CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Comprehensive income (loss):
Net income (loss)	$ (20.3)	$ 20.8	$ (1.2)	$ 12.8
Other comprehensive income before income tax effect:
Net loss on foreign currency cash flow hedges reclassified as income	0.0	0.0	(0.2)	(0.1)
Defined benefit plans and other postretirement benefits:
Amortization of prior service benefit during the period	(1.8)	(0.7)	(5.0)	(1.7)
Amortization of net loss during the period	2.3	2.1	9.4	4.9
Other comprehensive income before income tax effect	0.5	1.4	4.2	3.1
Income tax effect	(0.4)	(0.4)	(1.1)	(1.2)
Other comprehensive income	0.1	1.0	3.1	1.9
Total comprehensive income (loss)	$ (20.2)	$ 21.8	$ 1.9	$ 14.7