaid expenses and other current assets	2.6		0.2
Nickel and other raw material contracts	Other assets	0.8		0.7
Natural gas contracts	Other assets	0.4		0.2
Total derivatives designated as hedging instruments		$	7.6	$	4.8
Liability derivatives	Balance sheet location
Derivatives designated as hedging instruments:
Interest rate swap	Other current liabilities	$	1.0	$	1.0
Natural gas contracts	Other current liabilities	—		0.3
Nickel and other raw material contracts	Other current liabilities	—		0.1
Interest rate swap	Other long-term liabilities	1.6		2.5
Natural gas contracts	Other long-term liabilities	—		0.1
Total derivatives designated as hedging instruments		$	2.6	$	4.0

For derivative financial instruments that are designated as cash flow hedges, the gain or loss on the derivative is reported as a component of other comprehensive income (OCI) and reclassified into earnings in the same period or periods during which the hedged item affects earnings. For derivative financial instruments that are designated as fair value hedges, changes in the fair value of these derivatives are recognized in current period results and are reported as changes within accrued liabilities and other on the consolidated statements of cash flows. There were no outstanding fair value hedges as of June 30, 2021. The Company did not use net investment hedges for the periods presented. The effects of derivative instruments in the tables below are presented net of related income taxes, excluding any impacts of changes to income tax valuation allowances affecting results of operations or other comprehensive income, when applicable (see Note 14 for further explanation).

Assuming market prices remain constant with those at June 30, 2021, a pre-tax gain of $5.4 million is expected to be recognized over the next 12 months.

Activity with regard to derivatives designated as cash flow hedges for the three and six month periods ended June 30, 2021 and 2020 was as follows (in millions): 

	Amount of Gain (Loss) Recognized in OCI on Derivatives				Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (a)
	Three months ended June 30,				Three months ended June 30,
Derivatives in Cash Flow Hedging Relationships	2021		2020		2021		2020
Nickel and other raw material contracts	$	3.4	$	2.0	$	1.1	$	(1.8)
Natural gas contracts	2.0		(0.1)		0.2		(1.0)
Foreign exchange contracts	—		—		—		(0.1)
Interest rate swap	(0.3)		(0.3)		(0.2)		(0.3)
Total	$	5.1	$	1.6	$	1.1	$	(3.2)

	Amount of Gain (Loss) Recognized in OCI on Derivatives				Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (a)
	Six months ended June 30,				Six months ended June 30,
Derivatives in Cash Flow Hedging Relationships	2021		2020		2021		2020
Nickel and other raw material contracts	$	2.8	$	(4.2)	$	2.6	$	(2.0)
Natural gas contracts	2.4		(1.3)		0.2		(2.0)
Foreign exchange contracts	0.1		(0.1)		—		(0.1)
Interest rate swap	0.1		(2.2)		(0.4)		(0.5)
Total	$	5.4	$	(7.8)	$	2.4	$	(4.6)

(a)The gains (losses) reclassified from accumulated OCI into income related to the derivatives, with the exception of the interest rate swap, are presented in cost of sales in the same period or periods in which the hedged item affects earnings. The gains (losses) reclassified from accumulated OCI into income on the interest rate swap are presented in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings.

The disclosures of gains or losses presented above for nickel and other raw material contracts and foreign currency contracts do not take into account the anticipated underlying transactions. Since these derivative contracts represent hedges, the net effect of any gain or loss on results of operations may be fully or partially offset.

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Fair Value Of Financial Instruments

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

The estimated fair value of financial instruments at June 30, 2021 was as follows: 

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	472.5	$	472.5	$	472.5	$	—
Derivative financial instruments:
Assets	7.6		7.6		—		7.6
Liabilities	2.6		2.6		—		2.6
Debt (a)	1,635.7		1,930.0		1,669.9		260.1

The estimated fair value of financial instruments at December 31, 2020 was as follows: 

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	645.9	$	645.9	$	645.9	$	—
Derivative financial instruments:
Assets	4.8		4.8		—		4.8
Liabilities	4.0		4.0		—		4.0
Debt (a)	1,629.1		1,847.7		1,594.2		253.5

(a)The total carrying amount for debt for both periods excludes debt issuance costs related to the recognized debt liability which is presented in the consolidated balance sheet as a direct reduction from the carrying amount of the debt liability. The December 31, 2020 debt carrying value includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes. Effective January 1, 2021, ATI early-adopted new accounting guidance that eliminated the equity component classification of the embedded conversion option of the 2025 Convertible Notes (see Note 1).

In accordance with accounting standards, fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. Accounting standards established three levels of a fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

Level 1 – Quoted prices in active markets for identical assets or liabilities.

Level 2 – Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

The availability of observable market data is monitored to assess the appropriate classification of financial instruments within the fair value hierarchy. Changes in economic conditions or model-based valuation techniques may require the transfer of financial instruments from one fair value level to another. In such instances, the transfer is reported at the beginning of the reporting period.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents: Fair value was determined using Level 1 information.

Derivative financial instruments: Fair values for derivatives were measured using exchange-traded prices for the hedged items. The fair value was determined using Level 2 information, including consideration of counterparty risk and the Company’s credit risk.

Short-term and long-term debt: The fair values of the Company’s publicly traded debt were based on Level 1 information. The fair values of the other short-term and long-term debt were determined using Level 2 information.

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Retirement Benefits

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Retirement Benefits

Retirement BenefitsThe Company has defined contribution retirement plans or defined benefit pension plans covering substantially all employees. Company contributions to defined contribution retirement plans are generally based on a percentage of eligible pay or based on hours worked. Benefits under the defined benefit pension plans are generally based on years of service and/or final average pay. The Company funds the U.S. pension plans in accordance with the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code of 1986, as amended (IRC). The Company also sponsors several postretirement plans covering certain collectively-bargained salaried and hourly employees. The plans provide health care and life insurance benefits for eligible retirees. In most retiree health care plans, Company contributions towards premiums are capped based on

the cost as of a certain date, thereby creating a defined contribution. All defined benefit pension and retiree health care plans are closed to new entrants.

For the three month periods ended June 30, 2021 and 2020, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 

	Pension Benefits				Other Postretirement Benefits
	Three months ended June 30,				Three months ended June 30,
	2021		2020		2021		2020
Service cost - benefits earned during the year	$	3.7	$	3.1	$	0.4	$	0.6
Interest cost on benefits earned in prior years	17.1		21.6		2.1		2.7
Expected return on plan assets	(34.1)		(33.6)		—		—
Amortization of prior service cost (credit)	0.1		0.2		(0.6)		(1.0)
Amortization of net actuarial loss	18.9		18.6		3.3		2.7
Total retirement benefit expense	$	5.7	$	9.9	$	5.2	$	5.0

For the six month periods ended June 30, 2021 and 2020, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions):

	Pension Benefits				Other Postretirement Benefits
	Six months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Service cost - benefits earned during the year	$	7.5	$	6.3	$	0.7	$	1.1
Interest cost on benefits earned in prior years	34.2		43.1		4.2		5.4
Expected return on plan assets	(68.2)		(67.2)		—		—
Amortization of prior service cost (credit)	0.3		0.4		(1.3)		(1.9)
Amortization of net actuarial loss	37.8		37.2		6.6		5.4
Total retirement benefit expense	$	11.6	$	19.8	$	10.2	$	10.0

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Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesThe provision for income taxes for the second quarter and six months ended June 30, 2021 was $4.0 million and $9.5 million, respectively. The tax provision for the second quarter and six months ended June 30, 2020 was $92.6 million, or (28.3)%, and $103.4 million, or (35.3)%, respectively, of loss before taxes, based on the actual year to date effective rate for this period. In the second quarter 2020, the Company entered into a three-year cumulative loss within the United States, limiting the Company’s ability to utilize future projections when analyzing the need for a valuation allowance, therefore limiting sources of income as part of the analysis. As a result, ATI recorded a $99.0 million deferred tax asset valuation allowance on its U.S. federal and state tax attributes in the second quarter of 2020. ATI continues to maintain valuation allowances on its U.S. federal and state deferred tax assets, as well as for certain foreign jurisdictions. Throughout 2020, the Company calculated the provision for income taxes based upon actual year to date results due to the uncertainty of future projections as a result of the global pandemic. For 2021, the Company continues to be unable to make a reliable estimate of the annual effective tax rate, as significant changes in projected results for the Company’s U.S. operations could produce a significant variation in its annual effective tax rate. As a result, the Company recorded income tax for the six months ended June 30, 2021 based upon an annual effective tax rate for its foreign, non-valuation allowance operations, combined with actual year-to-date tax expense related to its U.S. jurisdictions. The current year tax expense is mainly attributable to the Company’s foreign operations.

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Business Segments

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Business Segments

Business Segments

The Company operates in two business segments: High Performance Materials & Components (HPMC) and Advanced Alloys & Solutions (AA&S). In the fourth quarter 2020, the Company changed its segment performance measure from segment operating profit to segment EBITDA, based on internal reporting changes. Prior period results are presented using the new performance measure. The measure of segment EBITDA excludes all effects of LIFO inventory accounting and any related changes in net realizable value inventory reserves which offset the Company’s aggregate net debit LIFO valuation balance, income taxes, depreciation and amortization, corporate expenses, net interest expense, closed operations and other income (expense), charges for goodwill and asset impairments, restructuring and other credits/charges, strike related costs, debt extinguishment charges and non-operating gains or losses. Management believes segment EBITDA, as defined, provides an appropriate measure of controllable operating results at the business segment level. Following is certain financial information with respect to the Company’s business segments for the periods indicated (in millions):

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Total sales:
High Performance Materials & Components	$	318.7	$	316.7	$	583.9	$	765.2
Advanced Alloys & Solutions	339.4		506.2		815.4		1,093.8
	658.1		822.9		1,399.3		1,859.0
Intersegment sales:
High Performance Materials & Components	18.1		16.0		42.4		44.2
Advanced Alloys & Solutions	23.8		36.6		48.2		89.0
	41.9		52.6		90.6		133.2
Sales to external customers:
High Performance Materials & Components	300.6		300.7		541.5		721.0
Advanced Alloys & Solutions	315.6		469.6		767.2		1,004.8
	$	616.2	$	770.3	$	1,308.7	$	1,725.8

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
EBITDA:
High Performance Materials & Components	$	37.2	$	28.7	$	61.8	$	105.3
Advanced Alloys & Solutions	36.0		33.4		85.7		74.5
Total segment EBITDA	73.2		62.1		147.5		179.8
LIFO and net realizable value reserves	—		—		—		—
Corporate expenses	(15.9)		(7.2)		(28.1)		(19.5)
Closed operations and other income (expense)	(3.6)		2.7		(3.1)		(3.6)
Total ATI Adjusted EBITDA	53.7		57.6		116.3		156.7
Depreciation & amortization (a)	(36.3)		(35.6)		(72.4)		(72.9)
Interest expense, net	(23.7)		(21.7)		(47.1)		(43.6)
Restructuring and other credits (charges) (See Note 6)	6.2		(16.7)		6.2		(24.7)
Strike related costs	(40.3)		—		(40.3)		—
Impairment of goodwill	—		(287.0)		—		(287.0)
Joint venture restructuring charge (See Note 5)	—		(2.4)		—		(2.4)
Debt extinguishment charge (See Note 7)	—		(21.5)		—		(21.5)
Gain on asset sales	—		—		—		2.5
Loss before income taxes	$	(40.4)	$	(327.3)	$	(37.3)	$	(292.9)

(a) The following is depreciation & amortization by each business segment:

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
High Performance Materials & Components	$	19.2	$	19.5	$	38.8	$	39.0
Advanced Alloys & Solutions	16.1		15.3		31.6		32.3
Other	1.0		0.8		2.0		1.6
	$	36.3	$	35.6	72.4		72.9

Corporate expenses in the second quarter and first six months of 2021 reflect higher incentive compensation costs compared to the prior year periods, which also included reversals of previously-recognized expense due to COVID-19 pandemic impacts.

Closed operations and other income for the second quarter and six months of 2020 included benefits from settlements of contract indemnity obligations. Closed operations and other expense in the first six months of 2021 compared to 2020 also reflect lower costs at closed facilities, including retirement benefit expense, insurance costs, and real estate and other facility costs, and changes in foreign currency remeasurement impacts primarily related to ATI’s European Treasury operation.

During the second quarter of 2021, the Company recorded $40.3 million in strike related costs, of which $38.2 million were excluded from AA&S segment EBITDA and $2.1 million were excluded from HPMC segment EBITDA. These items primarily consisted of overhead costs recognized in the period due to below-normal operating rates, higher costs for outside conversion activities, and ongoing benefit costs for striking employees. See Note 16 for further information.

During the second quarter of 2020, the Company recorded a $287.0 million goodwill impairment charge for the partial impairment of the Forged Products reporting unit goodwill in the HPMC segment. This goodwill impairment charge was excluded from 2020 HPMC business segment EBITDA.

The $2.5 million gain on asset sales for the first six months of 2020 consists of a gain on the sale of certain oil and gas rights (see Note 6).

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Per Share Information

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Per Share Information

Per Share Information

The following table sets forth the computation of basic and diluted loss per common share: 

(In millions, except per share amounts)	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Numerator:
Numerator for basic loss per common share –
Net loss attributable to ATI	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022	—		—		—		—
3.5% Convertible Senior Notes due 2025	—		—		—		—
Numerator for diluted loss per common share –
Net loss attributable to ATI after assumed conversions	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Denominator:
Denominator for basic net loss per common share – weighted average shares	127.1		126.6		127.0		126.4
Effect of dilutive securities:
Share-based compensation	—		—		—		—
4.75% Convertible Senior Notes due 2022	—		—		—		—
3.5% Convertible Senior Notes due 2025	—		—		—		—
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions	127.1		126.6		127.0		126.4
Basic net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)
Diluted net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)

Common stock that would be issuable upon the assumed conversion of the 2022 Convertible Notes and the 2025 Convertible Notes and other option equivalents and contingently issuable shares are excluded from the computation of contingently issuable shares, and therefore, from the denominator for diluted earnings per share, if the effect of inclusion is anti-dilutive. There were 25.7 million anti-dilutive shares for the three and six months ended June 30, 2021, and 20.5 million and 20.4 million anti-dilutive shares for the three and six months ended June 30, 2020, respectively.

