Restructuring and Other Expense - Components of Restructuring and Other Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Expense:
Severance and related	$ 0.0	$ 0.6
Total Restructuring	0.0	0.6
Other Expense:
Other	0.0	(0.1)
Total Other	0.0	(0.1)
Total Restructuring and Other	$ 0.0	0.5
Consulting credits		$ 0.1