Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Contract Liabilities

Significant changes in these contract liability balances were as follows for the periods ended March 31:

	Three-month Period
	2018			2017
Outstanding at beginning of period	$	31.3		24.9
Increase (decrease) attributed to:
Sales incentive accruals	11.9			9.1
Contract payments	(9.6		)	(7.1	)
Outstanding at end of period	$	33.6		26.9

Disaggregation of Revenue

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

	Three-month Period
	2018		2017
United States	$	1,028.5	922.3
Canada	72.6		59.6
Other foreign countries	84.7		65.8
Total revenues	$	1,185.8	1,047.7

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

	Three-month Period
	2018		2017
Manufacturing	67.7	%	67.0	%
Non-Residential construction	12.7	%	13.1	%
Other	19.6	%	19.9	%
	100.0	%	100.0	%

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

		Three-month Period
Type	Introduced	2018		2017
Fasteners(2)	1967	35.0	%	35.6	%
Tools	1993	10.2	%	10.2	%
Cutting tools	1996	5.7	%	5.9	%
Hydraulics & pneumatics	1996	7.0	%	6.9	%
Material handling	1996	5.8	%	6.1	%
Janitorial supplies	1996	7.4	%	7.3	%
Electrical supplies	1997	4.8	%	4.7	%
Welding supplies	1997	4.2	%	4.3	%
Safety supplies(3)	1999	16.8	%	16.0	%
Other		3.1	%	3.0	%
		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⁾ Fastener product line represents fasteners and miscellaneous supplies.

⁽³⁾ The safety supplies product line has expanded as a percentage of sales in the last several years due to our industrial vending program.