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Schedule of Income Tax Provision (Benefit) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Components Of Income Tax Expense Benefit Continuing Operations Abstract | |||
| Current: Federal | $ (47.9)us-gaap_CurrentFederalTaxExpenseBenefit | $ (127.5)us-gaap_CurrentFederalTaxExpenseBenefit | $ 82.3us-gaap_CurrentFederalTaxExpenseBenefit |
| Current: State | (4.0)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (10.2)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 8.7us-gaap_CurrentStateAndLocalTaxExpenseBenefit |
| Current: Foreign | 9.8us-gaap_CurrentForeignTaxExpenseBenefit | 7.9us-gaap_CurrentForeignTaxExpenseBenefit | 9.0us-gaap_CurrentForeignTaxExpenseBenefit |
| Total Current | (42.1)us-gaap_CurrentIncomeTaxExpenseBenefit | (129.8)us-gaap_CurrentIncomeTaxExpenseBenefit | 100.0us-gaap_CurrentIncomeTaxExpenseBenefit |
| Deferred: Federal | 34.1us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 62.7us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (27.6)us-gaap_DeferredFederalIncomeTaxExpenseBenefit |
| Deferred: State | (0.2)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 4.6us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 0.1us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit |
| Deferred: Foreign | (0.5)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (1.1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (0.1)us-gaap_DeferredForeignIncomeTaxExpenseBenefit |
| Total Deferred | 33.4us-gaap_DeferredIncomeTaxExpenseBenefit | 66.2us-gaap_DeferredIncomeTaxExpenseBenefit | (27.6)us-gaap_DeferredIncomeTaxExpenseBenefit |
| Income tax provision (benefit) from continuing operations | (8.7)us-gaap_IncomeTaxExpenseBenefit | (63.6)us-gaap_IncomeTaxExpenseBenefit | 72.4us-gaap_IncomeTaxExpenseBenefit |
| Income tax provision (benefit) from discontinued operations | (0.3)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 161.4us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 3.8us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |
| Total company income tax provision (benefit) | $ (9.0)ati_IncomeTaxExpenseBenefitNet | $ 97.8ati_IncomeTaxExpenseBenefitNet | $ 76.2ati_IncomeTaxExpenseBenefitNet |
| X | ||||||||||
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- Definition
Income Tax Expense (Benefit), Net No definition available.
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- Details
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| X | ||||||||||
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- Definition
Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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