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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Components of Environmental Loss Accrual [Abstract]
Accrual For Environmental Loss Contingencies	$ 17us-gaap_AccrualForEnvironmentalLossContingencies
Accrued Environmental Loss Contingencies Current	9us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Federal Superfund and comparable state-managed sites	5ati_EnvironmentalRemediationObligationFederalSuperfundSites
Formerly owned or operated sites	10ati_EnvironmentalRemediationObligationForFormerlyOwnedSites
Owned or controlled sites at which Company operations have been discontinued	1ati_EnvironmentalRemediationObligationForOwnedOrControlledSitesWithClosedOperations
Sites utilized by the company in its ongoing operations	1ati_EnvironmentalRemediationObligationsForOngoingOperations
Loss Contingency, Estimate [Abstract]
Loss contingency maximum possible loss	$ 19us-gaap_LossContingencyRangeOfPossibleLossMaximum

X

- Definition

Recorded amount of the accrual for a material component of an environmental loss contingency related to Federal Superfund and comparable state-managed sites

+ References

No definition available.

+ Details

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Namespace Prefix:	ati_
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Balance Type:	credit
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X

- Definition

Recorded amount of the accrual for a material component of an environmental loss contingency related to formerly owned or operated sites

+ References

No definition available.

+ Details

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Namespace Prefix:	ati_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Recorded amount of the accrual for a material component of an environmental loss contingency related to owned or controlled sites at which company operations have been discontinued

+ References

No definition available.

+ Details

Name:	ati_EnvironmentalRemediationObligationForOwnedOrControlledSitesWithClosedOperations
Namespace Prefix:	ati_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Recorded amount of the accrual for a material component of an environmental loss contingency related to sites utilized by the company in its ongoing operations

+ References

No definition available.

+ Details

Name:	ati_EnvironmentalRemediationObligationsForOngoingOperations
Namespace Prefix:	ati_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 10

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6911-107765

+ Details

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- Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Details

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

X

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

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