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Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The changes in AOCI by component, net of tax, for the three month period ended June 30, 2021 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, March 31, 2021	$	(1,103.4)	$	(60.9)	$	1.1	$	(45.4)	$	(1,208.6)
OCI before reclassifications		—		5.1		5.1		—	10.2
Amounts reclassified from AOCI	(a)	16.5	(b)	—	(c)	(1.1)	(d)	6.7	22.1
Net current-period OCI		16.5		5.1		4.0		6.7	32.3
Balance, June 30, 2021	$	(1,086.9)	$	(55.8)	$	5.1	$	(38.7)	$	(1,176.3)
Attributable to noncontrolling interests:
Balance, March 31, 2021	$	—	$	21.8	$	—	$	—	$	21.8
OCI before reclassifications		—		1.9		—		—	1.9
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		1.9		—		—	1.9
Balance, June 30, 2021	$	—	$	23.7	$	—	$	—	$	23.7

The changes in AOCI by component, net of tax, for the six month period ended June 30, 2021 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, December 31, 2020	$	(1,119.9)	$	(55.5)	$	2.1	$	(50.3)	$	(1,223.6)
OCI before reclassifications		—		(0.3)		5.4		—	5.1
Amounts reclassified from AOCI	(a)	33.0	(b)	—	(c)	(2.4)	(d)	11.6	42.2
Net current-period OCI		33.0		(0.3)		3.0		11.6	47.3
Balance, June 30, 2021	$	(1,086.9)	$	(55.8)	$	5.1	$	(38.7)	$	(1,176.3)
Attributable to noncontrolling interests:
Balance, December 31, 2020	$	—	$	21.2	$	—	$	—	$	21.2
OCI before reclassifications		—		2.5		—		—	2.5
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		2.5		—		—	2.5
Balance, June 30, 2021	$	—	$	23.7	$	—	$	—	$	23.7

(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

(b)No amounts were reclassified to earnings.

(c)Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

(d)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

The changes in AOCI by component, net of tax, for the three month period ended June 30, 2020 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, March 31, 2020	$	(1,067.4)	$	(99.2)	$	(8.5)	$	(41.5)	$	(1,216.6)
OCI before reclassifications		—		14.7		1.6		—	16.3
Amounts reclassified from AOCI	(a)	15.6	(b)	—	(c)	3.2	(d)	8.7	27.5
Net current-period OCI		15.6		14.7		4.8		8.7	43.8
Balance, June 30, 2020	$	(1,051.8)	$	(84.5)	$	(3.7)	$	(32.8)	$	(1,172.8)
Attributable to noncontrolling interests:
Balance, March 31, 2020	$	—	$	9.0	$	—	$	—	$	9.0
OCI before reclassifications		—		(0.5)		—		—	(0.5)
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		(0.5)		—		—	$	(0.5)
Balance, June 30, 2020	$	—	$	8.5	$	—	$	—	$	8.5

The changes in AOCI by component, net of tax, for the six month period ended June 30, 2020 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, December 31, 2019	$	(1,083.1)	$	(76.6)	$	(0.5)	$	(41.5)	$	(1,201.7)
OCI before reclassifications		—		(7.9)		(7.8)		—	(15.7)
Amounts reclassified from AOCI	(a)	31.3	(b)	—	(c)	4.6	(d)	8.7	44.6
Net current-period OCI		31.3		(7.9)		(3.2)		8.7	28.9
Balance, June 30, 2020	$	(1,051.8)	$	(84.5)	$	(3.7)	$	(32.8)	$	(1,172.8)
Attributable to noncontrolling interests:
Balance, December 31, 2019	$	—	$	9.8	$	—	$	—	$	9.8
OCI before reclassifications		—		(1.3)		—		—	(1.3)
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		(1.3)		—		—	$	(1.3)
Balance, June 30, 2020	$	—	$	8.5	$	—	$	—	$	8.5

(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

(b)No amounts were reclassified to earnings.

(c)Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

(d)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

Other comprehensive income (loss) amounts (OCI) reported above by category are net of applicable income tax expense (benefit) for each year presented. Income tax expense (benefit) on OCI items is recorded as a change in a deferred tax asset or liability. Amounts recognized in OCI include the impact of any deferred tax asset valuation allowances, when applicable. Foreign currency translation adjustments, including those pertaining to noncontrolling interests, are generally not adjusted for income taxes as they relate to indefinite investments in non-U.S. subsidiaries.

Reclassifications out of AOCI for the three and six month periods ended June 30, 2021 and 2020 were as follows: 

	Amounts reclassified to AOCI
Details about AOCI Components (In millions)	Three months ended June 30, 2021		Three months ended June 30, 2020		Six months ended June 30, 2021		Six months ended June 30, 2020			Affected line item in the statements of operations
Postretirement benefit plans
Prior service credit	$	0.5	$	0.8	$	1.0	$	1.5	(a)
Actuarial losses	(22.2)		(21.3)		(44.4)		(42.6)		(a)
	(21.7)		(20.5)		(43.4)		(41.1)		(c)	Total before tax
	(5.2)		(4.9)		(10.4)		(9.8)			Tax benefit (d)
	$	(16.5)	$	(15.6)	$	(33.0)	$	(31.3)		Net of tax
Derivatives
Nickel and other raw material contracts	$	1.4	$	(2.3)	$	3.4	$	(2.6)	(b)
Natural gas contracts	0.3		(1.3)		0.3		(2.6)		(b)
Foreign exchange contracts	—		(0.1)		—		(0.1)		(b)
Interest rate swap	(0.2)		(0.5)		(0.5)		(0.7)		(b)
	1.5		(4.2)		3.2		(6.0)		(c)	Total before tax
	0.4		(1.0)		0.8		(1.4)			Tax expense (benefit) (d)
	$	1.1	$	(3.2)	$	2.4	$	(4.6)		Net of tax

(a)Amounts are reported in nonoperating retirement benefit expense (see Note 10).

(b)Amounts related to derivatives, with the exception of the interest rate swap, are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the interest rate swap are included in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings (see Note 8).

(c)For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.

(d)These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

The Company is subject to various domestic and international environmental laws and regulations that govern the discharge of pollutants and disposal of wastes, and which may require that it investigate and remediate the effects of the release or disposal of materials at sites associated with past and present operations. The Company could incur substantial cleanup costs, fines, and civil or criminal sanctions, third party property damage or personal injury claims as a result of violations or liabilities under these laws or noncompliance with environmental permits required at its facilities. The Company is currently involved in the investigation and remediation of a number of its current and former sites, as well as third party sites.

Environmental liabilities are recorded when the Company’s liability is probable and the costs are reasonably estimable. In many cases, however, the Company is not able to determine whether it is liable or, if liability is probable, to reasonably estimate the loss or range of loss. Estimates of the Company’s liability remain subject to additional uncertainties, including the nature and extent of site contamination, available remediation alternatives, the extent of corrective actions that may be required, and the number, participation, and financial condition of other potentially responsible parties (PRPs). The Company adjusts its accruals to reflect new information as appropriate. Future adjustments could have a material adverse effect on the Company’s consolidated results of operations in a given period, but the Company cannot reliably predict the amounts of such future adjustments.

At June 30, 2021, the Company’s reserves for environmental remediation obligations totaled approximately $13 million, of which $4 million was included in other current liabilities. The reserve includes estimated probable future costs of $3 million for federal Superfund and comparable state-managed sites; $8 million for formerly owned or operated sites for which the Company has remediation or indemnification obligations; and $2 million for owned or controlled sites at which Company operations have been or plan to be discontinued. The timing of expenditures depends on a number of factors that vary by site. The Company expects that it will expend present accruals over many years and that remediation of all sites with which it has been identified will be completed within thirty years. The Company continues to evaluate whether it may be able to recover a portion of past and future costs for environmental liabilities from third parties and to pursue such recoveries where appropriate.

Based on currently available information, it is reasonably possible that costs for recorded matters may exceed the Company’s recorded reserves by as much as $15 million. Future investigation or remediation activities may result in the discovery of additional hazardous materials or potentially higher levels of contamination than discovered during prior investigation, and may impact costs associated with the success or lack thereof in remedial solutions. Therefore, future developments, administrative actions or liabilities relating to environmental matters could have a material adverse effect on the Company’s consolidated financial condition or results of operations.

A number of other lawsuits, claims and proceedings have been or may be asserted against the Company relating to the conduct of its currently and formerly owned businesses, including those pertaining to product liability, environmental, health and safety matters and occupational disease (including as each relates to alleged asbestos exposure), as well as patent infringement, commercial, government contracting, construction, employment, employee and retiree benefits, taxes, environmental, and stockholder and corporate governance matters. While the outcome of litigation cannot be predicted with certainty, and some of these lawsuits, claims or proceedings may be determined adversely to the Company, management does not believe that the disposition of any such pending matters is likely to have a material adverse effect on the Company’s financial condition or liquidity, although the resolution in any reporting period of one or more of these matters could have a material adverse effect on the Company’s consolidated results of operations for that period.

Allegheny Technologies Incorporated and its subsidiary, ATI Titanium LLC (ATI Titanium), are parties to a lawsuit captioned US Magnesium, LLC v. ATI Titanium LLC (Case No. 2:17-cv-00923-DB) and filed in federal district court in Salt Lake City, UT, pertaining to a Supply and Operating Agreement between US Magnesium LLC (USM) and ATI Titanium entered into in 2006 (the Supply Agreement). In 2016, ATI Titanium notified USM that it would suspend performance under the Supply Agreement in reliance on certain terms and conditions included in the Supply Agreement. USM subsequently filed a claim challenging ATI Titanium’s right to suspend performance under the Supply Agreement, claiming that such suspension was a material breach of the Supply Agreement and seeking monetary damages, and ATI Titanium filed a counterclaim for breach of contract against USM. In 2018, USM obtained leave of the court to add Allegheny Technologies Incorporated as a separate party defendant, and ATI Titanium filed a motion to dismiss the claim against Allegheny Technologies Incorporated, which the court denied on April 19, 2019. No trial date has been set by the court given the restrictions of the pandemic. While ATI intends to vigorously defend against and pursue these claims, it cannot predict their outcomes at this time.

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Subsequent Event	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
Subsequent Event	Subsequent EventThe Company’s collective bargaining agreement (CBA) with the United Steel, Paper and Forestry, Rubber, Manufacturing, Energy, Allied & Industrial Service Workers International Union, AFL-CIO, CLC (USW) involving approximately 1,100 active full-time represented employees located primarily within the AA&S segment operations, as well as a number of inactive employees, expired on February 28, 2021. USW-represented employees continued to work under the terms of the expired CBA until March 30, 2021 when they engaged in a strike. On July 14, 2021, ATI announced that a new four-year labor agreement was ratified with the USW, ending the strike. As a result of this new CBA, ATI expects to recognize an approximately $65 million pretax gain in the third quarter of 2021 related to a plan termination that eliminated certain postretirement medical benefit liabilities, comprised of $43 million of long-term postretirement benefit liabilities as of June 30, 2021 and $22 million of amounts recorded in accumulated other comprehensive income at that date. Discrete tax effects related to this event are expected to be approximately $15 million of income tax expense.

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Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Basis Of Accounting

The interim consolidated financial statements include the accounts of Allegheny Technologies Incorporated and its subsidiaries. Unless the context requires otherwise, “Allegheny Technologies,” “ATI” and “the Company” refer to Allegheny Technologies Incorporated and its subsidiaries.These unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and note disclosures required by U.S. generally accepted accounting principles for complete financial statements. In management’s opinion, all adjustments (which include only normal recurring adjustments) considered necessary for a fair presentation have been included. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2020 Annual Report on Form 10-K. The results of operations for these interim periods are not necessarily indicative of the operating results for any future period. The December 31, 2020 financial information has been derived from the Company’s audited consolidated financial statements.

New Accounting Pronouncements Adopted

New Accounting Pronouncements Adopted

In August 2020, the Financial Accounting Standards Board issued new accounting guidance related to accounting for convertible instruments. Under this new guidance, embedded conversion features are no longer separated from the host contract for convertible instruments with conversion features that are not required to be accounted for as derivatives, or that do not result in substantial premiums accounted for as paid-in capital. As such, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. By removing those separation models, the reported interest rate of convertible debt instruments typically will be closer to the coupon interest rate. The new guidance also addresses how convertible instruments are accounted for in the diluted earnings per share calculation, requiring the if-converted method, and requires enhanced disclosures about the terms of convertible instruments and contracts in an entity’s own equity. This new guidance is effective for the Company in fiscal year 2022, with early adoption permitted.

