Acquisitions	12 Months Ended
Dec. 31, 2016
Business Combinations [Abstract]
Acquisitions	Acquisitions The Company acquired several companies for approximately $420,000,000, $140,000,000, and $270,000,000, net of cash acquired, during the years ended December 31, 2016, 2015, and 2014, respectively. These acquisitions are considered individually immaterial, as well as immaterial in the aggregate. 2016 A significant portion of the acquisitions made in 2016 included eleven companies in the Automotive Parts Group, five companies in the Industrial Group, two companies in the Office Products Group, and one company in the Electrical/Electronic Materials Group. The purchase price for these nineteen acquisitions was approximately $370,000,000, net of cash acquired. Automotive Parts Group The eleven Automotive Parts Group acquisitions generate annual revenues of approximately $235,000,000. In February and July, 2016, the Company acquired two import automotive parts businesses, Olympus and Auto-Camping, respectively. Olympus operates six locations in the U.S. and Auto-Camping operates twenty locations in Canada. In March 2016, the Company acquired Covs Parts, a distributor of original equipment and aftermarket automotive parts, mining and industrial consumable and truck products, with twenty-one locations across Western Australia. In May 2016, the Company acquired Global Parts with six U.S. heavy vehicle parts locations. The Company acquired AMX, an aftermarket motorcycle parts retailer, and ASL, an automotive aftermarket parts distributor, in June and September 2016, respectively. AMX operates four stores in Australia and ASL operates 15 branches in New Zealand. The Company also acquired various automotive store groups in the U.S. and Australasia regions in 2016. Industrial Group The five Industrial Group acquisitions generate annual revenues of approximately $170,000,000. In March 2016, the Company acquired two industrial distribution companies, Epperson and Company and Missouri Power Transmission, with three and fifteen locations, respectively. In April 2016, the Company acquired Colmar Belting Company, a distributor of belting, bearing and power transmission products. In August 2016, the Company acquired OBBCO, a distributor of industrial safety supplies. In October 2016, the Company acquired Braas Company, a distributor of products and services for industrial automation and control, with eight locations. Office Products Group The two Office Products Group acquisitions generate annual revenues of approximately $200,000,000. In June 2016, the Company acquired The Safety Zone, a direct importer and distributor of supplies and devices for safety, janitorial, medical, food service and food processing application. The Safety Zone has eight distribution centers in the U.S. and one distribution center in Canada. In July 2016, the Company acquired certain assets within the janitorial and sanitation business of Rochester Midland Corporation. Electrical/Electronic Materials Group The Electrical/Electronic Materials Group acquisition generates annual revenues of approximately $12,000,000. In October 2016, the Company acquired Communications Products and Services, a distributor of plant product solutions. Net sales from these nineteen acquisitions included in the Company's consolidated statement of income and comprehensive income at December 31, 2016 were approximately $350,000,000. 2015 and 2014 A significant portion of the 2015 companies acquired included one company in the Electrical/Electronic Materials Group, three companies in the Office Products Group, four companies in the Industrial Group, and five store groups in the Automotive Parts Group for approximately $120,000,000, net of cash acquired. A significant portion of the 2014 companies acquired included two companies each in the Automotive Parts Group, Office Products Group, and Electrical/Electronic Materials Group and one company in the Industrial Group for approximately $260,000,000, net of cash acquired. For each acquisition, the Company allocated the purchase price to the assets acquired and the liabilities assumed based on their fair values as of their respective acquisition dates. The results of operations for the acquired companies were included in the Company’s consolidated statements of income and comprehensive income beginning on their respective acquisition dates. The Company recorded approximately $260,000,000, $90,000,000 and $200,000,000 of goodwill and other intangible assets associated with the 2016, 2015, and 2014 acquisitions, respectively. For the 2016 acquisitions, other intangible assets acquired consisted of customer relationships of $112,000,000 and trademarks of $28,000,000 with weighted average amortization lives of 17 and 35 years, respectively. For the 2015 acquisitions, other intangible assets acquired consisted of customer relationships of $39,000,000 with weighted average amortization lives of 15 years. For the 2014 acquisitions, other intangible assets acquired consisted of customer relationships of $82,000,000 and trademarks of $28,000,000 with weighted average amortization lives of 18 and 40 years, respectively.

