Subsequent Event - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 26, 2018	Apr. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Subsequent Event
Subsequent Event [Line Items]
Restructuring charges	$ 2.0
Severance and retention expenses	0.8
Restructuring costs	$ 1.2
Property plant and equipment, held for sale		$ 0.5
Arizona
Subsequent Event [Line Items]
Restructuring charges			$ 0.4	$ 0.7
Arizona | Subsequent Event
Subsequent Event [Line Items]
Sales price		$ 1.1
Forecast
Subsequent Event [Line Items]
Expected cost to be paid					$ 0.5	$ 1.5
Estimated capital expenditures					$ 1.4	$ 1.2