XML 55 R41.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Supplemental Financial Statement Information (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Additional Financial Information Disclosure [Abstract] |
Schedule of cash and cash equivalents | Cash and cash equivalents at December 31, 2021 and 2020 were as follows:
(In millions) |  | 2021 |  | 2020
Cash |  | $ | 222.8 |  |  | $ | 158.2 |
Other short-term investments |  | 464.9 |  |  | 487.7 |
Total cash and cash equivalents |  | $ | 687.7 |  |  | $ | 645.9 |
Schedule of other non-operating income (expense) | Other income (expense) for the years ended December 31, 2021, 2020, and 2019 was as follows:
(in millions) |  | 2021 |  | 2020 |  | 2019*
Rent, royalty income and other income |  | $ | 1.1 |  |  | $ | 0.9 |  |  | $ | 2.9 |
Gains from disposal of property, plant and equipment, net |  | 2.9 |  |  | 2.9 |  |  | 90.7 |
Net equity income (loss) on joint ventures (See Note 7) |  | 0.1 |  |  | (7.0) |  |  | (10.7) |
Gain (loss) on sales of businesses, net (See Note 6) |  | 13.8 |  |  | — |  |  | (7.1) |
Joint venture restructuring and impairment charges (See Note 7) |  | — |  |  | (2.4) |  |  | (11.4) |
Adjustment to indemnification for conditional ARO costs (See Note 8) |  | — |  |  | 4.3 |  |  | — |
Other |  | 0.3 |  |  | 0.1 |  |  | — |
Total other income (expense), net |  | $ | 18.2 |  |  | $ | (1.2) |  |  | $ | 64.4 |
* The year ended December 31, 2019 reflects impacts from the change in inventory accounting method, as described in Note 1 of the Notes to the Consolidated Financial Statements.

X
- Definition Disclosures of supplemental information, including descriptions and amounts, related to the balance sheet, income statement, and/or cash flow statement + References No definition available. + Details
Name: | ati_AdditionalFinancialInformationDisclosureAbstract
Namespace Prefix: | ati_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
Name: | us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration