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STATEMENTS OF CHANGES IN CONSOLIDATED EQUITY (USD $) In Millions, unless otherwise specified | Total | [CommonStockMember] | [AdditionalPaidInCapitalMember] | [RetainedEarningsMember] | [TreasuryStockMember] | [AccumulatedOtherComprehensiveIncomeMember] | [NoncontrollingInterestMember]
--- | --- | --- | --- | --- | --- | --- | ---
Total Stockholders' Equity at Dec. 31, 2013 | $ 2,994.7 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 11.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,185.9 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 2,490.1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (79.6)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (713.2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 100.5 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | (17.9)us-gaap_ProfitLoss |  |  | (20.0)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 2.1 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income (loss) | 17.1 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  | 18.9 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (1.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Cash dividends on common stock ($0.18 per share) | (19.3)us-gaap_DividendsCommonStockCash |  |  | (19.3)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Employee stock plans | (7.5)ati_EmployeeStockPlans |  | (25.7)ati_EmployeeStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (10.1)ati_EmployeeStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 28.3 ati_EmployeeStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Total Stockholders' Equity at Mar. 31, 2014 | 2,967.1 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 11.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,160.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 2,440.7 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (51.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (694.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 100.8 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Total Stockholders' Equity at Dec. 31, 2014 | 2,709.3 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 11.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,164.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 2,398.9 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (44.3)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (931.4)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 110.9 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 12.6 us-gaap_ProfitLoss |  |  | 10.0 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 2.6 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Other comprehensive income (loss) | 0.4 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  | 0.6 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (0.2)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Cash dividends on common stock ($0.18 per share) | (19.3)us-gaap_DividendsCommonStockCash |  |  | (19.3)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  |
Redeemable noncontrolling interest | 0 us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease |  |  | (0.1)us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 0.1 us-gaap_TemporaryEquityIssuePeriodIncreaseOrDecrease / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee stock plans | 5.0 ati_EmployeeStockPlans |  | (10.0)ati_EmployeeStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (7.1)ati_EmployeeStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 22.1 ati_EmployeeStockPlans / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |
Total Stockholders' Equity at Mar. 31, 2015 | $ 2,708.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 11.0 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,154.2 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 2,382.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (22.2)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (930.8)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 113.4 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember

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