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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