Revenue Recognition - Product Vertcal (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Product Revenue [Abstract]
Fastening Systems	24.10%	24.60%	24.00%	24.50%
Fluid Power	15.10%	14.60%	15.20%	14.70%
Specialty Chemicals	11.70%	12.60%	13.10%	13.50%
Cutting Tools and Abrasives	13.10%	13.70%	11.60%	12.30%
Electrical	10.40%	10.60%	10.80%	10.90%
Aftermarket Automotive Supplies	7.60%	7.60%	7.90%	8.00%
Safety	4.70%	4.60%	4.70%	4.60%
Welding and Metal Repair	1.30%	1.70%	1.50%	1.90%
Other Products	12.00%	10.00%	11.20%	9.60%
Total Products	100.00%	100.00%	100.00%	100.00%