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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |
Net loss | $ (527.2) | $ (141.3) | $ (640.8) | $ (142.6)
Currency translation adjustment |  |  |  |
Unrealized net change arising during the period | (4.4) | (16.2) | (19.6) | (18.7)
Unrealized holding gain on securities |  |  |  |
Net loss arising during the period | 0.0 | 0.0 | 0.0 | (0.1)
Derivatives |  |  |  |
Net derivatives gain (loss) on hedge transactions | 4.8 | (26.8) | 21.9 | (18.7)
Reclassification to net income (loss) of net realized loss (gain) | 0.6 | (3.3) | 8.5 | (8.1)
Income taxes on derivative transactions | 2.0 | (11.6) | 11.5 | (10.3)
Total | 3.4 | (18.5) | 18.9 | (16.5)
Postretirement benefit plans |  |  |  |
Amortization of net actuarial loss | 18.7 | 18.8 | 56.2 | 56.2
Net gain arising during period | 0.0 | 0.0 | 22.5 | 0.0
Amortization to net income (loss) of net prior service cost (credit) | (0.4) | 1.5 | 0.0 | 4.5
Income taxes on postretirement benefit plans | 6.9 | 7.8 | 29.8 | 23.2
Total | 11.4 | 12.5 | 48.9 | 37.5
Other comprehensive income (loss), net of tax | 10.4 | (22.2) | 48.2 | 2.2
Comprehensive loss | (516.8) | (163.5) | (592.6) | (140.4)
Less: Comprehensive income (loss) attributable to noncontrolling interests | 2.0 | (0.8) | 5.4 | 4.6
Comprehensive loss attributable to ATI | $ (518.8) | $ (162.7) | $ (598.0) | $ (145.0)

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