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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 21.1 $ (98.1)
Currency translation adjustment    
Unrealized net change arising during the period 10.4 (5.4)
Derivatives    
Net derivatives loss on hedge transactions (2.6) (9.2)
Reclassification to net income (loss) of net realized loss (gain) (0.9) 5.0
Income taxes on derivative transactions 0.0 (1.6)
Total (3.5) (2.6)
Postretirement benefit plans    
Amortization of net actuarial loss 17.8 18.7
Net gain arising during period 0.0 22.5
Amortization to net income (loss) of net prior service cost (credits) (0.4) 0.9
Income taxes on postretirement benefit plans 0.0 16.0
Total 17.4 26.1
Other comprehensive income, net of tax 24.3 18.1
Comprehensive income (loss) 45.4 (80.0)
Less: Comprehensive income attributable to noncontrolling interests 5.6 1.6
Comprehensive income (loss) attributable to ATI $ 39.8 $ (81.6)