Revenue

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue

Note 2. Revenue

Disaggregation of Revenue

The accounting policies of the operations in the various geographic areas are the same as those described in the summary of significant accounting policies. Revenues are attributed to countries based on the location of the branch from which the sale occurred. In each of the years presented in the tables below, no single customer represented 5% or more of our consolidated net sales.

Our revenues related to the following geographic areas were as follows for the periods ended December 31:

	Twelve-month period
	2018		2017	2016
United States	$	4,285.5	3,842.9	3,493.5
All foreign countries	679.6		547.6	468.5
Total revenues	$	4,965.1	4,390.5	3,962.0

The percentages of our sales by end market were as follows for the periods ended December 31:

	Twelve-month period
	2018		2017		2016
Manufacturing	66.7	%	66.5	%	65.9	%
Non-residential construction	13.1	%	13.0	%	13.6	%
Other	20.2	%	20.5	%	20.5	%
	100.0	%	100.0	%	100.0	%

The percentages of our sales by product line were as follows for the periods ended December 31⁽¹⁾:

		Twelve-month Period
Type	Introduced	2018		2017		2016
Fasteners(2)	1967	34.9	%	35.6	%	36.6	%
Tools	1993	10.0	%	10.1	%	9.9	%
Cutting tools	1996	5.7	%	5.8	%	5.7	%
Hydraulics & pneumatics	1996	6.8	%	6.8	%	6.9	%
Material handling	1996	5.8	%	5.9	%	6.0	%
Janitorial supplies	1996	7.6	%	7.3	%	7.3	%
Electrical supplies	1997	4.7	%	4.9	%	4.8	%
Welding supplies	1997	4.1	%	4.2	%	4.2	%
Safety supplies	1999	17.2	%	16.3	%	16.0	%
Other		3.2	%	3.1	%	2.6	%
		100.0	%	100.0	%	100.0	%

⁽¹⁾ In 2018, we reclassified certain product category designations and have conformed the prior period percentages to the current year presentation.

⁽²⁾ The fastener product line represents fasteners and miscellaneous supplies.