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Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets    
Pensions $ 251.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions $ 115.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Postretirement benefits other than pensions 169.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 182.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Federal and state net operating loss tax carryovers 122.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 32.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Federal and state tax credits 53.6us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 42.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred compensation and other benefit plans 25.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 29.4us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther
Self insurance reserves 10.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 10.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Other items 79.1us-gaap_DeferredTaxAssetsOther 79.5us-gaap_DeferredTaxAssetsOther
Gross deferred income tax assets 711.9us-gaap_DeferredTaxAssetsGross 491.8us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets (34.4)us-gaap_DeferredTaxAssetsValuationAllowance (33.9)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred income tax assets 677.5us-gaap_DeferredTaxAssetsNet 457.9us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities    
Bases of property, plant and equipment 579.5us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 488.1us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Inventory valuation 111.7ati_DeferredTaxLiabilitiesInventory 66.5ati_DeferredTaxLiabilitiesInventory
Bases of amortizable intangible assets 75.5us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets 67.1us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Other items 53.9us-gaap_DeferredTaxLiabilitiesOther 46.3us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 820.6us-gaap_DeferredTaxLiabilities 668.0us-gaap_DeferredTaxLiabilities
Net deferred tax liability $ (143.1)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (210.1)us-gaap_DeferredTaxAssetsLiabilitiesNet