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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income (loss) $ (14.6) $ (15.4)
Amortization of prior service costs (credits) (0.1) (0.1)
Other comprehensive income (loss), before tax (0.1) (0.1)
Income tax expense related to items of other comprehensive income 0.0 0.0
Other comprehensive income (loss), net of tax (0.1) (0.1)
Comprehensive income (loss) $ (14.7) $ (15.5)