The Company adopted this new accounting guidance related to accounting for convertible instruments effective January 1, 2021 using the modified transition approach with the cumulative effect recognized as an adjustment to the opening balance of retained earnings. This new guidance is applicable to the Company’s 3.5% Convertible Senior Notes due 2025 (the 2025 Convertible Notes) that were issued in June 2020, for which the embedded conversion option was required to be separately accounted for as a component of stockholders’ equity. Upon adoption on January 1, 2021, long-term debt increased by $45.4 million and stockholders’ equity decreased by the same amount, representing the net impact of two adjustments: (1) the $49.8 million value of the embedded conversion, which is net of allocated offering costs, previously classified in additional paid-in capital in stockholders’ equity, and (2) a $4.4 million increase to retained earnings for the cumulative effect of adoption primarily related to the non-cash interest expense recorded in fiscal year 2020 for the amortization of the portion of the 2025 Convertible Notes allocated to stockholders’ equity. Prospectively, the reported interest expense for the 2025 Convertible Notes will no longer include the non-cash interest expense of the equity component as required under prior accounting standards and will be closer to the 3.5% cash coupon rate. There was no impact to the Company’s earnings per share calculation as it previously applied the if-converted method to the 2025 Convertible Notes given ATI’s flexibility to settle conversions of the 2025 Convertible Notes in cash, shares of ATI’s common stock or a combination thereof, at ATI’s election.

Inventory

Inventories are stated at the lower of cost (last-in, first-out (LIFO), first-in, first-out (FIFO), and average cost methods) or market. Most of the Company’s inventory is valued utilizing the LIFO costing methodology. Inventory of the Company’s non-U.S. operations is valued using average cost or FIFO methods. Due to deflationary impacts primarily related to raw materials, the carrying value of the Company’s inventory as valued on LIFO exceeds current replacement cost, and based on a lower of cost or market value analysis, the Company maintains net realizable value (NRV) inventory valuation reserves to adjust the carrying value of LIFO inventory to current replacement cost.

Derivatives

As part of its risk management strategy, the Company, from time-to-time, utilizes derivative financial instruments to manage its exposure to changes in raw material prices, energy costs, foreign currencies, and interest rates. In accordance with applicable accounting standards, the Company accounts for most of these contracts as hedges.

The Company sometimes uses futures and swap contracts to manage exposure to changes in prices for forecasted purchases of raw materials, such as nickel, and natural gas. Under these contracts, which are generally accounted for as cash flow hedges, the price of the item being hedged is fixed at the time that the contract is entered into, and the Company is obligated to make or receive a payment equal to the net change between this fixed price and the market price at the date the contract matures.

The majority of ATI’s products are sold utilizing raw material surcharges and index mechanisms. However, as of June 30, 2021, the Company had entered into financial hedging arrangements, primarily at the request of its customers, related to firm orders, for an aggregate notional amount of approximately 5 million pounds of nickel with hedge dates through 2023. The aggregate notional amount hedged is approximately 10% of a single year’s estimated nickel raw material purchase requirements.

At June 30, 2021, the outstanding financial derivatives used to hedge the Company’s exposure to energy cost volatility included natural gas cost hedges. At June 30, 2021, the Company hedged approximately 70% of its forecasted domestic requirements for natural gas for the remainder of 2021 and approximately 25% for 2022.

While the majority of the Company’s direct export sales are transacted in U.S. dollars, foreign currency exchange contracts are used, from time-to-time, to limit transactional exposure to changes in currency exchange rates for those transactions denominated in a non-U.S. currency. The Company sometimes purchases foreign currency forward contracts that permit it to sell specified amounts of foreign currencies expected to be received from its export sales for pre-established U.S. dollar amounts at specified dates. The forward contracts are denominated in the same foreign currencies in which export sales are denominated. These contracts are designated as hedges of the variability in cash flows of a portion of the forecasted future export sales transactions which otherwise would expose the Company to foreign currency risk, primarily euro. In addition, the Company may also hedge forecasted capital expenditures and designate cash balances held in foreign currencies as hedges of forecasted foreign currency transactions. At June 30, 2021, the Company had no significant outstanding foreign currency forward contracts.

The Company may enter into derivative interest rate contracts to maintain a reasonable balance between fixed- and floating-rate debt. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed rate. The swap matures in June 2024. The Company designated the interest rate swap as a cash flow hedge of the Company’s exposure to the variability of the payment of interest on a portion of its Term Loan borrowings. The ineffectiveness at hedge inception, determined from the fair value of the swap immediately prior to its July 2019 amendment, was amortized to interest expense over the initial Term Loan swap maturity date of January 12, 2021.

There are no credit risk-related contingent features in the Company’s derivative contracts, and the contracts contained no provisions under which the Company has posted, or would be required to post, collateral. The counterparties to the Company’s derivative contracts are substantial and creditworthy commercial banks that are recognized market makers. The Company controls its credit exposure by diversifying across multiple counterparties and by monitoring credit ratings and credit default swap spreads of its counterparties. The Company also enters into master netting agreements with counterparties when possible.

For derivative financial instruments that are designated as cash flow hedges, the gain or loss on the derivative is reported as a component of other comprehensive income (OCI) and reclassified into earnings in the same period or periods during which the hedged item affects earnings. For derivative financial instruments that are designated as fair value hedges, changes in the fair value of these derivatives are recognized in current period results and are reported as changes within accrued liabilities and other on the consolidated statements of cash flows. There were no outstanding fair value hedges as of June 30, 2021. The Company did not use net investment hedges for the periods presented. The effects of derivative instruments in the tables below are presented net of related income taxes, excluding any impacts of changes to income tax valuation allowances affecting results of operations or other comprehensive income, when applicable (see Note 14 for further explanation).

Retirement Benefits

The Company has defined contribution retirement plans or defined benefit pension plans covering substantially all employees. Company contributions to defined contribution retirement plans are generally based on a percentage of eligible pay or based on hours worked. Benefits under the defined benefit pension plans are generally based on years of service and/or final average pay. The Company funds the U.S. pension plans in accordance with the Employee Retirement Income Security Act of 1974, as amended, and the Internal Revenue Code of 1986, as amended (IRC). The Company also sponsors several postretirement plans covering certain collectively-bargained salaried and hourly employees. The plans provide health care and life insurance benefits for eligible retirees. In most retiree health care plans, Company contributions towards premiums are capped based on the cost as of a certain date, thereby creating a defined contribution. All defined benefit pension and retiree health care plans are closed to new entrants.

Commitments And Contingencies

Environmental liabilities are recorded when the Company’s liability is probable and the costs are reasonably estimable. In many cases, however, the Company is not able to determine whether it is liable or, if liability is probable, to reasonably estimate the loss or range of loss. Estimates of the Company’s liability remain subject to additional uncertainties, including the nature and extent of site contamination, available remediation alternatives, the extent of corrective actions that may be required, and the number, participation, and financial condition of other potentially responsible parties (PRPs). The Company adjusts its accruals to reflect new information as appropriate. Future adjustments could have a material adverse effect on the Company’s consolidated results of operations in a given period, but the Company cannot reliably predict the amounts of such future adjustments.

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Inventory (Policies)	6 Months Ended
	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventory	Inventories are stated at the lower of cost (last-in, first-out (LIFO), first-in, first-out (FIFO), and average cost methods) or market. Most of the Company’s inventory is valued utilizing the LIFO costing methodology. Inventory of the Company’s non-U.S. operations is valued using average cost or FIFO methods. Due to deflationary impacts primarily related to raw materials, the carrying value of the Company’s inventory as valued on LIFO exceeds current replacement cost, and based on a lower of cost or market value analysis, the Company maintains net realizable value (NRV) inventory valuation reserves to adjust the carrying value of LIFO inventory to current replacement cost.

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Derivative Instruments and Hedging Activities (Policies)

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

As part of its risk management strategy, the Company, from time-to-time, utilizes derivative financial instruments to manage its exposure to changes in raw material prices, energy costs, foreign currencies, and interest rates. In accordance with applicable accounting standards, the Company accounts for most of these contracts as hedges.

The Company sometimes uses futures and swap contracts to manage exposure to changes in prices for forecasted purchases of raw materials, such as nickel, and natural gas. Under these contracts, which are generally accounted for as cash flow hedges, the price of the item being hedged is fixed at the time that the contract is entered into, and the Company is obligated to make or receive a payment equal to the net change between this fixed price and the market price at the date the contract matures.

The majority of ATI’s products are sold utilizing raw material surcharges and index mechanisms. However, as of June 30, 2021, the Company had entered into financial hedging arrangements, primarily at the request of its customers, related to firm orders, for an aggregate notional amount of approximately 5 million pounds of nickel with hedge dates through 2023. The aggregate notional amount hedged is approximately 10% of a single year’s estimated nickel raw material purchase requirements.

At June 30, 2021, the outstanding financial derivatives used to hedge the Company’s exposure to energy cost volatility included natural gas cost hedges. At June 30, 2021, the Company hedged approximately 70% of its forecasted domestic requirements for natural gas for the remainder of 2021 and approximately 25% for 2022.

While the majority of the Company’s direct export sales are transacted in U.S. dollars, foreign currency exchange contracts are used, from time-to-time, to limit transactional exposure to changes in currency exchange rates for those transactions denominated in a non-U.S. currency. The Company sometimes purchases foreign currency forward contracts that permit it to sell specified amounts of foreign currencies expected to be received from its export sales for pre-established U.S. dollar amounts at specified dates. The forward contracts are denominated in the same foreign currencies in which export sales are denominated. These contracts are designated as hedges of the variability in cash flows of a portion of the forecasted future export sales transactions which otherwise would expose the Company to foreign currency risk, primarily euro. In addition, the Company may also hedge forecasted capital expenditures and designate cash balances held in foreign currencies as hedges of forecasted foreign currency transactions. At June 30, 2021, the Company had no significant outstanding foreign currency forward contracts.

The Company may enter into derivative interest rate contracts to maintain a reasonable balance between fixed- and floating-rate debt. The Company has a $50 million floating-for-fixed interest rate swap which converts a portion of the Term Loan to a 4.21% fixed rate. The swap matures in June 2024. The Company designated the interest rate swap as a cash flow hedge of the Company’s exposure to the variability of the payment of interest on a portion of its Term Loan borrowings. The ineffectiveness at hedge inception, determined from the fair value of the swap immediately prior to its July 2019 amendment, was amortized to interest expense over the initial Term Loan swap maturity date of January 12, 2021.

There are no credit risk-related contingent features in the Company’s derivative contracts, and the contracts contained no provisions under which the Company has posted, or would be required to post, collateral. The counterparties to the Company’s derivative contracts are substantial and creditworthy commercial banks that are recognized market makers. The Company controls its credit exposure by diversifying across multiple counterparties and by monitoring credit ratings and credit default swap spreads of its counterparties. The Company also enters into master netting agreements with counterparties when possible.

For derivative financial instruments that are designated as cash flow hedges, the gain or loss on the derivative is reported as a component of other comprehensive income (OCI) and reclassified into earnings in the same period or periods during which the hedged item affects earnings. For derivative financial instruments that are designated as fair value hedges, changes in the fair value of these derivatives are recognized in current period results and are reported as changes within accrued liabilities and other on the consolidated statements of cash flows. There were no outstanding fair value hedges as of June 30, 2021. The Company did not use net investment hedges for the periods presented. The effects of derivative instruments in the tables below are presented net of related income taxes, excluding any impacts of changes to income tax valuation allowances affecting results of operations or other comprehensive income, when applicable (see Note 14 for further explanation).

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Commitment and Contingencies (Policies)	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Environmental liabilities are recorded when the Company’s liability is probable and the costs are reasonably estimable. In many cases, however, the Company is not able to determine whether it is liable or, if liability is probable, to reasonably estimate the loss or range of loss. Estimates of the Company’s liability remain subject to additional uncertainties, including the nature and extent of site contamination, available remediation alternatives, the extent of corrective actions that may be required, and the number, participation, and financial condition of other potentially responsible parties (PRPs). The Company adjusts its accruals to reflect new information as appropriate. Future adjustments could have a material adverse effect on the Company’s consolidated results of operations in a given period, but the Company cannot reliably predict the amounts of such future adjustments.

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Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 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 second quarters and six months ended June 30, 2021 and 2020 were as follows:

(in millions)	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Global Markets:
Aerospace & Defense	$	218.6	$	62.6	$	281.2	$	252.3	$	113.3	$	365.6
Energy*	48.6		69.7		118.3		22.8		144.7		167.5
Automotive	1.4		66.6		68.0		1.0		49.8		50.8
Electronics	0.2		43.1		43.3		0.2		39.3		39.5
Medical	14.6		17.4		32.0		10.3		19.6		29.9
Construction/Mining	6.1		15.8		21.9		5.0		29.8		34.8
Food Equipment & Appliances	0.1		20.6		20.7		0.1		47.1		47.2
Other	11.0		19.8		30.8		9.0		26.0		35.0
Total	$	300.6	$	315.6	$	616.2	$	300.7	$	469.6	$	770.3

(in millions)	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Global Markets:
Aerospace & Defense	$	398.4	$	137.0	$	535.4	$	611.1	$	247.0	$	858.1
Energy*	79.1		188.3		267.4		46.9		291.2		338.1
Automotive	3.4		156.1		159.5		3.0		124.3		127.3
Electronics	0.5		98.4		98.9		0.5		72.2		72.7
Construction/Mining	11.2		53.2		64.4		10.3		68.1		78.4
Medical	25.8		35.2		61.0		27.3		41.2		68.5
Food Equipment & Appliances	0.1		56.0		56.1		0.1		97.5		97.6
Other	23.0		43.0		66.0		21.8		63.3		85.1
Total	$	541.5	$	767.2	$	1,308.7	$	721.0	$	1,004.8	$	1,725.8

*Includes the oil & gas, downstream processing, and specialty energy markets.

(in millions)	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Primary Geographical Market:
United States	$	157.6	$	172.1	$	329.7	$	166.2	$	311.0	$	477.2
Asia	40.6		94.7		135.3		27.6		91.1		118.7
Europe	86.3		27.1		113.4		92.0		32.4		124.4
Canada	9.3		10.7		20.0		5.1		11.1		16.2
South America, Middle East and other	6.8		11.0		17.8		9.8		24.0		33.8
Total	$	300.6	$	315.6	$	616.2	$	300.7	$	469.6	$	770.3

(in millions)	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Primary Geographical Market:
United States	$	285.9	$	443.7	$	729.6	$	393.5	$	689.8	$	1,083.3
Asia	60.7		217.3		278.0		52.7		185.3		238.0
Europe	165.4		61.1		226.5		225.5		70.0		295.5
Canada	17.5		19.8		37.3		16.7		21.5		38.2
South America, Middle East and other	12.0		25.3		37.3		32.6		38.2		70.8
Total	$	541.5	$	767.2	$	1,308.7	$	721.0	$	1,004.8	$	1,725.8

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 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 conversion service sales in the AA&S segment are excluded from this presentation.

	Second quarter ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Products and Services:
High-Value Products
Nickel-based alloys and specialty alloys	45	%	21	%	33	%	36	%	32	%	34	%
Precision rolled strip products	—	%	39	%	19	%	—	%	20	%	12	%
Precision forgings, castings and components	36	%	—	%	18	%	35	%	—	%	14	%
Titanium and titanium-based alloys	19	%	6	%	13	%	29	%	13	%	19	%
Zirconium and related alloys	—	%	24	%	12	%	—	%	14	%	8	%
Total High-Value Products	100	%	90	%	95	%	100	%	79	%	87	%
Standard Products
Standard stainless products	—	%	10	%	5	%	—	%	21	%	13	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

	Six months ended
	June 30, 2021						June 30, 2020
	HPMC		AA&S		Total		HPMC		AA&S		Total
Diversified Products and Services:
High-Value Products
Nickel-based alloys and specialty alloys	41	%	25	%	32	%	38	%	28	%	34	%
Precision rolled strip products	—	%	35	%	20	%	—	%	18	%	12	%
Precision forgings, castings and components	39	%	—	%	17	%	35	%	—	%	15	%
Titanium and titanium-based alloys	20	%	6	%	12	%	27	%	10	%	18	%
Zirconium and related alloys	—	%	19	%	10	%	—	%	12	%	8	%
Total High-Value Products	100	%	85	%	91	%	100	%	68	%	87	%
Standard Products
Standard stainless products	—	%	15	%	9	%	—	%	32	%	13	%
Total	100	%	100	%	100	%	100	%	100	%	100	%

Schedule of Accounts Receivable - Reserve for Doubtful Accounts

(in millions)
Accounts Receivable - Reserve for Doubtful Accounts	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	4.3	$	4.6
Expense to increase the reserve	—		0.2
Write-off of uncollectible accounts	(0.4)		(0.3)
Balance as of period end	$	3.9	$	4.5

Schedule of Contract Assets and Liabilities

(in millions)
Contract Assets
Short-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	38.9	$	38.5
Recognized in current year	48.9		37.5
Reclassified to accounts receivable	(30.4)		(34.5)
Impairment	—		—
Reclassification to/from long-term and contract liability	(5.1)		0.1
Balance as of period end	$	52.3	$	41.6
Long-term	June 30, 2021		June 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-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	111.8	$	78.7
Recognized in current year	77.9		97.9
Amounts in beginning balance reclassified to revenue	(63.9)		(33.9)
Current year amounts reclassified to revenue	(18.7)		(38.5)
Other	—		(0.2)
Reclassification to/from long-term and contract asset	(3.3)		5.8
Balance as of period end	$	103.8	$	109.8
Long-term	June 30, 2021		June 30, 2020
Balance as of beginning of fiscal year	$	32.0	$	25.9
Recognized in current year	41.0		12.4
Amounts in beginning balance reclassified to revenue	(0.5)		(0.5)
Current year amounts reclassified to revenue	—		—
Other	—		—
Reclassification to/from short-term	(1.8)		(5.8)
Balance as of period end	$	70.7	$	32.0

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Inventories (Tables)

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories at June 30, 2021 and December 31, 2020 were as follows (in millions):

	June 30, 2021		December 31, 2020
Raw materials and supplies	$	206.3	$	207.6
Work-in-process	782.5		690.7
Finished goods	143.9		181.6
Total inventories at current cost	1,132.7		1,079.9
Adjustment from current cost to LIFO cost basis	29.9		44.1
Inventory valuation reserves	(103.6)		(126.9)
Total inventories, net	$	1,059.0	$	997.1

Schedule of Inventory Valuation Impact on Income

Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):

	Six months ended June 30,
	2021		2020
LIFO benefit (charge)	$	(14.1)	$	14.0
NRV benefit (charge)	14.1		(14.0)
Net cost of sales impact	$	—	$	—

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Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

Property Plant And Equipment

Property, plant and equipment at June 30, 2021 and December 31, 2020 was as follows (in millions):

	June 30, 2021		December 31, 2020
Land	$	34.9	$	34.8
Buildings	574.6		564.7
Equipment and leasehold improvements	2,791.8		2,736.9
	3,401.3		3,336.4
Accumulated depreciation and amortization	(1,915.0)		(1,867.2)
Total property, plant and equipment, net	$	1,486.3	$	1,469.2

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Supplemental Financial Statement Information - (Tables)

6 Months Ended

Jun. 30, 2021

Other Income and Expenses [Abstract]

Schedule of Other Expense, Net

Other income (expense), net for the three and six months ended June 30, 2021 and 2020 was as follows:

(in millions)	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Rent and royalty income	$	0.2	$	0.2	$	0.5	$	0.5
Gains from disposal of property, plant and equipment, net	1.2		—		2.4		2.5
Net equity loss on joint ventures (See Note 5)	—		(1.9)		—		(5.6)
Joint venture restructuring charges (See Note 5)	—		(2.4)		—		(2.4)
Adjustment to indemnification for conditional ARO costs	—		4.3		—		4.3
Other	—		0.3		—		0.3
Total other income (expense), net	$	1.4	$	0.5	$	2.9	$	(0.4)

Roll Forward of Restructuring Reserve Activity

Restructuring reserves for severance cost activity is as follows:

	Severance and Employee
	Benefit Costs
Balance at December 31, 2020	$	43.4
Adjustments	(6.9)
Payments	(10.2)
Balance at June 30, 2021	$	26.3

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Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of Debt Instruments

Debt at June 30, 2021 and December 31, 2020 was as follows (in millions): 

	June 30, 2021		December 31, 2020
Allegheny Technologies 5.875% Notes due 2023 (a)	$	500.0	$	500.0
Allegheny Technologies 5.875% Notes due 2027	350.0		350.0
Allegheny Technologies 3.5% Convertible Senior Notes due 2025	291.4		291.4
Allegheny Technologies 4.75% Convertible Senior Notes due 2022	84.2		84.2
Allegheny Ludlum 6.95% Debentures due 2025 (b)	150.0		150.0
Term Loan due 2024	200.0		200.0
U.S. revolving credit facility	—		—
Foreign credit facilities	4.6		5.5
Finance leases and other	55.5		48.0
Debt issuance costs	(14.2)		(14.5)
Equity component of convertible debt	—		(46.8)
Total debt	1,621.5		1,567.8
Short-term debt and current portion of long-term debt	19.3		17.8
Total long-term debt	$	1,602.2	$	1,550.0

(a) Bearing interest at 7.875% effective February 15, 2016.

(b) The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed

by ATI.

Interest Income and Interest Expense Disclosure

Interest expense on the 2025 Convertible Notes was as follows:

	Three months ended June 30,		Six months ended June 30,
(in millions)	2021		2021
Contractual coupon rate	$	2.5	$	5.1
Amortization of debt issuance costs	0.4		0.8
Total interest expense	$	2.9	$	5.9

Interest expense on the 2022 Convertible Notes was as follows:

	Three months ended June 30,				Six months ended June 30,
(in millions)	2021		2020		2021		2020
Contractual coupon rate	$	1.0	$	3.2	$	2.0	$	6.6
Amortization of debt issuance costs	0.1		0.4		0.2		0.8
Total interest expense	$	1.1	$	3.6	$	2.2	$	7.4

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Derivative Financial Instruments and Hedging (Tables)

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value

The fair values of the Company’s derivative financial instruments are presented below, representing the gross amounts recognized which are not offset by counterparty or by type of item hedged. All fair values for these derivatives were measured using Level 2 information as defined by the accounting standard hierarchy, which includes quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs derived principally from or corroborated by observable market data.

(In millions) Asset derivatives	Balance sheet location	June 30, 2021		December 31, 2020
Derivatives designated as hedging instruments:
Nickel and other raw material contracts	Prepaid expenses and other current assets	$	3.8	$	3.7
Natural gas contracts	Prepaid expenses and other current assets	2.6		0.2
Nickel and other raw material contracts	Other assets	0.8		0.7
Natural gas contracts	Other assets	0.4		0.2
Total derivatives designated as hedging instruments		$	7.6	$	4.8
Liability derivatives	Balance sheet location
Derivatives designated as hedging instruments:
Interest rate swap	Other current liabilities	$	1.0	$	1.0
Natural gas contracts	Other current liabilities	—		0.3
Nickel and other raw material contracts	Other current liabilities	—		0.1
Interest rate swap	Other long-term liabilities	1.6		2.5
Natural gas contracts	Other long-term liabilities	—		0.1
Total derivatives designated as hedging instruments		$	2.6	$	4.0

Schedule Of Derivative Instruments Gain Loss In Statement Of Financial Performance

Activity with regard to derivatives designated as cash flow hedges for the three and six month periods ended June 30, 2021 and 2020 was as follows (in millions): 

	Amount of Gain (Loss) Recognized in OCI on Derivatives				Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (a)
	Three months ended June 30,				Three months ended June 30,
Derivatives in Cash Flow Hedging Relationships	2021		2020		2021		2020
Nickel and other raw material contracts	$	3.4	$	2.0	$	1.1	$	(1.8)
Natural gas contracts	2.0		(0.1)		0.2		(1.0)
Foreign exchange contracts	—		—		—		(0.1)
Interest rate swap	(0.3)		(0.3)		(0.2)		(0.3)
Total	$	5.1	$	1.6	$	1.1	$	(3.2)

	Amount of Gain (Loss) Recognized in OCI on Derivatives				Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (a)
	Six months ended June 30,				Six months ended June 30,
Derivatives in Cash Flow Hedging Relationships	2021		2020		2021		2020
Nickel and other raw material contracts	$	2.8	$	(4.2)	$	2.6	$	(2.0)
Natural gas contracts	2.4		(1.3)		0.2		(2.0)
Foreign exchange contracts	0.1		(0.1)		—		(0.1)
Interest rate swap	0.1		(2.2)		(0.4)		(0.5)
Total	$	5.4	$	(7.8)	$	2.4	$	(4.6)

(a)The gains (losses) reclassified from accumulated OCI into income related to the derivatives, with the exception of the interest rate swap, are presented in cost of sales in the same period or periods in which the hedged item affects earnings. The gains (losses) reclassified from accumulated OCI into income on the interest rate swap are presented in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings.

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value By Balance Sheet Grouping

The estimated fair value of financial instruments at June 30, 2021 was as follows: 

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	472.5	$	472.5	$	472.5	$	—
Derivative financial instruments:
Assets	7.6		7.6		—		7.6
Liabilities	2.6		2.6		—		2.6
Debt (a)	1,635.7		1,930.0		1,669.9		260.1

The estimated fair value of financial instruments at December 31, 2020 was as follows: 

			Fair Value Measurements at Reporting Date Using
(In millions)	Total Carrying Amount		Total Estimated Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)
Cash and cash equivalents	$	645.9	$	645.9	$	645.9	$	—
Derivative financial instruments:
Assets	4.8		4.8		—		4.8
Liabilities	4.0		4.0		—		4.0
Debt (a)	1,629.1		1,847.7		1,594.2		253.5

(a)The total carrying amount for debt for both periods excludes debt issuance costs related to the recognized debt liability which is presented in the consolidated balance sheet as a direct reduction from the carrying amount of the debt liability. The December 31, 2020 debt carrying value includes $46.8 million for the unamortized balance of the portion of the 2025 Convertible Notes recorded in stockholders’ equity due to the flexible settlement feature of the notes. Effective January 1, 2021, ATI early-adopted new accounting guidance that eliminated the equity component classification of the embedded conversion option of the 2025 Convertible Notes (see Note 1).

