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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ (98.1) $ 12.6
Currency translation adjustment    
Unrealized net change arising during the period (5.4) (21.8)
Derivatives    
Net derivatives gain (loss) on hedge transactions (9.2) 18.5
Reclassification to net income (loss) of net realized loss (gain) 5.0 (2.7)
Income taxes on derivative transactions (1.6) 6.1
Total (2.6) 9.7
Postretirement benefit plans    
Amortization of net actuarial loss 18.7 18.7
Net gain arising during period 22.5 0.0
Amortization to net income (loss) of net prior service cost 0.9 1.5
Income taxes on postretirement benefit plans 16.0 7.7
Total 26.1 12.5
Other comprehensive income, net of tax 18.1 0.4
Comprehensive income (loss) (80.0) 13.0
Less: Comprehensive income attributable to noncontrolling interests 1.6 2.4
Comprehensive income (loss) attributable to ATI $ (81.6) $ 10.6