CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$ 238.0	$ 269.5
Accounts receivable, net of allowances for doubtful accounts of $4.8 as of March 31, 2015 and December 31, 2014	690.9us-gaap_AccountsReceivableNetCurrent	603.6us-gaap_AccountsReceivableNetCurrent
Inventories, net	1,472.6us-gaap_InventoryNet	1,472.8us-gaap_InventoryNet
Prepaid expenses and other current assets	64.1us-gaap_OtherAssetsCurrent	136.2us-gaap_OtherAssetsCurrent
Total current assets	2,465.6us-gaap_AssetsCurrent	2,482.1us-gaap_AssetsCurrent
Property, plant and equipment, net	2,943.7us-gaap_PropertyPlantAndEquipmentNet	2,961.8us-gaap_PropertyPlantAndEquipmentNet
Cost in excess of net assets acquired	777.9us-gaap_Goodwill	780.4us-gaap_Goodwill
Other assets	369.6us-gaap_OtherAssetsNoncurrent	358.3us-gaap_OtherAssetsNoncurrent
Total assets	6,556.8us-gaap_Assets	6,582.6us-gaap_Assets
Current Liabilities:
Accounts payable	559.5us-gaap_AccountsPayableCurrent	556.7us-gaap_AccountsPayableCurrent
Accrued liabilities	288.8us-gaap_AccruedLiabilitiesCurrent	323.2us-gaap_AccruedLiabilitiesCurrent
Deferred income taxes	70.8us-gaap_DeferredTaxLiabilitiesCurrent	62.2us-gaap_DeferredTaxLiabilitiesCurrent
Short-term debt and current portion of long-term debt	17.9us-gaap_DebtCurrent	17.8us-gaap_DebtCurrent
Total current liabilities	937.0us-gaap_LiabilitiesCurrent	959.9us-gaap_LiabilitiesCurrent
Long-term debt	1,509.1	1,509.1
Accrued postretirement benefits	407.1	415.8
Pension liabilities	730.2	739.3
Deferred income taxes	91.3	80.9
Other long-term liabilities	162.0us-gaap_OtherLiabilitiesNoncurrent	156.2us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	3,836.7us-gaap_Liabilities	3,861.2us-gaap_Liabilities
Redeemable noncontrolling interest	12.1	12.1
ATI Stockholders' Equity:
Preferred stock, par value $0.10: authorized-50,000,000 shares; issued-none	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock, par value $0.10: authorized-500,000,000 shares; issued-109,695,171 shares at March 31, 2015 and December 31, 2014; outstanding- 109,172,045 shares at March 31, 2015 and 108,710,914 shares at December 31, 2014	11.0us-gaap_CommonStockValue	11.0us-gaap_CommonStockValue
Additional paid-in capital	1,154.2	1,164.2
Retained earnings	2,382.4	2,398.9
Treasury stock: 523,126 shares at March 31, 2015 and 984,257 shares at December 31, 2014	(22.2)us-gaap_TreasuryStockValue	(44.3)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss, net of tax	(930.8)	(931.4)
Total ATI stockholders’ equity	2,594.6us-gaap_StockholdersEquity	2,598.4us-gaap_StockholdersEquity
Noncontrolling interests
Noncontrolling interests	113.4us-gaap_MinorityInterest	110.9us-gaap_MinorityInterest
Total Equity	2,708.0	2,709.3
Total Liabilities and Equity	$ 6,556.8	$ 6,582.6

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 4.E)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section E

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29-31)

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683

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-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 50

-Paragraph 4

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