XML 64 R54.htm IDEA: XBRL DOCUMENT
v3.21.2

Derivative Financial Instruments and Hedging (Details) € in Millions, lb in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) lb | Sep. 30, 2020 USD ($) | Sep. 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 |  |  | 80.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2022 |  |  | 75.00% |  |
Percentage Of Forecasted Natural Gas Usage Hedged for 2023 |  |  | 35.00% |  |
Percentage of Forecasted Natural Gas Usage Hedged for 2024 |  |  | 5.00% |  |
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract] |  |  |  |  |
Cash Flow Hedge Gain (Loss) To Be Reclassified Within Twelve Months |  |  | $ 8.6 |  |
Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivative gain (loss) on hedge transactions | $ 5.2 | $ 4.7 | 10.6 | $ (3.1) |
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 | 2.3 | (0.3) | $ 4.7 | (4.9) |
Nickel |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Notional amount of nickel hedge (in pounds of nickel) | lb |  |  | 4 |  |
Interest Rate Swap | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivative gain (loss) on hedge transactions | (0.2) | 0.1 | $ (0.1) | (2.1) |
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) | (0.2) | (0.6) | (0.7) |
Nickel and other raw material contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivative gain (loss) on hedge transactions | (0.2) | 2.1 | 2.6 | (2.1) |
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 | 1.5 | 0.7 | 4.1 | (1.3) |
Natural gas contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivative gain (loss) on hedge transactions | 5.6 | 2.5 | 8.0 | 1.2 |
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 | 1.0 | (0.8) | 1.2 | (2.8) |
Foreign exchange contracts | Other Comprehensive Income (Loss) [Member] | Cash Flow Hedging |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |
Net derivative 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 | $ 0.0 | $ 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 |  |

X
- Definition Percentage Of Forecasted Natural Gas Usage Hedged for Year 3 + References No definition available. + Details
Name: | ati_PercentageOfForecastedNaturalGasUsageHedgedForYear3
Namespace Prefix: | ati_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Forecasted Natural Gas Usage Hedged for Year 1 + References No definition available. + Details
Name: | ati_PercentageOfForecastedNaturalGasUsageHedgedforYear1
Namespace Prefix: | ati_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in percentage of estimated annual domestic (U.S.) usage + References No definition available. + Details
Name: | ati_PercentageOfForecastedNaturalGasUsageHedgedforYear2
Namespace Prefix: | ati_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Forecasted Natural Gas Usage Hedged for Year 4 + References No definition available. + Details
Name: | ati_PercentageOfForecastedNaturalGasUsageYear4
Namespace Prefix: | ati_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in percentage of annual estimated usage in production + References No definition available. + Details
Name: | ati_PercentageOfRawMaterialUsageHedged
Namespace Prefix: | ati_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountMass
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReclassificationOfCashFlowHedgeGainLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherComprehensiveIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ati_CostofSalesandInterestExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ati_NickelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_InterestExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ati_NickelAndOtherRawMaterialContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=ati_NaturalGasContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ati_A2024TermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |