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Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
TableTextBlockSupplementAbstract  
ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
  Post-Currency Unrealized    
  retirementtranslationholding gains    
  benefit plansadjustmenton securitiesDerivativesTotal
Attributable to ATI:        
            
Balance, March 31, 2013$ (1,011.8)$ (10.1)$ -$ 5.7$ (1,016.2)
OCI before reclassifications  -  2.6  (0.1)  (9.8)  (7.3)
Amounts reclassified from AOCI(a) 18.3(b) -(b) -(c) 0.4  18.7
Net current-period OCI  18.3  2.6  (0.1)  (9.4)  11.4
Balance, June 30, 2013$ (993.5)$ (7.5)$ (0.1)$ (3.7)$ (1,004.8)
            
Attributable to noncontrolling interests:        
            
Balance, March 31, 2013$ -$ 24.2$ -$ -$ 24.2
OCI before reclassifications  -  1.9  -  -  1.9
Net current-period OCI  -  1.9  -  -  1.9
Balance, June 30, 2013$ -$ 26.1$ -$ -$ 26.1
            
The changes in accumulated other comprehensive income (loss) (AOCI) by component, net of tax, for the six month
period ended June 30, 2013 were as follows:
            
  Post-Currency Unrealized    
  retirementtranslationholding gains    
  benefit plansadjustmenton securitiesDerivativesTotal
Attributable to ATI:        
            
Balance, December 31, 2012$ (1,030.0)$ 3.4$ (0.1)$ (2.7)$ (1,029.4)
OCI before reclassifications  -  (10.9)  -  (1.8)  (12.7)
Amounts reclassified from AOCI(a) 36.5(b) -(b) -(c) 0.8  37.3
Net current-period OCI  36.5  (10.9)  -  (1.0)  24.6
Balance, June 30, 2013$ (993.5)$ (7.5)$ (0.1)$ (3.7)$ (1,004.8)
            
Attributable to noncontrolling interests:        
            
Balance, December 31, 2012$ -$ 23.7$ -$ -$ 23.7
OCI before reclassifications  -  2.4  -  -  2.4
Amounts reclassified from AOCI  -(b) -  -  -  -
Net current-period OCI  -  2.4  -  -  2.4
Balance, June 30, 2013$ -$ 26.1$ -$ -$ 26.1

   Amount reclassified from AOCI (c)  
Details about AOCI Components (in millions) Three Months Ended June 30, 2013   Six Months Ended June 30, 2013 Affected line item in the income statement
Postretirement benefit plans$   $   
 Prior service (cost) credit  3.8(a)   7.6(a) 
 Actuarial losses  (33.5)(a)   (67.0)(a) 
     (29.7)(c)   (59.4)(c)Total before tax
     (11.4)    (22.9) Tax provision (benefit)
   $ (18.3)  $ (36.5) Net of tax
           
Derivatives        
 Nickel and other raw material contracts$ (1.6)(b) $ (1.5)(b) 
 Natural gas contracts  0.2(b)   (1.5)(b) 
 Electricity contracts  -(b)   (0.3)(b) 
 Foreign exchange contracts  0.9(b)   2.1(b) 
     (0.5)(c)   (1.2)(c)Total before tax
     (0.1)    (0.4) Tax provision (benefit)
   $ (0.4)  $ (0.8) Net of tax