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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Accumulated Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent [Abstract] |  |  |  |
Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax | $ (10.1) |  | $ 3.4 |
OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 2.6 |  | (10.9) |
OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxAttributableToParent | 2.6 |  | (10.9) |
Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax | (7.5) |  | (7.5) |
Accumulated Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent [Abstract] |  |  |  |
Defined Benefit Plan Accumulated Other Comprehensive Income Net Of Tax Effect | (1,011.8) |  | (1,030.0) |
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax | 0 |  | 0 |
Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax | (18.3) | (16.6) | (36.5) | (33.3)
OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent | 18.3 |  | 36.5 |
Defined Benefit Plan Accumulated Other Comprehensive Income Net Of Tax Effect | (993.5) |  | (993.5) |
Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax [Abstract] |  |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | 0 |  | (0.1) |
OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (0.1) |  | 0 |
OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax | 0 |  | 0 |
OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | (0.1) |  | 0 |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (0.1) |  | (0.1) |
Aoci Derivative Financial Instruments [Abstract] |  |  |  |
Aoci Derivative Financial Instruments | 5.7 |  | (2.7) |
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | (9.8) |  | (1.8) |
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax | 0.4 |  | 0.8 |
OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent | (9.4) |  | (1.0) |
Aoci Derivative Financial Instruments | (3.7) |  | (3.7) |
Accumulated Other Comprehensive Income Loss Attributable To Ati [Abstract] |  |  |  |
Accumulated Other Comprehensive Income Loss Attributable to ATI, Total | (1,016.2) |  | (1,029.4) |
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 11.4 |  | 24.6 |
Other Comprehensive Income Loss Reclassification Adjustments Net Of Tax Portion Attributable To Parent | 18.7 |  | 37.3 |
Other Comprehensive Income Loss Before Reclassification Adjustments Net Of Tax Attributable To Parent | (7.3) |  | (12.7) |
Accumulated Other Comprehensive Income Loss Attributable to ATI, Total | (1,004.8) |  | (1,004.8) |
Noncontrolling Interest Items Abstract |  |  |  |
Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Attributable To Noncontrolling Interests Net of Tax | 24.2 |  | 23.7 |
OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTaxAttributableToNoncontrollingInterest | 1.9 |  | 2.4 |
OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest | 1.9 |  | 2.4 |
Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Attributable To Noncontrolling Interests Net of Tax | $ 26.1 |  | $ 26.1 |

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