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Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2021

Retirement Benefits [Abstract]

Schedule Of Defined Benefit Plans Disclosures [Table Text Block]

For the three month periods ended June 30, 2021 and 2020, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions): 

	Pension Benefits				Other Postretirement Benefits
	Three months ended June 30,				Three months ended June 30,
	2021		2020		2021		2020
Service cost - benefits earned during the year	$	3.7	$	3.1	$	0.4	$	0.6
Interest cost on benefits earned in prior years	17.1		21.6		2.1		2.7
Expected return on plan assets	(34.1)		(33.6)		—		—
Amortization of prior service cost (credit)	0.1		0.2		(0.6)		(1.0)
Amortization of net actuarial loss	18.9		18.6		3.3		2.7
Total retirement benefit expense	$	5.7	$	9.9	$	5.2	$	5.0

For the six month periods ended June 30, 2021 and 2020, the components of pension and other postretirement benefit expense for the Company’s defined benefit plans included the following (in millions):

	Pension Benefits				Other Postretirement Benefits
	Six months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Service cost - benefits earned during the year	$	7.5	$	6.3	$	0.7	$	1.1
Interest cost on benefits earned in prior years	34.2		43.1		4.2		5.4
Expected return on plan assets	(68.2)		(67.2)		—		—
Amortization of prior service cost (credit)	0.3		0.4		(1.3)		(1.9)
Amortization of net actuarial loss	37.8		37.2		6.6		5.4
Total retirement benefit expense	$	11.6	$	19.8	$	10.2	$	10.0

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Business Segments (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule Of Segment Reporting Information By Segment

Following is certain financial information with respect to the Company’s business segments for the periods indicated (in millions):

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Total sales:
High Performance Materials & Components	$	318.7	$	316.7	$	583.9	$	765.2
Advanced Alloys & Solutions	339.4		506.2		815.4		1,093.8
	658.1		822.9		1,399.3		1,859.0
Intersegment sales:
High Performance Materials & Components	18.1		16.0		42.4		44.2
Advanced Alloys & Solutions	23.8		36.6		48.2		89.0
	41.9		52.6		90.6		133.2
Sales to external customers:
High Performance Materials & Components	300.6		300.7		541.5		721.0
Advanced Alloys & Solutions	315.6		469.6		767.2		1,004.8
	$	616.2	$	770.3	$	1,308.7	$	1,725.8

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
EBITDA:
High Performance Materials & Components	$	37.2	$	28.7	$	61.8	$	105.3
Advanced Alloys & Solutions	36.0		33.4		85.7		74.5
Total segment EBITDA	73.2		62.1		147.5		179.8
LIFO and net realizable value reserves	—		—		—		—
Corporate expenses	(15.9)		(7.2)		(28.1)		(19.5)
Closed operations and other income (expense)	(3.6)		2.7		(3.1)		(3.6)
Total ATI Adjusted EBITDA	53.7		57.6		116.3		156.7
Depreciation & amortization (a)	(36.3)		(35.6)		(72.4)		(72.9)
Interest expense, net	(23.7)		(21.7)		(47.1)		(43.6)
Restructuring and other credits (charges) (See Note 6)	6.2		(16.7)		6.2		(24.7)
Strike related costs	(40.3)		—		(40.3)		—
Impairment of goodwill	—		(287.0)		—		(287.0)
Joint venture restructuring charge (See Note 5)	—		(2.4)		—		(2.4)
Debt extinguishment charge (See Note 7)	—		(21.5)		—		(21.5)
Gain on asset sales	—		—		—		2.5
Loss before income taxes	$	(40.4)	$	(327.3)	$	(37.3)	$	(292.9)

(a) The following is depreciation & amortization by each business segment:

	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
High Performance Materials & Components	$	19.2	$	19.5	$	38.8	$	39.0
Advanced Alloys & Solutions	16.1		15.3		31.6		32.3
Other	1.0		0.8		2.0		1.6
	$	36.3	$	35.6	72.4		72.9

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Per Share Information (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Diluted By Common Class

The following table sets forth the computation of basic and diluted loss per common share: 

(In millions, except per share amounts)	Three months ended June 30,				Six months ended June 30,
	2021		2020		2021		2020
Numerator:
Numerator for basic loss per common share –
Net loss attributable to ATI	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Effect of dilutive securities:
4.75% Convertible Senior Notes due 2022	—		—		—		—
3.5% Convertible Senior Notes due 2025	—		—		—		—
Numerator for diluted loss per common share –
Net loss attributable to ATI after assumed conversions	$	(49.2)	$	(422.6)	$	(57.1)	$	(401.5)
Denominator:
Denominator for basic net loss per common share – weighted average shares	127.1		126.6		127.0		126.4
Effect of dilutive securities:
Share-based compensation	—		—		—		—
4.75% Convertible Senior Notes due 2022	—		—		—		—
3.5% Convertible Senior Notes due 2025	—		—		—		—
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions	127.1		126.6		127.0		126.4
Basic net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)
Diluted net loss attributable to ATI per common share	$	(0.39)	$	(3.34)	$	(0.45)	$	(3.18)

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Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2021

Equity [Abstract]

Schedule Of Accumulated Other Comprehensive Income Loss

The changes in AOCI by component, net of tax, for the three month period ended June 30, 2021 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, March 31, 2021	$	(1,103.4)	$	(60.9)	$	1.1	$	(45.4)	$	(1,208.6)
OCI before reclassifications		—		5.1		5.1		—	10.2
Amounts reclassified from AOCI	(a)	16.5	(b)	—	(c)	(1.1)	(d)	6.7	22.1
Net current-period OCI		16.5		5.1		4.0		6.7	32.3
Balance, June 30, 2021	$	(1,086.9)	$	(55.8)	$	5.1	$	(38.7)	$	(1,176.3)
Attributable to noncontrolling interests:
Balance, March 31, 2021	$	—	$	21.8	$	—	$	—	$	21.8
OCI before reclassifications		—		1.9		—		—	1.9
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		1.9		—		—	1.9
Balance, June 30, 2021	$	—	$	23.7	$	—	$	—	$	23.7

The changes in AOCI by component, net of tax, for the six month period ended June 30, 2021 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, December 31, 2020	$	(1,119.9)	$	(55.5)	$	2.1	$	(50.3)	$	(1,223.6)
OCI before reclassifications		—		(0.3)		5.4		—	5.1
Amounts reclassified from AOCI	(a)	33.0	(b)	—	(c)	(2.4)	(d)	11.6	42.2
Net current-period OCI		33.0		(0.3)		3.0		11.6	47.3
Balance, June 30, 2021	$	(1,086.9)	$	(55.8)	$	5.1	$	(38.7)	$	(1,176.3)
Attributable to noncontrolling interests:
Balance, December 31, 2020	$	—	$	21.2	$	—	$	—	$	21.2
OCI before reclassifications		—		2.5		—		—	2.5
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		2.5		—		—	2.5
Balance, June 30, 2021	$	—	$	23.7	$	—	$	—	$	23.7

(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

(b)No amounts were reclassified to earnings.

(c)Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

(d)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

The changes in AOCI by component, net of tax, for the three month period ended June 30, 2020 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, March 31, 2020	$	(1,067.4)	$	(99.2)	$	(8.5)	$	(41.5)	$	(1,216.6)
OCI before reclassifications		—		14.7		1.6		—	16.3
Amounts reclassified from AOCI	(a)	15.6	(b)	—	(c)	3.2	(d)	8.7	27.5
Net current-period OCI		15.6		14.7		4.8		8.7	43.8
Balance, June 30, 2020	$	(1,051.8)	$	(84.5)	$	(3.7)	$	(32.8)	$	(1,172.8)
Attributable to noncontrolling interests:
Balance, March 31, 2020	$	—	$	9.0	$	—	$	—	$	9.0
OCI before reclassifications		—		(0.5)		—		—	(0.5)
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		(0.5)		—		—	$	(0.5)
Balance, June 30, 2020	$	—	$	8.5	$	—	$	—	$	8.5

The changes in AOCI by component, net of tax, for the six month period ended June 30, 2020 were as follows (in millions):

	Post- retirement benefit plans		Currency translation adjustment		Derivatives		Deferred Tax Asset Valuation Allowance		Total
Attributable to ATI:
Balance, December 31, 2019	$	(1,083.1)	$	(76.6)	$	(0.5)	$	(41.5)	$	(1,201.7)
OCI before reclassifications		—		(7.9)		(7.8)		—	(15.7)
Amounts reclassified from AOCI	(a)	31.3	(b)	—	(c)	4.6	(d)	8.7	44.6
Net current-period OCI		31.3		(7.9)		(3.2)		8.7	28.9
Balance, June 30, 2020	$	(1,051.8)	$	(84.5)	$	(3.7)	$	(32.8)	$	(1,172.8)
Attributable to noncontrolling interests:
Balance, December 31, 2019	$	—	$	9.8	$	—	$	—	$	9.8
OCI before reclassifications		—		(1.3)		—		—	(1.3)
Amounts reclassified from AOCI		—	(b)	—		—		—	—
Net current-period OCI		—		(1.3)		—		—	$	(1.3)
Balance, June 30, 2020	$	—	$	8.5	$	—	$	—	$	8.5

(a)Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

(b)No amounts were reclassified to earnings.

(c)Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

(d)Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

Reclassification out of Accumulated Other Comprehensive Income

Reclassifications out of AOCI for the three and six month periods ended June 30, 2021 and 2020 were as follows: 

	Amounts reclassified to AOCI
Details about AOCI Components (In millions)	Three months ended June 30, 2021		Three months ended June 30, 2020		Six months ended June 30, 2021		Six months ended June 30, 2020			Affected line item in the statements of operations
Postretirement benefit plans
Prior service credit	$	0.5	$	0.8	$	1.0	$	1.5	(a)
Actuarial losses	(22.2)		(21.3)		(44.4)		(42.6)		(a)
	(21.7)		(20.5)		(43.4)		(41.1)		(c)	Total before tax
	(5.2)		(4.9)		(10.4)		(9.8)			Tax benefit (d)
	$	(16.5)	$	(15.6)	$	(33.0)	$	(31.3)		Net of tax
Derivatives
Nickel and other raw material contracts	$	1.4	$	(2.3)	$	3.4	$	(2.6)	(b)
Natural gas contracts	0.3		(1.3)		0.3		(2.6)		(b)
Foreign exchange contracts	—		(0.1)		—		(0.1)		(b)
Interest rate swap	(0.2)		(0.5)		(0.5)		(0.7)		(b)
	1.5		(4.2)		3.2		(6.0)		(c)	Total before tax
	0.4		(1.0)		0.8		(1.4)			Tax expense (benefit) (d)
	$	1.1	$	(3.2)	$	2.4	$	(4.6)		Net of tax

(a)Amounts are reported in nonoperating retirement benefit expense (see Note 10).

(b)Amounts related to derivatives, with the exception of the interest rate swap, are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the interest rate swap are included in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings (see Note 8).

(c)For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.

(d)These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable.

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Accounting Policies (Accounting Pronouncements) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revenue recognition [Line Items]
Number of business segments | segment			2
Impact of new accounting principle on prior period operating income	$ (11.3)	$ (273.4)	$ 20.5	$ (205.0)
Unfavorable impact on pre-tax operating results	40.4	327.3	37.3	292.9
Equity adjustment for adoption	606.1	1,842.3	606.1	1,842.3	$ 609.3		$ 641.4	$ 2,192.6	$ 2,193.2
Additional Paid-in Capital [Member]
Revenue recognition [Line Items]
Equity adjustment for adoption	1,587.5	1,617.8	1,587.5	1,617.8	1,580.5		1,625.5	1,592.1	1,618.0
[RetainedEarningsMember]
Revenue recognition [Line Items]
Equity adjustment for adoption	$ 53.8	$ 1,277.6	$ 53.8	$ 1,277.6	$ 103.0		$ 106.5	$ 1,700.4	$ 1,679.3
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt
Revenue recognition [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%		3.50%				3.50%
Accounting Standards Update 2020-06 | Additional Paid-in Capital [Member]
Revenue recognition [Line Items]
Equity adjustment for adoption						$ (49.8)
Accounting Standards Update 2020-06 | [RetainedEarningsMember]
Revenue recognition [Line Items]
Equity adjustment for adoption						4.4
Accounting Standards Update 2020-06 | Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt
Revenue recognition [Line Items]
Equity adjustment for adoption						$ (45.4)
Allegheny & Tsingshan Stainless
Revenue recognition [Line Items]
Equity method investment ownership percentage	50.00%		50.00%
Uniti
Revenue recognition [Line Items]
Equity method investment ownership percentage	50.00%		50.00%
Allegheny Technologies Inc | Shanghai STAL Precision Stainless Steel Co Ltd | Advanced Alloys & Solutions [Member]
Revenue recognition [Line Items]
Joint venture ownership percentage	60.00%		60.00%

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Revenue from Contracts with Customers - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revenue recognition [Line Items]
Inventories, net	$ 1,059,000,000.0		$ 1,059,000,000.0		$ 997,100,000
Adjustment from current cost to LIFO cost basis	(29,900,000)		(29,900,000)		(44,100,000)
Sales	616,200,000	$ 770,300,000	1,308,700,000	$ 1,725,800,000
Cost of sales	573,500,000	695,600,000	1,180,200,000	1,516,300,000
Short-term contract assets	52,300,000	41,600,000	52,300,000	41,600,000	38,900,000	$ 38,500,000
Long-term contract assets	0	0	0	0	0	100,000
Other current liabilities	210,200,000		210,200,000		233,100,000
Other long-term liabilities	220,100,000		220,100,000		189,900,000
Short-term contract liabilities	103,800,000	109,800,000	103,800,000	109,800,000	111,800,000	78,700,000
Long-term contract liabilities	70,700,000	32,000,000.0	$ 70,700,000	32,000,000.0	32,000,000.0	$ 25,900,000
Number of business segments | segment			2
Revenue, Performance Obligation [Abstract]
Confirmed order backlog	1,600,000,000	1,500,000,000	$ 1,600,000,000	1,500,000,000
Confirmed orders with current performance obligations	0.75		0.75
Accounts receivable with customers	366,100,000		366,100,000		350,100,000
Contract costs for obtaining and fulfilling contracts	5,500,000		5,500,000		$ 5,400,000
Amortization of contract costs	$ 300,000	$ 400,000	$ 500,000	$ 700,000

