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Derivative Financial Instruments and Hedging - Narrative (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Maturity Dates Through 2018 [Member] EUR (€)	Dec. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] Maturity Dates Through 2015 [Member] EUR (€)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Percentage of estimated annual nickel requirements	15.00%ati_PercentageOfRawMaterialUsageHedged
Maximum amount of time hedged for nickel requirements	2020
Percentage of forecasted natural gas usage hedged for 2015	80.00%ati_PercentageOfForecastedNaturalGasUsageHedgedforYear1
Percentage of forecasted natural gas usage hedged for 2016	70.00%ati_PercentageOfForecastedNaturalGasUsageHedgedforYear2
Percentage of forecasted natural gas usage hedged for 2017	40.00%ati_PercentageOfForecastedNaturalGasUsageHedgedforYear3
Derivative [Line Items]
Derivative notional amount		€ 388invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / ati_DerivativeMaturityRangeAxis = ati_MaturityDatesThrough2018Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	€ 175invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / ati_DerivativeMaturityRangeAxis = ati_MaturityDatesThrough2015Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Cash flow hedge gain (loss) to be reclassified within twelve months	$ 5.3us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

X

- Definition

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments

+ References

No definition available.

+ Details

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Namespace Prefix:	ati_
Data Type:	xbrli:gYearItemType
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_PercentageOfForecastedNaturalGasUsageHedgedforYear1
Namespace Prefix:	ati_
Data Type:	num: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

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Namespace Prefix:	ati_
Data Type:	num: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_PercentageOfForecastedNaturalGasUsageHedgedforYear3
Namespace Prefix:	ati_
Data Type:	num: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:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

+ Details

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- Details

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