XML 49 R35.htm IDEA: XBRL DOCUMENT v2.4.1.9

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

X

- 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

Name:	us-gaap_DeferredFinanceCostsNoncurrentNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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