XML 125 R111.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Business Segments (Details3) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Identifiable Assets | $ 5,170.0 | $ 5,751.7 | $ 6,571.7
Deferred taxes | 681.7 | 722.8 |
High Performance Materials & Components [Member] |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Identifiable Assets | 2,744.3 | 3,355.5 | 3,555.8
Flat Rolled Products [Member] |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Identifiable Assets | 2,056.4 | 2,189.5 | 2,601.6
Discontinued Operations [Member] |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Identifiable Assets | 0.4 | 0.9 | 1.8
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Deferred taxes | 12.1 | 0.0 | 0.0
Corporate: Cash and cash equivalents and other [Member] |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Identifiable Assets | $ 356.8 | $ 205.8 | $ 412.5

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_SegmentReportingAssetReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ati_HighPerformanceMaterialsComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ati_FlatRolledProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_SegmentDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ati_CashAndCashEquivalentsAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |