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Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
plan
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2015
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]        
Preferred stock, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued    
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]        
Number of share-based compensation plans 2ati_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofPlans      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted (shares) 675,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 576,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 394,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Common stock shares available for future awards 1,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Shares vested 18,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod 333,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod 343,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Nonvested beginning of the year (shares) 927,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 727,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 677,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Granted (shares) 675,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 576,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 394,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Vested (shares) (18,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod (333,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod (343,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod  
Forfeited (shares) (208,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod (43,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod (1,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod  
Nonvested end of the year (shares) 1,376,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 927,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 727,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Beginning balance (in dollars per share) $ 36.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 38.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 36.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Granted (in dollars per share) $ 20.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 16.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 16.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Vested (in dollars per share) $ (1.0)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue $ (16.4)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue $ (14.1)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue  
Forfeited (in dollars per share) $ (8.4)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue $ (1.7)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue $ (0.1)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue  
Ending balance (in dollars per share) $ 47.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 36.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 38.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Retained Earnings Note Disclosure [Abstract]        
Undistributed earnings of investees accounted for under equity method $ 12ati_RetainedEarningsEquityMethodUndistributedEarnings      
Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Income target attainment measurement period 3 years      
Share based compensation expense 2.4us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
11.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
14.0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Unrecognized compensation expense 18.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unrecognized compensation expense 10.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
TSR/TSRP Minimum Shares 0ati_TsrpMinimumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
TSR/TSRP Target Shares 789,000ati_TsrpTargetShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
TSR/TSRP Maximum Shares 1,580,000ati_TsrpMaximumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
PRSP 2014 [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted (shares) 492,773us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ati_PRSP2014Member
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (shares) 492,773us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ati_PRSP2014Member
     
LTSV 2014 [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted (shares) 113,827us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ati_LongTermShareholderValueLTSV2014Member
     
Award vesting period 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Granted (shares) 113,827us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ati_LongTermShareholderValueLTSV2014Member
     
PRSP 2012 [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Forfeited (shares) (171,083)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ati_PRSP2012Member
     
TSRP 2012-2014 [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
TSR/TSRP Award Fair Value 8.8ati_TsrpAwardFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
     
Unrecognized compensation expense 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
     
TSR/TSRP Minimum Shares 0ati_TsrpMinimumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
     
TSR/TSRP Target Shares 186,000ati_TsrpTargetShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
     
TSR/TSRP Maximum Shares 373,000ati_TsrpMaximumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
     
TSRP 2013-2015 [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
TSR/TSRP Award Fair Value 11.0ati_TsrpAwardFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRP20132015MemberMember
     
Unrecognized compensation expense 3.7us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRP20132015MemberMember
     
TSR/TSRP Minimum Shares 0ati_TsrpMinimumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRP20132015MemberMember
     
TSR/TSRP Target Shares 309,000ati_TsrpTargetShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRP20132015MemberMember
     
TSR/TSRP Maximum Shares 618,000ati_TsrpMaximumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRP20132015MemberMember
     
TSR 2014-2016 [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Target share award level 319,955ati_TargetShareAwardLevel
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSR20142016Member
     
TSR/TSRP Award Fair Value 9.9ati_TsrpAwardFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSR20142016Member
     
Unrecognized compensation expense 6.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSR20142016Member
     
TSR/TSRP Minimum Shares 0ati_TsrpMinimumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSR20142016Member
     
TSR/TSRP Target Shares 294,000ati_TsrpTargetShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSR20142016Member
     
TSR/TSRP Maximum Shares 589,000ati_TsrpMaximumShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSR20142016Member
     
TSR and TSRP Awards [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Share based compensation expense $ 9.8us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRandTSRPAwardsMember
$ 12.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRandTSRPAwardsMember
$ 19.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRandTSRPAwardsMember
 
Performance measurement period 3 years      
Common stock shares available for future awards 1,850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRandTSRPAwardsMember
     
Maximum [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period 5 years      
Maximum [Member] | PRSP 2013 [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period 5 years      
Maximum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award multiplier 2ati_ShareBasedCompensationArrangementbySharebasedPaymentAwardAwardMultiplier
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRandTSRPAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Minimum [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period 3 years      
Minimum [Member] | PRSP 2014 [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period 3 years      
Minimum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award multiplier 0ati_ShareBasedCompensationArrangementbySharebasedPaymentAwardAwardMultiplier
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_TSRandTSRPAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Subsequent Event [Member] | TSRP 2012-2014 [Member] | Performance Awards [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares vested       137,843us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Vested (shares)       (137,843)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= ati_Tsrp20122014Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember