Condensed 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
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6.9	$ 8.0	$ 3.9	$ (4.9)
Net pension adjustments, net of tax:
Liability adjustments for defined benefit pension plans	0.0	0.8	0.0	0.8
Reclassification of adjustment for defined benefit plans recorded in net loss	0.1	0.9	0.3	1.1
Total net pension adjustments	0.1	0.1	0.3	0.3
Net foreign currency translation:
Unrealized foreign currency translation gains (losses)	0.9	0.1	0.7	0.1
Total net foreign currency translation	0.9	0.1	0.7	0.1
Total other comprehensive income (loss), net of tax	1.0	0.2	1.0	0.4
Comprehensive income (loss)	$ 7.9	$ 8.2	$ 4.9	$ (4.5)