Restructuring and Other Expense - Components of Restructuring and Other Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Expense:
Severance and related	$ 0.0	$ 0.1	$ 0.1	$ 0.7
Other	0.0	(0.8)	0.0	(1.4)
Total Restructuring	0.0	(0.7)	0.1	(0.7)
Other Expense:
Pension settlement/curtailment (Note 9)	0.0	0.8	0.0	0.8
Other	0.0	0.0	0.0	(0.1)
Total Other	0.0	0.8	0.0	0.7
Total Restructuring and Other	$ 0.0	$ 0.1	$ 0.1	0.0
Consulting credits				$ 0.1