Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

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.