Restructuring and Other Expense - Components of Restructuring and Other Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Expense:
Severance and related	$ 0.1	$ 0.3	$ 0.1	$ 0.9
Other	0.0	(0.9)	0.0	(0.9)
Total Restructuring	0.1	(0.6)	0.1	0.0
Other Expense:
Other	0.0	0.0	0.0	(0.1)
Total Other	0.0	0.0	0.0	(0.1)
Total Restructuring and Other	$ 0.1	(0.6)	$ 0.1	$ (0.1)
Consulting credits		$ 0.1