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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue		$ 616.2	$ 770.3	$ 1,308.7	$ 1,725.8
Percent of revenue		100.00%	100.00%	100.00%	100.00%
Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue		95.00%	87.00%	91.00%	87.00%
Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		33.00%	34.00%	32.00%	34.00%
Precision rolled strip products
Disaggregation of Revenue [Line Items]
Percent of revenue		19.00%	12.00%	20.00%	12.00%
Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue		18.00%	14.00%	17.00%	15.00%
Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		13.00%	19.00%	12.00%	18.00%
Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		12.00%	8.00%	10.00%	8.00%
Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of revenue		5.00%	13.00%	9.00%	13.00%
United States
Disaggregation of Revenue [Line Items]
Revenue		$ 329.7	$ 477.2	$ 729.6	$ 1,083.3
Asia
Disaggregation of Revenue [Line Items]
Revenue		135.3	118.7	278.0	238.0
Europe
Disaggregation of Revenue [Line Items]
Revenue		113.4	124.4	226.5	295.5
Canada
Disaggregation of Revenue [Line Items]
Revenue		20.0	16.2	37.3	38.2
South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue		17.8	33.8	37.3	70.8
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue		281.2	365.6	535.4	858.1
Energy
Disaggregation of Revenue [Line Items]
Revenue	[1]	118.3	167.5	267.4	338.1
Automotive
Disaggregation of Revenue [Line Items]
Revenue		68.0	50.8	159.5	127.3
Electronics
Disaggregation of Revenue [Line Items]
Revenue		43.3	39.5	98.9	72.7
Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue		21.9	34.8	64.4	78.4
Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue		20.7	47.2	56.1	97.6
Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue		32.0	29.9	61.0	68.5
Other
Disaggregation of Revenue [Line Items]
Revenue		30.8	35.0	66.0	85.1
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue		658.1	822.9	1,399.3	1,859.0
Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue		$ 318.7	$ 316.7	$ 583.9	$ 765.2
Percent of revenue		100.00%	100.00%	100.00%	100.00%
Operating Segments | High Performance Materials & Components | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue		100.00%	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 revenue		45.00%	36.00%	41.00%	38.00%
Operating Segments | High Performance Materials & Components | Precision rolled strip products
Disaggregation of Revenue [Line Items]
Percent of revenue		0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue		36.00%	35.00%	39.00%	35.00%
Operating Segments | High Performance Materials & Components | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		19.00%	29.00%	20.00%	27.00%
Operating Segments | High Performance Materials & Components | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of revenue		0.00%	0.00%	0.00%	0.00%
Operating Segments | High Performance Materials & Components | United States
Disaggregation of Revenue [Line Items]
Revenue		$ 157.6	$ 166.2	$ 285.9	$ 393.5
Operating Segments | High Performance Materials & Components | Asia
Disaggregation of Revenue [Line Items]
Revenue		40.6	27.6	60.7	52.7
Operating Segments | High Performance Materials & Components | Europe
Disaggregation of Revenue [Line Items]
Revenue		86.3	92.0	165.4	225.5
Operating Segments | High Performance Materials & Components | Canada
Disaggregation of Revenue [Line Items]
Revenue		9.3	5.1	17.5	16.7
Operating Segments | High Performance Materials & Components | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue		6.8	9.8	12.0	32.6
Operating Segments | High Performance Materials & Components | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue		218.6	252.3	398.4	611.1
Operating Segments | High Performance Materials & Components | Energy
Disaggregation of Revenue [Line Items]
Revenue	[1]	48.6	22.8	79.1	46.9
Operating Segments | High Performance Materials & Components | Automotive
Disaggregation of Revenue [Line Items]
Revenue		1.4	1.0	3.4	3.0
Operating Segments | High Performance Materials & Components | Electronics
Disaggregation of Revenue [Line Items]
Revenue		0.2	0.2	0.5	0.5
Operating Segments | High Performance Materials & Components | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue		6.1	5.0	11.2	10.3
Operating Segments | High Performance Materials & Components | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue		0.1	0.1	0.1	0.1
Operating Segments | High Performance Materials & Components | Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue		14.6	10.3	25.8	27.3
Operating Segments | High Performance Materials & Components | Other
Disaggregation of Revenue [Line Items]
Revenue		11.0	9.0	23.0	21.8
Operating Segments | Advanced Alloys & Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue		$ 339.4	$ 506.2	$ 815.4	$ 1,093.8
Percent of revenue		100.00%	100.00%	100.00%	100.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Total High-Value Products
Disaggregation of Revenue [Line Items]
Percent of revenue		90.00%	79.00%	85.00%	68.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Nickel-based alloys and specialty alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		21.00%	32.00%	25.00%	28.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision rolled strip products
Disaggregation of Revenue [Line Items]
Percent of revenue		39.00%	20.00%	35.00%	18.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Precision forgings, castings and components
Disaggregation of Revenue [Line Items]
Percent of revenue		0.00%	0.00%	0.00%	0.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Titanium and titanium-based alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		6.00%	13.00%	6.00%	10.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Zirconium and related alloys
Disaggregation of Revenue [Line Items]
Percent of revenue		24.00%	14.00%	19.00%	12.00%
Operating Segments | Advanced Alloys & Solutions [Member] | Standard stainless products
Disaggregation of Revenue [Line Items]
Percent of revenue		10.00%	21.00%	15.00%	32.00%
Operating Segments | Advanced Alloys & Solutions [Member] | United States
Disaggregation of Revenue [Line Items]
Revenue		$ 172.1	$ 311.0	$ 443.7	$ 689.8
Operating Segments | Advanced Alloys & Solutions [Member] | Asia
Disaggregation of Revenue [Line Items]
Revenue		94.7	91.1	217.3	185.3
Operating Segments | Advanced Alloys & Solutions [Member] | Europe
Disaggregation of Revenue [Line Items]
Revenue		27.1	32.4	61.1	70.0
Operating Segments | Advanced Alloys & Solutions [Member] | Canada
Disaggregation of Revenue [Line Items]
Revenue		10.7	11.1	19.8	21.5
Operating Segments | Advanced Alloys & Solutions [Member] | South America, Middle East and other
Disaggregation of Revenue [Line Items]
Revenue		11.0	24.0	25.3	38.2
Operating Segments | Advanced Alloys & Solutions [Member] | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Revenue		62.6	113.3	137.0	247.0
Operating Segments | Advanced Alloys & Solutions [Member] | Energy
Disaggregation of Revenue [Line Items]
Revenue	[1]	69.7	144.7	188.3	291.2
Operating Segments | Advanced Alloys & Solutions [Member] | Automotive
Disaggregation of Revenue [Line Items]
Revenue		66.6	49.8	156.1	124.3
Operating Segments | Advanced Alloys & Solutions [Member] | Electronics
Disaggregation of Revenue [Line Items]
Revenue		43.1	39.3	98.4	72.2
Operating Segments | Advanced Alloys & Solutions [Member] | Construction/Mining
Disaggregation of Revenue [Line Items]
Revenue		15.8	29.8	53.2	68.1
Operating Segments | Advanced Alloys & Solutions [Member] | Food Equipment & Appliances
Disaggregation of Revenue [Line Items]
Revenue		20.6	47.1	56.0	97.5
Operating Segments | Advanced Alloys & Solutions [Member] | Medical Market [Member]
Disaggregation of Revenue [Line Items]
Revenue		17.4	19.6	35.2	41.2
Operating Segments | Advanced Alloys & Solutions [Member] | Other
Disaggregation of Revenue [Line Items]
Revenue		19.8	26.0	43.0	63.3
External Customers | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue		616.2	770.3	1,308.7	1,725.8
External Customers | Operating Segments | High Performance Materials & Components
Disaggregation of Revenue [Line Items]
Revenue		300.6	300.7	541.5	721.0
External Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenue		$ 315.6	$ 469.6	$ 767.2	$ 1,004.8

[1] Includes the oil & gas, downstream processing, and specialty energy markets.

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Revenue from Contracts with Customers - Accounts Receivable Reserve for Doubtful Accounts (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of fiscal year	$ 4.3	$ 4.6
Expense to increase the reserve	0.0	0.2
Write-off of uncollectible accounts	(0.4)	(0.3)
Balance as of period end	$ 3.9	$ 4.5

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Revenue from Contracts with Customers - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Contract Assets, Current [Roll Forward]
Balance as of beginning of fiscal year	$ 38.9	$ 38.5
Recognized in current year	48.9	37.5
Reclassified to accounts receivable	(30.4)	(34.5)
Impairment	0.0	0.0
Reclassification to/from long-term and contract liability	(5.1)	0.1
Balance as of period end	52.3	41.6
Contract Assets, Noncurrent [Roll Forward]
Balance as of beginning of fiscal year	0.0	0.1
Recognized in current year	0.0	0.0
Reclassified to accounts receivable	0.0	0.0
Impairment	0.0	0.0
Reclassification to/from short-term	0.0	(0.1)
Balance as of period end	0.0	0.0
Contract Liabilities, Current [Roll Forward]
Balance as of beginning of fiscal year	111.8	78.7
Recognized in current year	77.9	97.9
Amounts in beginning balance reclassified to revenue	(63.9)	(33.9)
Current year amounts reclassified to revenue	(18.7)	(38.5)
Other	0.0	(0.2)
Reclassification to/from long-term and contract asset	(3.3)	5.8
Balance as of period end	103.8	109.8
Contract Liabilities, Noncurrent [Roll Forward]
Balance as of beginning of fiscal year	32.0	25.9
Recognized in current year	41.0	12.4
Amounts in beginning balance reclassified to revenue	(0.5)	(0.5)
Current year amounts reclassified to revenue	0.0	0.0
Other	0.0	0.0
Reclassification to/from short-term	(1.8)	(5.8)
Balance as of period end	$ 70.7	$ 32.0

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Inventories (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Inventory [Line Items]
Raw materials and supplies	$ 206.3		$ 206.3		$ 207.6
Work-in-process	782.5		782.5		690.7
Finished goods	143.9		143.9		181.6
Total inventories at current cost	1,132.7		1,132.7		1,079.9
Adjustment from current cost to LIFO cost basis	29.9		29.9		44.1
Inventory valuation reserves	(103.6)		(103.6)		(126.9)
Total inventories, net	1,059.0		1,059.0		997.1
LIFO benefit (charge)			(14.1)	$ 14.0
NRV benefit (charge)			14.1	(14.0)
Net cost of sales impact	0.0	$ 0.0	0.0	$ 0.0
Net Realizable Value Reserve [Member]
Inventory [Line Items]
Inventory valuation reserves	$ (29.9)		$ (29.9)		$ (44.1)

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Property, Plant and Equipment (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Land	$ 34.9	$ 34.8
Buildings	574.6	564.7
Equipment and leasehold improvements	2,791.8	2,736.9
Property Plant And Equipment, gross	3,401.3	3,336.4
Accumulated depreciation and amortization	(1,915.0)	(1,867.2)
Total property, plant and equipment, net	1,486.3	$ 1,469.2
Construction in progress	244.9
Capital Expenditures Incurred but Not yet Paid	$ 3.4

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Joint Ventures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		10 Months Ended	42 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2018	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Cash and cash equivalents	$ 472.5		$ 472.5				$ 645.9
Income (loss) from equity investments	0.0	$ (1.9)	0.0	$ (5.6)
Next Gen Alloys LLC
Schedule of Equity Method Investments [Line Items]
Cash and cash equivalents	$ 1.7		$ 1.7
Allegheny & Tsingshan Stainless
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage	50.00%		50.00%
Sales to noncontrolling interests					$ 12.0
Allegheny & Tsingshan Stainless | Employee Severance [Member]
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity investments	$ 0.0	(2.4)	$ 0.0	(2.4)
Allegheny & Tsingshan Stainless | Forecast
Schedule of Equity Method Investments [Line Items]
Sales to noncontrolling interests						$ 17.5
Uniti
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage	50.00%		50.00%
Tsingshan Group | Allegheny & Tsingshan Stainless
Schedule of Equity Method Investments [Line Items]
Due from Affiliates	$ 5.5		$ 5.5
Advanced Alloys & Solutions [Member] | Shanghai STAL Precision Stainless Steel Co Ltd
Schedule of Equity Method Investments [Line Items]
Cash and cash equivalents	47.2		47.2
Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity investments	(0.4)	(4.6)	(0.9)	(8.5)
Due from Affiliates	13.2		13.2				14.0
Advanced Alloys & Solutions [Member] | Uniti
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity investments	0.4	$ 0.3	0.9	$ 0.5
Prepaid expenses and other current assets | Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless
Schedule of Equity Method Investments [Line Items]
Due from Affiliates	0.5		0.5				0.5
Other Noncurrent Assets [Member] | Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless
Schedule of Equity Method Investments [Line Items]
Due from Affiliates	$ 12.7		$ 12.7				$ 13.5
Allegheny Technologies Inc | Next Gen Alloys LLC
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	51.00%		51.00%
Allegheny Technologies Inc | Advanced Alloys & Solutions [Member] | Shanghai STAL Precision Stainless Steel Co Ltd
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage	60.00%		60.00%
China Baowu Steel Group Corporation Limited | Advanced Alloys & Solutions [Member] | China Baowu Steel Group Corporation Limited | Shanghai STAL Precision Stainless Steel Co Ltd
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage by unaffiliated entity	40.00%		40.00%
Tsingshan Group | Tsingshan Group | Allegheny & Tsingshan Stainless
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage by unaffiliated entity	50.00%		50.00%
VSMPO | VSMPO | Uniti
Schedule of Equity Method Investments [Line Items]
Joint venture ownership percentage by unaffiliated entity	50.00%		50.00%

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Supplemental Financial Statement Information - Schedule of Other Income, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Rent and royalty income	$ 0.2	$ 0.2	$ 0.5	$ 0.5
Gains from disposal of property, plant and equipment, net	1.2	0.0	2.4	2.5
Net equity (loss) gain on joint ventures	0.0	(1.9)	0.0	(5.6)
Adjustment to indemnification for conditional ARO costs	0.0	4.3	0.0	4.3
Other Nonoperating Income (Expense), Other	0.0	0.3	0.0	0.3
Other income (expense), net	1.4	0.5	2.9	(0.4)
Gain on the sale of oil and gas rights				2.5
Allegheny & Tsingshan Stainless | Employee Severance [Member]
Other Income and Expenses [Abstract]
Net equity (loss) gain on joint ventures	$ 0.0	$ (2.4)	$ 0.0	$ (2.4)

