Revenue Disaggregation of Revenue (Details) - Revenue from Contract with Customer [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total net sales	100.00%	100.00%
Construction
Disaggregation of Revenue [Line Items]
Total net sales	59.60%	59.60%
Industrial & Utility
Disaggregation of Revenue [Line Items]
Total net sales	21.30%	21.70%
CIG
Disaggregation of Revenue [Line Items]
Total net sales	19.10%	18.70%