Acquisitions

The Company acquired several companies for approximately $420,000,000, $140,000,000, and $270,000,000, net of cash acquired, during the years ended December 31, 2016, 2015, and 2014, respectively. These acquisitions are considered individually immaterial, as well as immaterial in the aggregate.

2016

A significant portion of the acquisitions made in 2016 included eleven companies in the Automotive Parts Group, five companies in the Industrial Group, two companies in the Office Products Group, and one company in the Electrical/Electronic Materials Group. The purchase price for these nineteen acquisitions was approximately $370,000,000, net of cash acquired.

Automotive Parts Group

The eleven Automotive Parts Group acquisitions generate annual revenues of approximately $235,000,000. In February and July, 2016, the Company acquired two import automotive parts businesses, Olympus and Auto-Camping, respectively. Olympus operates six locations in the U.S. and Auto-Camping operates twenty locations in Canada. In March 2016, the Company acquired Covs Parts, a distributor of original equipment and aftermarket automotive parts, mining and industrial consumable and truck products, with twenty-one locations across Western Australia. In May 2016, the Company acquired Global Parts with six U.S. heavy vehicle parts locations. The Company acquired AMX, an aftermarket motorcycle parts retailer, and ASL, an automotive aftermarket parts distributor, in June and September 2016, respectively. AMX operates four stores in Australia and ASL operates 15 branches in New Zealand. The Company also acquired various automotive store groups in the U.S. and Australasia regions in 2016.

Industrial Group

The five Industrial Group acquisitions generate annual revenues of approximately $170,000,000. In March 2016, the Company acquired two industrial distribution companies, Epperson and Company and Missouri Power Transmission, with three and fifteen locations, respectively. In April 2016, the Company acquired Colmar Belting Company, a distributor of belting, bearing and power transmission products. In August 2016, the Company acquired OBBCO, a distributor of industrial safety supplies. In October 2016, the Company acquired Braas Company, a distributor of products and services for industrial automation and control, with eight locations.

Office Products Group

The two Office Products Group acquisitions generate annual revenues of approximately $200,000,000. In June 2016, the Company acquired The Safety Zone, a direct importer and distributor of supplies and devices for safety, janitorial, medical, food service and food processing application. The Safety Zone has eight distribution centers in the U.S. and one distribution center in Canada. In July 2016, the Company acquired certain assets within the janitorial and sanitation business of Rochester Midland Corporation.

Electrical/Electronic Materials Group

The Electrical/Electronic Materials Group acquisition generates annual revenues of approximately $12,000,000. In October 2016, the Company acquired Communications Products and Services, a distributor of plant product solutions.

Net sales from these nineteen acquisitions included in the Company's consolidated statement of income and comprehensive income at December 31, 2016 were approximately $350,000,000.

2015 and 2014

A significant portion of the 2015 companies acquired included one company in the Electrical/Electronic Materials Group, three companies in the Office Products Group, four companies in the Industrial Group, and five store groups in the Automotive Parts Group for approximately $120,000,000, net of cash acquired. A significant portion of the 2014 companies acquired included two companies each in the Automotive Parts Group, Office Products Group, and Electrical/Electronic Materials Group and one company in the Industrial Group for approximately $260,000,000, net of cash acquired.

For each acquisition, the Company allocated the purchase price to the assets acquired and the liabilities assumed based on their fair values as of their respective acquisition dates. The results of operations for the acquired companies were included in the Company’s consolidated statements of income and comprehensive income beginning on their respective acquisition dates. The Company recorded approximately $260,000,000, $90,000,000 and $200,000,000 of goodwill and other intangible assets associated with the 2016, 2015, and 2014 acquisitions, respectively.

For the 2016 acquisitions, other intangible assets acquired consisted of customer relationships of $112,000,000 and trademarks of $28,000,000 with weighted average amortization lives of 17 and 35 years, respectively. For the 2015 acquisitions, other intangible assets acquired consisted of customer relationships of $39,000,000 with weighted average amortization lives of 15 years. For the 2014 acquisitions, other intangible assets acquired consisted of customer relationships of $82,000,000 and trademarks of $28,000,000 with weighted average amortization lives of 18 and 40 years, respectively.