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Supplemental Financial Statement Information - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($) employee	Jun. 30, 2020 USD ($) employee	Mar. 31, 2020 employee	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ (6.2)	$ 16.7		$ (6.2)	$ 24.7
Number of positions with decreased severance-related reserve | employee	200
Number of positions eliminated | employee		550	90
Restructuring reserve	$ 26.3			26.3		$ 43.4
Facility Idling
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	0.7			0.7
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(6.9)			(6.9)
Other Current Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	18.2			18.2
Other Noncurrent Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 8.1			$ 8.1

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Supplemental Financial Statement Information - Severance and Employee Benefit Costs Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Balance at December 31, 2020			$ 43.4
Payments			(10.2)
Balance at June 30, 2021	$ 26.3		26.3
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	(6.2)	$ 16.7	(6.2)	$ 24.7
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credits)	$ (6.9)		$ (6.9)

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Debt Schedule of Debt (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Jul. 02, 2020	Feb. 15, 2016	Dec. 31, 2013
Debt Instrument [Line Items]
Debt Issuance Costs, Net	$ (14,200,000)	$ (14,500,000)
Total Debt	1,621,500,000	1,567,800,000
Short-term debt and current portion of long-term debt	19,300,000	17,800,000
Long-term debt	1,602,200,000	1,550,000,000.0
Allegheny Technologies 5.875% Notes due 2023 (a)
Debt Instrument [Line Items]
Debt, Gross	$ 500,000,000.0	$ 500,000,000.0
Debt Instrument, Issuer	Allegheny Technologies	Allegheny Technologies
Interest rate	7.875%	7.875%		7.875%	5.875%
Debt Instrument, Maturity Date	Aug. 15, 2023	Aug. 15, 2023
Allegheny Technologies 5.875% Notes due 2027
Debt Instrument [Line Items]
Debt, Gross	$ 350,000,000.0	$ 350,000,000.0
Debt Instrument, Issuer	Allegheny Technologies	Allegheny Technologies
Interest rate	5.875%	5.875%
Debt Instrument, Maturity Date	Dec. 01, 2027	Dec. 01, 2027
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt
Debt Instrument [Line Items]
Debt, Gross	$ 291,400,000	$ 291,400,000
Debt Issuance Costs, Net	(7,400,000)	(8,200,000)
Equity component of convertible debt	$ 0	$ (46,800,000)	$ (51,400,000)
Debt Instrument, Issuer	Allegheny Technologies	Allegheny Technologies
Interest rate	3.50%	3.50%
Debt Instrument, Maturity Date	Jun. 15, 2025	Jun. 15, 2025
Allegheny Technologies 4.75% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Debt, Gross	$ 84,200,000	$ 84,200,000
Debt Instrument, Issuer	Allegheny Technologies	Allegheny Technologies
Interest rate	4.75%	4.75%
Debt Instrument, Maturity Date	Jul. 01, 2022	Jul. 01, 2022
Allegheny Technologies 4.75% Convertible Senior Notes due 2022 | Convertible Debt
Debt Instrument [Line Items]
Debt Issuance Costs, Net	$ (500,000)	$ (700,000)
Allegheny Ludlum 6.95% Debentures due 2025 (b)
Debt Instrument [Line Items]
Debt, Gross	$ 150,000,000.0	$ 150,000,000.0
Debt Instrument, Issuer	Allegheny Ludlum	Allegheny Ludlum
Interest rate	6.95%	6.95%
Debt Instrument, Maturity Date	Dec. 15, 2025	Dec. 15, 2025
2024 Term Loan
Debt Instrument [Line Items]
Debt, Gross	$ 200,000,000	$ 200,000,000.0
Debt Instrument, Issuer	Allegheny Technologies	Allegheny Technologies
Interest rate	4.21%
Debt Instrument, Maturity Date	Sep. 30, 2024	Sep. 30, 2024
Domestic Bank Group $500 million asset-based credit facility
Debt Instrument [Line Items]
Short-term Debt	$ 0	$ 0
Foreign credit facilities
Debt Instrument [Line Items]
Short-term Debt	4,600,000	5,500,000
Finance leases and other
Debt Instrument [Line Items]
Debt, Gross	$ 55,500,000	$ 48,000,000.0

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Debt - Revolving Credit Facility Narrative (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2024	Dec. 31, 2020	Feb. 15, 2016	Dec. 31, 2013
Allegheny Technologies 5.875% Notes due 2023 (a)
Debt Instrument [Line Items]
Outstanding borrowings	$ 500,000,000.0			$ 500,000,000.0
Interest rate	7.875%			7.875%	7.875%	5.875%
Domestic Bank Group $500 million asset-based credit facility
Debt Instrument [Line Items]
Amount utilized to support the issuance of letters of credit	$ 42,800,000
Average borrowings during period	0	$ 58,000,000
Interest rate during period		2.20%
Short-term Debt	0			$ 0
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 500,000,000
Minimum fixed charge coverage ratio allowed in event of default	1.00
Borrowing capacity unavailable due to fixed charge coverage ratio covenant, maximum	$ 87,500,000
Percentage of borrowing capacity unavailable due to fixed charge coverage ratio covenant	12.50%
Borrowing capacity unavailable due to fixed charge coverage ratio covenant, minimum	$ 62,500,000
Minimum required liquidity number of days prior to maturity of Senior Notes	90 days
Debt covenant, undrawn availability requirement, amount	$ 150,000,000
Debt covenant, undrawn availability requirement, percent of total available liquidity	30.00%
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Minimum | LIBOR based borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)	1.25%
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Minimum | Base rate borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)	0.25%
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Maximum | LIBOR based borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)	1.75%
Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility | Maximum | Base rate borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)	0.75%
Domestic Bank Group $500 million asset-based credit facility | Letter of credit sub-facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 200,000,000
2024 Term Loan
Debt Instrument [Line Items]
Outstanding borrowings	200,000,000			200,000,000.0
Minimum prepayment increments allowed	$ 25,000,000
Interest rate	4.21%
2024 Term Loan | Interest Rate Swap
Debt Instrument [Line Items]
Notional amount of derivative	$ 50,000,000
2024 Term Loan | LIBOR based borrowings
Debt Instrument [Line Items]
Variable interest rate (percentage)	2.00%
Allegheny Technologies 4.75% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Outstanding borrowings	$ 84,200,000			$ 84,200,000
Interest rate	4.75%			4.75%
Forecast | Domestic Bank Group $500 million asset-based credit facility | Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, increase to maximum borrowing capacity			$ 200,000,000

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Debt - Convertible Notes Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) tradingDays $ / shares	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 02, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Equity adjustment for adoption	$ 606,100,000	$ 1,842,300,000	$ 606,100,000	$ 1,842,300,000	$ 609,300,000		$ 641,400,000		$ 2,192,600,000	$ 2,193,200,000
Debt issuance costs	14,200,000		14,200,000				14,500,000
Interest expense, net	(23,700,000)	(21,700,000)	(47,100,000)	(43,600,000)
Debt extinguishment charge (See Note 7)	0	(21,500,000)	0	(21,500,000)
Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Equity adjustment for adoption	1,587,500,000	$ 1,617,800,000	1,587,500,000	$ 1,617,800,000	$ 1,580,500,000		1,625,500,000		$ 1,592,100,000	$ 1,618,000,000.0
Additional Paid-in Capital [Member] | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Equity adjustment for adoption						$ (49,800,000)
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt
Debt Instrument [Line Items]
Debt, Gross	$ 291,400,000		$ 291,400,000				$ 291,400,000
Interest rate	3.50%		3.50%				3.50%
Debt instrument, convertible, redemption price as a percent of principal amount			100.00%
Debt instrument, convertible, threshold percentage of stock price trigger			130.00%
Debt instrument, convertible, threshold trading days | tradingDays			20
Debt instrument, convertible, threshold consecutive trading days | tradingDays			30
Debt instrument, convertible, conversion ratio			0.0645745
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares	$ 15.49		$ 15.49
Debt instrument, convertible, number of equity instruments (in shares)			18,800,000
Equity component of convertible debt	$ 0		$ 0				$ 46,800,000	$ 51,400,000
Debt issuance costs	$ 7,400,000		$ 7,400,000				$ 8,200,000
Debt instrument, interest rate, effective percentage	4.20%		4.20%				8.40%
Cap price (in dollars per share) | $ / shares	$ 19.76		$ 19.76
Interest expense, net	$ 2,900,000		$ 5,900,000
Amortization of Debt Issuance Costs	400,000		800,000
Interest Expense, Debt, Excluding Amortization	2,500,000		5,100,000
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Equity adjustment for adoption						$ (45,400,000)
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt | Additional Paid-in Capital [Member]
Debt Instrument [Line Items]
Debt issuance costs							$ 1,600,000
Allegheny Technologies 4.75% Convertible Senior Notes due 2022
Debt Instrument [Line Items]
Debt, Gross	$ 84,200,000		$ 84,200,000				$ 84,200,000
Interest rate	4.75%		4.75%				4.75%
Allegheny Technologies 4.75% Convertible Senior Notes due 2022 | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, convertible, redemption price as a percent of principal amount			100.00%
Debt instrument, convertible, conversion ratio			0.0692042
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares	$ 14.45		$ 14.45
Debt instrument, convertible, number of equity instruments (in shares)			5,800,000
Debt issuance costs	$ 500,000		$ 500,000				$ 700,000
Debt instrument, interest rate, effective percentage	5.40%	5.40%	5.40%	5.40%
Interest expense, net	$ 1,100,000	$ 3,600,000	$ 2,200,000	$ 7,400,000
Amortization of Debt Issuance Costs	100,000	400,000	200,000	800,000
Interest Expense, Debt, Excluding Amortization	$ 1,000,000.0	$ 3,200,000	$ 2,000,000.0	$ 6,600,000
Debt instrument, repurchased face amount							$ 203,200,000

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Derivative Financial Instruments and Hedging (Details) € in Millions, lb in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) lb	Jun. 30, 2020 USD ($)	Jun. 30, 2021 EUR (€)
Derivative Instruments Gain Loss [Line Items]
Percentage of estimated annual nickel requirements			10.00%
Percentage Of Forecasted Natural Gas Usage Hedged for 2021			70.00%
Percentage Of Forecasted Natural Gas Usage Hedged for 2022			25.00%
Net derivatives gain (loss) on hedge transactions	$ 7.0	$ 2.0	$ 7.4	$ (10.3)
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months			5.4
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Net derivatives gain (loss) on hedge transactions	5.1	1.6	5.4	(7.8)
Cost of Sales and Interest Expense [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	1.1	(3.2)	$ 2.4	(4.6)
Nickel
Derivative Instruments Gain Loss [Line Items]
Notional amount of nickel hedge (in pounds of nickel) | lb			5
Interest Rate Swap | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Net derivatives gain (loss) on hedge transactions	(0.3)	(0.3)	$ 0.1	(2.2)
Interest Rate Swap | Interest Expense [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	(0.2)	(0.3)	(0.4)	(0.5)
Nickel and other raw material contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Net derivatives gain (loss) on hedge transactions	3.4	2.0	2.8	(4.2)
Nickel and other raw material contracts | Cost Of Sales | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	1.1	(1.8)	2.6	(2.0)
Natural gas contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Net derivatives gain (loss) on hedge transactions	2.0	(0.1)	2.4	(1.3)
Natural gas contracts | Cost Of Sales | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	0.2	(1.0)	0.2	(2.0)
Foreign exchange contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Net derivatives gain (loss) on hedge transactions	0.0	0.0	0.1	(0.1)
Foreign exchange contracts | Cost Of Sales | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion Net	$ 0.0	$ (0.1)	$ 0.0	$ (0.1)
Designated as Hedging Instrument | Foreign exchange forward | Cash Flow Hedging
Derivative Instruments Gain Loss [Line Items]
Notional amount of derivative | €					€ 0
2024 Term Loan
Derivative Instruments Gain Loss [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.21%		4.21%		4.21%
2024 Term Loan | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Notional amount of derivative	$ 50.0		$ 50.0

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Derivative Financial Instruments and Hedging (Details2) - Designated as Hedging Instrument - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Asset	$ 7.6	$ 4.8
Derivative Fair Value Of Derivative Liability	2.6	4.0
Nickel and other raw material contracts | Prepaid expenses and other current assets
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Asset	3.8	3.7
Nickel and other raw material contracts | Other assets
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Asset	0.8	0.7
Nickel and other raw material contracts | Accrued liabilities
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Liability	0.0	0.1
Interest Rate Swap | Accrued liabilities
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Liability	1.0	1.0
Interest Rate Swap | Other long-term liabilities
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Liability	1.6	2.5
Natural gas contracts | Prepaid expenses and other current assets
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Asset	2.6	0.2
Natural gas contracts | Other assets
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Asset	0.4	0.2
Natural gas contracts | Accrued liabilities
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Liability	0.0	0.3
Natural gas contracts | Other long-term liabilities
Derivatives Fair Value [Line Items]
Derivative Fair Value Of Derivative Liability	$ 0.0	$ 0.1

