Restructuring - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Remaining provision	$ 2.1
Employee Separation, Facility and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	1.6
Utilized funds	(0.9)
Employee Separation, Facility and Other Costs | Monona Facility
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	1.0
Employee Severance and Facility and Other Costs | Shadyside Stamping
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	0.6
Employee Costs
Restructuring Cost and Reserve [Line Items]
Utilized funds	$ (0.9)