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Revenue Recognition - Product Vertcal (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Product Revenue [Abstract]        
Fastening Systems 24.30% 24.60% 23.90% 24.40%
Fluid Power 15.20% 14.80% 15.20% 14.70%
Specialty Chemicals 11.70% 12.30% 13.10% 13.40%
Cutting Tools and Abrasives 13.00% 13.40% 11.50% 12.30%
Electrical 10.70% 10.80% 11.10% 11.00%
Aftermarket Automotive Supplies 7.60% 7.80% 8.00% 8.20%
Safety 4.70% 4.70% 4.70% 4.70%
Welding and Metal Repair 1.60% 2.10% 1.70% 2.00%
Other Products 11.20% 9.50% 10.80% 9.30%
Total Products 100.00% 100.00% 100.00% 100.00%