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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jul. 02, 2020
Carrying Value Reported Amount Fair Value Disclosure
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 472.5	$ 645.9
Derivative financial instruments, Assets	7.6	4.8
Derivative Financial Instruments, liabilities	2.6	4.0
Debt	1,635.7	1,629.1
Estimate Of Fair Value Fair Value Disclosure
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	472.5	645.9
Derivative financial instruments, Assets	7.6	4.8
Derivative Financial Instruments, liabilities	2.6	4.0
Debt	1,930.0	1,847.7
Estimate Of Fair Value Fair Value Disclosure | Fair Value Inputs Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	472.5	645.9
Derivative financial instruments, Assets	0.0	0.0
Derivative Financial Instruments, liabilities	0.0	0.0
Debt	1,669.9	1,594.2
Estimate Of Fair Value Fair Value Disclosure | Fair Value Inputs Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents	0.0	0.0
Derivative financial instruments, Assets	7.6	4.8
Derivative Financial Instruments, liabilities	2.6	4.0
Debt	260.1	253.5
Convertible Debt | Allegheny Technologies 3.5% Convertible Senior Notes due 2025
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Equity component of convertible debt	$ 0.0	$ 46.8	$ 51.4

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Retirement Benefits (Details1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 3.7	$ 3.1	$ 7.5	$ 6.3
Interest cost on benefits earned in prior years	17.1	21.6	34.2	43.1
Expected return on plan assets	(34.1)	(33.6)	(68.2)	(67.2)
Amortization of prior service cost (credit)	0.1	0.2	0.3	0.4
Amortization of net actuarial loss	18.9	18.6	37.8	37.2
Total retirement benefit expense	5.7	9.9	11.6	19.8
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	0.4	0.6	0.7	1.1
Interest cost on benefits earned in prior years	2.1	2.7	4.2	5.4
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost (credit)	(0.6)	(1.0)	(1.3)	(1.9)
Amortization of net actuarial loss	3.3	2.7	6.6	5.4
Total retirement benefit expense	$ 5.2	$ 5.0	$ 10.2	$ 10.0

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Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Investments, Owned, Federal Income Tax Note [Line Items]
Income tax (provision) benefit	$ (4.0)	$ (92.6)	$ (9.5)	$ (103.4)
Effective income tax rate		(28.30%)		(35.30%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 99.0

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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Sales	$ 616.2	$ 770.3	$ 1,308.7	$ 1,725.8
Segment EBITDA	73.2	62.1	147.5	179.8
LIFO and net realizable value reserves	0.0	0.0	0.0	0.0
Corporate expenses	(15.9)	(7.2)	(28.1)	(19.5)
Closed operations and other income (expense)	(3.6)	2.7	(3.1)	(3.6)
Total ATI Adjusted EBITDA	53.7	57.6	116.3	156.7
Depreciation & amortization	(36.3)	(35.6)	(72.4)	(72.9)
Interest expense, net	(23.7)	(21.7)	(47.1)	(43.6)
Restructuring charges (credits)	(6.2)	16.7	(6.2)	24.7
Strike related costs	(40.3)	0.0	(40.3)	0.0
Impairment of goodwill	0.0	(287.0)	0.0	(287.0)
Income (loss) from equity investments	0.0	(1.9)	0.0	(5.6)
Debt extinguishment charge (See Note 7)	0.0	(21.5)	0.0	(21.5)
Gain on asset sales	0.0	0.0	0.0	2.5
Loss before income taxes	(40.4)	(327.3)	(37.3)	(292.9)
Employee Severance [Member]
Segment Reporting Information [Line Items]
Restructuring charges (credits)	(6.9)		(6.9)
Allegheny & Tsingshan Stainless | Employee Severance [Member]
Segment Reporting Information [Line Items]
Income (loss) from equity investments	0.0	(2.4)	0.0	(2.4)
Advanced Alloys & Solutions [Member] | Allegheny & Tsingshan Stainless
Segment Reporting Information [Line Items]
Income (loss) from equity investments	(0.4)	(4.6)	(0.9)	(8.5)
Operating Segments
Segment Reporting Information [Line Items]
Sales	658.1	822.9	1,399.3	1,859.0
Depreciation & amortization	(36.3)	(35.6)	(72.4)	(72.9)
Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	318.7	316.7	583.9	765.2
Segment EBITDA	37.2	28.7	61.8	105.3
Depreciation & amortization	(19.2)	(19.5)	(38.8)	(39.0)
Strike related costs	(2.1)
Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	339.4	506.2	815.4	1,093.8
Segment EBITDA	36.0	33.4	85.7	74.5
Depreciation & amortization	(16.1)	(15.3)	(31.6)	(32.3)
Strike related costs	(38.2)
Operating Segments | Corporate Segment
Segment Reporting Information [Line Items]
Depreciation & amortization	(1.0)	(0.8)	(2.0)	(1.6)
Internal Customers | Operating Segments
Segment Reporting Information [Line Items]
Sales	41.9	52.6	90.6	133.2
Internal Customers | Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	18.1	16.0	42.4	44.2
Internal Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	23.8	36.6	48.2	89.0
External Customers | Operating Segments
Segment Reporting Information [Line Items]
Sales	616.2	770.3	1,308.7	1,725.8
External Customers | Operating Segments | High Performance Materials & Components
Segment Reporting Information [Line Items]
Sales	300.6	300.7	541.5	721.0
External Customers | Operating Segments | Advanced Alloys & Solutions [Member]
Segment Reporting Information [Line Items]
Sales	$ 315.6	$ 469.6	$ 767.2	$ 1,004.8

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Business Segments - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of business segments | segment			2
Strike related costs	$ 40,300,000	$ 0	$ 40,300,000	$ 0
Impairment of goodwill	0	(287,000,000.0)	0	(287,000,000.0)
Debt extinguishment charge (See Note 7)	0	$ (21,500,000)	0	(21,500,000)
Gain on the sale of oil and gas rights				$ 2,500,000
Allegheny Technologies 3.5% Convertible Senior Notes due 2025 | Convertible Debt
Restructuring Cost and Reserve [Line Items]
Debt, Gross	291,400,000		$ 291,400,000		$ 291,400,000
High Performance Materials & Components | Operating Segments
Restructuring Cost and Reserve [Line Items]
Strike related costs	2,100,000
Advanced Alloys & Solutions [Member] | Operating Segments
Restructuring Cost and Reserve [Line Items]
Strike related costs	$ 38,200,000

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Per Share Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss attributable to ATI	$ (49.2)	$ (422.6)	$ (57.1)	$ (401.5)
Net loss attributable to ATI after assumed conversions	$ (49.2)	$ (422.6)	$ (57.1)	$ (401.5)
Denominator for basic net loss per common share – weighted average shares	127.1	126.6	127.0	126.4
Share-based compensation	0.0	0.0	0.0	0.0
Denominator for diluted net loss per common share – adjusted weighted average shares and assumed conversions	127.1	126.6	127.0	126.4
Basic net (loss) income attributable to ATI per common share (in dollars per share)	$ (0.39)	$ (3.34)	$ (0.45)	$ (3.18)
Diluted net (loss) income attributable to ATI per common share (in dollars per share)	$ (0.39)	$ (3.34)	$ (0.45)	$ (3.18)
Antidilutive Securities Excluded from Computation of Earnings Per Share Amount	25.7	20.5	25.7	20.4
Allegheny Technologies 4.75% Convertible Senior Notes due 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Convertible Senior Notes- Effect on numerator	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Convertible Senior Notes- Effect on denominator	0.0	0.0	0.0	0.0
Interest rate	4.75%		4.75%		4.75%
Allegheny Technologies 3.5% Convertible Senior Notes due 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Convertible Senior Notes- Effect on numerator	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Convertible Senior Notes- Effect on denominator	0.0	0.0	0.0	0.0

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (1,208.6)	$ (1,216.6)	$ (1,223.6)	$ (1,201.7)
OCI before reclassifications		10.2	16.3	5.1	(15.7)
Amounts reclassified from AOCI		22.1	27.5	42.2	44.6
Net current-period OCI		32.3	43.8	47.3	28.9
Ending balance		(1,176.3)	(1,172.8)	(1,176.3)	(1,172.8)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		21.8	9.0	21.2	9.8
OCI before reclassifications		1.9	(0.5)	2.5	(1.3)
Amounts reclassified from AOCI		0.0	0.0	0.0	0.0
Net current-period OCI		1.9	(0.5)	2.5	(1.3)
Ending balance		23.7	8.5	23.7	8.5
Post- retirement benefit plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(1,103.4)	(1,067.4)	(1,119.9)	(1,083.1)
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	[1]	16.5	15.6	33.0	31.3
Net current-period OCI		16.5	15.6	33.0	31.3
Ending balance		(1,086.9)	(1,051.8)	(1,086.9)	(1,051.8)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0	0.0
Ending balance		0.0	0.0	0.0	0.0
Currency translation adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(60.9)	(99.2)	(55.5)	(76.6)
OCI before reclassifications		5.1	14.7	(0.3)	(7.9)
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0	0.0
Net current-period OCI		5.1	14.7	(0.3)	(7.9)
Ending balance		(55.8)	(84.5)	(55.8)	(84.5)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		21.8	9.0	21.2	9.8
OCI before reclassifications		1.9	(0.5)	2.5	(1.3)
Amounts reclassified from AOCI	[2]	0.0	0.0	0.0	0.0
Net current-period OCI		1.9	(0.5)	2.5	(1.3)
Ending balance		23.7	8.5	23.7	8.5
Derivatives [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		1.1	(8.5)	2.1	(0.5)
OCI before reclassifications		5.1	1.6	5.4	(7.8)
Amounts reclassified from AOCI	[3]	(1.1)	3.2	(2.4)	4.6
Net current-period OCI		4.0	4.8	3.0	(3.2)
Ending balance		5.1	(3.7)	5.1	(3.7)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0	0.0
Ending balance		0.0	0.0	0.0	0.0
Accumulated Deferred Tax Asset Valuation Allowance [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(45.4)	(41.5)	(50.3)	(41.5)
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI	[4]	6.7	8.7	11.6	8.7
Net current-period OCI		6.7	8.7	11.6	8.7
Ending balance		(38.7)	(32.8)	(38.7)	(32.8)
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance		0.0	0.0	0.0	0.0
OCI before reclassifications		0.0	0.0	0.0	0.0
Amounts reclassified from AOCI		0.0	0.0	0.0	0.0
Net current-period OCI		0.0	0.0	0.0	0.0
Ending balance		$ 0.0	$ 0.0	$ 0.0	$ 0.0

[1] Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 10).

[2] No amounts were reclassified to earnings.

[3] Amounts related to derivatives are included in cost of goods sold or interest expense in the period or periods the hedged item affects earnings (see Note 8).

[4] Represents the net change in deferred tax asset valuation allowances on changes in AOCI balances between the balance sheet dates.

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Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization to net loss of net prior service credits		$ (0.5)	$ (0.8)	$ (1.0)	$ (1.5)
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses		22.2	21.3	44.4	42.6
Loss before income taxes		(40.4)	(327.3)	(37.3)	(292.9)
Income tax provision		4.0	92.6	9.5	103.4
Cost of sales		(573.5)	(695.6)	(1,180.2)	(1,516.3)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post- retirement benefit plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization to net loss of net prior service credits	[1]	0.5	0.8	1.0	1.5
Amount reclassified from AOCI, Postretirement benefit plans, Actuarial losses	[1]	(22.2)	(21.3)	(44.4)	(42.6)
Loss before income taxes	[2]	(21.7)	(20.5)	(43.4)	(41.1)
Income tax provision	[3]	(5.2)	(4.9)	(10.4)	(9.8)
Net income (loss)		(16.5)	(15.6)	(33.0)	(31.3)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes	[2]	1.5	(4.2)	3.2	(6.0)
Income tax provision	[3]	0.4	(1.0)	0.8	(1.4)
Net income (loss)		1.1	(3.2)	2.4	(4.6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Nickel and other raw material contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	[4]	1.4	(2.3)	3.4	(2.6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Natural gas contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	[4]	0.3	(1.3)	0.3	(2.6)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	[4]	0.0	(0.1)	0.0	(0.1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivatives [Member] | Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	[4]	$ (0.2)	$ (0.5)	$ (0.5)	$ (0.7)

[1] Amounts are reported in nonoperating retirement benefit expense (see Note 10).

[2] For pretax items, positive amounts are income and negative amounts are expense in terms of the impact to net income. Tax effects are presented in conformity with ATI’s presentation in the consolidated statements of operations.

[3] These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable.

[4] Amounts related to derivatives, with the exception of the interest rate swap, are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the interest rate swap are included in interest expense in the same period as the interest expense on the Term Loan is recognized in earnings (see Note 8).

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Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2021 USD ($)
Components of Environmental Loss Accrual [Abstract]
Accrual For Environmental Loss Contingencies	$ 13.0
Accrued Environmental Loss Contingencies Current	4.0
Federal Superfund and comparable state-managed sites	3.0
Formerly owned or operated sites	8.0
Owned or controlled sites at which Company operations have been or plan to be discontinued	2.0
Maximum
Loss Contingency, Estimate [Abstract]
Loss contingency maximum possible loss	$ 15.0

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Subsequent Event - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Feb. 28, 2021 employee	Dec. 31, 2020 USD ($)
Subsequent Event [Line Items]
Income tax provision		$ 4.0	$ 92.6	$ 9.5	$ 103.4
Accrued postretirement benefits		317.1		317.1			$ 326.7
Entity number of employees covered by USW Collective Bargaining Agreements that expired February 28 2021 | employee						1,100
Other Postretirement Benefit Plan, Defined Benefit | Collective-Bargaining Arrangement, Other
Subsequent Event [Line Items]
Accrued postretirement benefits		43.0		43.0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		$ (22.0)		$ (22.0)
Forecast | Collective-Bargaining Arrangement, Other
Subsequent Event [Line Items]
Income tax provision	$ 15.0
Forecast | Other Postretirement Benefit Plan, Defined Benefit | Collective-Bargaining Arrangement, Other
Subsequent Event [Line Items]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	$ 65.0