Business Segments - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2015 customer	Dec. 31, 2014 customer	Dec. 31, 2015 customer segment	Dec. 31, 2014	Jun. 30, 2015 customer
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Customer Concentration Risk | Net Sales
Concentration Risk [Line Items]
Number of significant customers		0
Customer Concentration Risk | Net Sales | Alcoa
Concentration Risk [Line Items]
Number of significant customers	1		1	0
Concentration risk		14.00%	14.00%
Customer Concentration Risk | Accounts Receivable | Alcoa
Concentration Risk [Line Items]
Number of significant customers			1		1
Concentration risk			15.00%		17.00%