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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Net income (loss) | $ (104.1) | $ 12.2
Amortization of prior service costs (credits) | (0.2) | (0.1)
Other comprehensive income (loss), before tax | (0.2) | (0.1)
Income tax expense related to items of other comprehensive income | 0.0 | 0.0
Other comprehensive income (loss), net of tax | (0.2) | (0.1)
Comprehensive income (loss) | $ (104.3) | $ 12.1

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