Segments (Percentage of Net Sales by Product Line) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product Information [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%
Supply Technologies
Product Information [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%
Supply Technologies | Supply Technologies
Product Information [Line Items]
Percentage of net sales	87.00%	85.00%	85.00%
Supply Technologies | Engineered specialty products
Product Information [Line Items]
Percentage of net sales	13.00%	15.00%	15.00%
Assembly Components
Product Information [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%
Assembly Components | Fuel-related, rubber and plastic products
Product Information [Line Items]
Percentage of net sales	66.00%	70.00%	67.00%
Assembly Components | Aluminum products
Product Information [Line Items]
Percentage of net sales	34.00%	30.00%	33.00%
Engineered Products
Product Information [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%
Engineered Products | Industrial equipment business
Product Information [Line Items]
Percentage of net sales	70.00%	84.00%	79.00%
Engineered Products | Forged and machined products
Product Information [Line Items]
Percentage of net sales	30.00%	16.00%	21.00%