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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 60.5 | $ 21.1
Currency translation adjustment |  |
Unrealized net change arising during the period | 23.6 | 10.4
Derivatives |  |
Net derivatives gain (loss) on hedge transactions | 3.3 | (2.6)
Reclassification to net income of net realized gain | (3.0) | (0.9)
Income taxes on derivative transactions | 0.0 | 0.0
Total | 0.3 | (3.5)
Postretirement benefit plans |  |
Amortization of net actuarial loss | 19.2 | 17.8
Amortization to net income of net prior service credits | (0.6) | (0.4)
Income taxes on postretirement benefit plans | 0.0 | 0.0
Total | 18.6 | 17.4
Other comprehensive income, net of tax | 42.5 | 24.3
Comprehensive income | 103.0 | 45.4
Less: Comprehensive income attributable to noncontrolling interests | 9.4 | 5.6
Comprehensive income attributable to ATI | $ 93.6 | $ 39.8

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