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Accounting Policies (Accounting Pronouncements) (Details) (Accounting Standard Update 2015-03, USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Accounting Standard Update 2015-03 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Debt issuance costs to be reclassified | $ 10.6 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = ati_AccountingStandardUpdate201503Member | $ 10.9 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = ati_AccountingStandardUpdate201503Member

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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration