10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

ý Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended September 30, 2017, or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from __________ to __________                   

Commission file number 0-16125

FASTENAL COMPANY

(Exact name of registrant as specified in its charter)

Minnesota	41-0948415
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

2001 Theurer Boulevard Winona, Minnesota	55987-1500
(Address of principal executive offices)	(Zip Code)

(507) 454-5374

(Registrant's telephone number, including area code)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files.)    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definition of “large accelerated filer”, “accelerated filer”, “smaller reporting company", and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	ý	Accelerated Filer	¨
Non-accelerated Filer	¨  (Do not check if a smaller reporting company)	Smaller Reporting Company	¨
		Emerging Growth Company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the last practicable date.

Class	Outstanding at October 10, 2017
Common Stock, par value $.01 per share	287,390,374

FASTENAL COMPANY

INDEX

	Page No.
Part I Financial Information:
Condensed Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016	1
Condensed Consolidated Statements of Earnings for the nine months and three months ended September 30, 2017 and 2016	2
Condensed Consolidated Statements of Comprehensive Income for the nine months and three months ended September 30, 2017 and 2016	3
Condensed Consolidated Statements of Cash Flows for the nine months ended September 30, 2017 and 2016	4
Notes to Condensed Consolidated Financial Statements	5
Management's Discussion and Analysis of Financial Condition and Results of Operations	11
Quantitative and Qualitative Disclosures About Market Risks	18
Controls and Procedures	18
Part II Other Information:
Legal Proceedings	18
Risk Factors	18
Unregistered Sales of Equity Securities and Use of Proceeds	19
Exhibits	19

PART I — FINANCIAL INFORMATION

ITEM 1 — FINANCIAL STATEMENTS

FASTENAL COMPANY AND SUBSIDIARIES

Condensed Consolidated Balance Sheets

(Amounts in millions except share and per share information)

	(Unaudited)
Assets	September 30, 2017			December 31, 2016
Current assets:
Cash and cash equivalents	$	133.4		112.7
Trade accounts receivable, net of allowance for doubtful accounts of $11.4 and $11.2, respectively	632.1			499.7
Inventories	1,047.0			993.0
Prepaid income taxes	—			12.9
Other current assets	117.7			102.5
Total current assets	1,930.2			1,720.8
Property and equipment, net	889.3			899.7
Other assets	82.1			48.4
Total assets	$	2,901.6		2,668.9
Liabilities and Stockholders' Equity
Current liabilities:
Current portion of debt	$	8.0		10.5
Accounts payable	147.1			108.8
Accrued expenses	198.7			156.4
Income taxes payable	6.6			—
Total current liabilities	360.4			275.7
Long-term debt	432.0			379.5
Deferred income tax liabilities	82.9			80.6
Stockholders' equity:
Preferred stock: $0.01 par value, 5,000,000 shares authorized, no shares issued or outstanding	—			—
Common stock: $0.01 par value, 400,000,000 shares authorized, 287,383,174 and 289,161,924 shares issued and outstanding, respectively	2.9			2.9
Additional paid-in capital	1.3			37.4
Retained earnings	2,050.2			1,940.1
Accumulated other comprehensive loss	(28.1		)	(47.3	)
Total stockholders' equity	2,026.3			1,933.1
Total liabilities and stockholders' equity	$	2,901.6		2,668.9

See accompanying Notes to Condensed Consolidated Financial Statements.

1

FASTENAL COMPANY AND SUBSIDIARIES

Condensed Consolidated Statements of Earnings

(Amounts in millions except earnings per share)

	(Unaudited)					(Unaudited)
	Nine Months Ended September 30,					Three Months Ended September 30,
	2017			2016		2017			2016
Net sales	$	3,302.0		3,014.1		$	1,132.8		1,013.1
Cost of sales	1,669.6			1,521.2		576.9			513.3
Gross profit	1,632.4			1,492.9		555.9			499.8
Operating and administrative expenses	955.0			879.9		327.5			297.1
Gain on sale of property and equipment	(1.1		)	(0.3	)	(0.1		)	(0.2	)
Operating income	678.5			613.3		228.5			202.9
Interest income	0.3			0.3		0.1			0.1
Interest expense	(6.5		)	(4.7	)	(2.6		)	(1.8	)
Earnings before income taxes	672.3			608.9		226.0			201.2
Income tax expense	246.1			224.3		82.9			74.3
Net earnings	$	426.2		384.6		$	143.1		126.9
Basic net earnings per share	$	1.48		1.33		$	0.50		0.44
Diluted net earnings per share	$	1.48		1.33		$	0.50		0.44
Basic weighted average shares outstanding	288.5			288.9		287.5			289.0
Diluted weighted average shares outstanding	288.6			289.1		287.6			289.1

See accompanying Notes to Condensed Consolidated Financial Statements.

2

FASTENAL COMPANY AND SUBSIDIARIES

Condensed Consolidated Statements of Comprehensive Income

(Amounts in millions)

	(Unaudited)			(Unaudited)
	Nine Months Ended September 30,			Three Months Ended September 30,
	2017		2016	2017		2016
Net earnings	$	426.2	384.6	$	143.1	126.9
Other comprehensive income, net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2017 and 2016)	19.2		9.3	8.2		(2.9	)
Comprehensive income	$	445.4	393.9	$	151.3	124.0

See accompanying Notes to Condensed Consolidated Financial Statements.

3

FASTENAL COMPANY AND SUBSIDIARIES

Condensed Consolidated Statements of Cash Flows

(Amounts in millions)

	(Unaudited)
	Nine Months Ended September 30,
	2017			2016
Cash flows from operating activities:
Net earnings	$	426.2		384.6
Adjustments to reconcile net earnings to net cash provided by operating activities, net of acquisition:
Depreciation of property and equipment	92.3			74.5
Gain on sale of property and equipment	(1.1		)	(0.3	)
Bad debt expense	6.2			6.6
Deferred income taxes	2.3			2.7
Stock-based compensation	4.0			2.9
Amortization of intangible assets	2.8			0.4
Changes in operating assets and liabilities, net of acquisition:
Trade accounts receivable	(126.2		)	(80.4	)
Inventories	(31.2		)	(51.0	)
Other current assets	(15.2		)	11.6
Accounts payable	35.9			(8.2	)
Accrued expenses	42.3			3.8
Income taxes	19.5			39.8
Other	(1.9		)	(0.1	)
Net cash provided by operating activities	455.9			386.9
Cash flows from investing activities:
Purchases of property and equipment	(82.7		)	(162.0	)
Proceeds from sale of property and equipment	6.2			4.6
Cash paid for acquisition	(58.7		)	—
Other	(3.0		)	(0.2	)
Net cash used in investing activities	(138.2		)	(157.6	)
Cash flows from financing activities:
Proceeds from debt obligations	805.0			760.0
Payments against debt obligations	(750.0		)	(680.0	)
Proceeds from exercise of stock options	3.5			25.0
Purchases of common stock	(82.6		)	(59.5	)
Payments of dividends	(277.1		)	(259.9	)
Net cash used in financing activities	(301.2		)	(214.4	)
Effect of exchange rate changes on cash and cash equivalents	4.2			3.1
Net increase in cash and cash equivalents	20.7			18.0
Cash and cash equivalents at beginning of period	112.7			129.0
Cash and cash equivalents at end of period	$	133.4		147.0
Supplemental disclosure of cash flow information:
Cash paid for interest	$	6.1		4.4
Net cash paid for income taxes	$	223.8		181.2

See accompanying Notes to Condensed Consolidated Financial Statements.

4

FASTENAL COMPANY AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Amounts in millions except share and per share information and where otherwise noted)

September 30, 2017 and 2016

(Unaudited)

(1) Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of Fastenal Company and subsidiaries (collectively referred to as the Company, Fastenal, or by terms such as we, our, or us) have been prepared in accordance with U.S. generally accepted accounting principles ('GAAP') for interim financial information. They do not include all information and footnotes required by U.S. GAAP for complete financial statements. However, except as described herein, there has been no material change in the information disclosed in the Notes to Consolidated Financial Statements included in our consolidated financial statements as of and for the year ended December 31, 2016. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

Recently Adopted Accounting Pronouncements

Effective January 1, 2017, we adopted the Financial Accounting Standards Board ('FASB') Accounting Standards Update ('ASU') 2016-09, Improvements to Employee Share-Based Payment Accounting. The standard simplifies several aspects of the accounting for employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding requirements, as well as classification in the Condensed Consolidated Statements of Cash Flows. As a result of the adoption, on a prospective basis, for the nine and three month periods ended September 30, 2017, we recognized $0.5 and $0.0,respectively, of excess tax benefits from stock-based compensation as a discrete item in our income tax expense. Historically, these amounts were recorded as additional paid-in capital. Upon adoption, we elected to apply the change retrospectively to our Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2016, which resulted in a reclassification of excess tax benefits from stock-based compensation of $5.5 offsetting cash flows used in financing activities to cash flows provided by operating activities. We elected not to change our policy on accounting for forfeitures and will continue to estimate a requisite forfeiture rate. Additional amendments to the accounting for income taxes and minimum statutory withholding requirements had no impact on our results of operations.

Recently Issued Accounting Pronouncements

In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU 2014-09 for all entities by one year. This update is effective for public business entities for annual reporting periods beginning after December 15, 2017, including interim periods within those reporting periods. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. ASU 2014-09 was to become effective for us beginning January 2017; however, ASU 2015-14 defers our effective date until January 2018, which is when we plan to adopt this standard. The ASU permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The ASU also requires expanded disclosures relating to the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required for customer contracts, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. While we are still in the process of evaluating the effect of adoption on our consolidated financial statements and are currently assessing our contracts with customers, we do not currently expect a material impact on our results of operations, cash flows or financial position. The majority of our revenue arrangements generally consist of a single performance obligation to transfer promised goods or services. We anticipate we will expand our consolidated financial statement disclosures in order to comply with the ASU. We have not yet decided on our transition method upon adoption, but plan to select a transition method in the fourth quarter of 2017.

In February 2016, the FASB issued ASU 2016-02, Leases, which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The update is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those reporting periods, with early adoption permitted. The guidance will be applied on a modified retrospective basis with the earliest period presented. Based on the effective date, this guidance will apply beginning January 2019, which is when we plan to adopt this ASU. While we are still in the process of evaluating the effect of adoption on our consolidated financial statements and are currently assessing our leases, we expect the adoption will lead to a material increase in the assets and liabilities recorded on our Condensed Consolidated Balance Sheets. As part of our assessment, we will need to determine the impact of lease extension provisions provided in our facility and vehicle leases, which will impact the amount of the right of use asset and lease liability recorded under the ASU.

5

FASTENAL COMPANY AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Amounts in millions except share and per share information and where otherwise noted)

September 30, 2017 and 2016

(Unaudited)

(2) Acquisition

On March 31, 2017, we acquired certain assets and assumed certain liabilities of Manufacturers Supply Company (‘Mansco’). Mansco, based in Hudsonville, Michigan, is a distributor of industrial and fastener supplies with a particularly strong market position with commercial furniture original equipment manufacturers. As such, this acquisition gives us a presence in a market where we have not meaningfully contributed in the past, while providing Mansco with additional tools with which to service its customer base and reduce costs through economies of scale.

The total purchase price for this acquisition consisted of $57.9 paid in cash at closing, $0.8 paid in cash after closing pursuant to a post-closing purchase price adjustment, and a contingent consideration arrangement which requires us to pay the former owner up to a maximum of $2.5 (undiscounted) in cash after closing based on sales growth of the acquired business. The fair value of the contingent consideration arrangement as of September 30, 2017, estimated by applying the income approach, which is a Level 3 measurement under the fair value hierarchy, was $0.6. Assuming payment of $0.6 of the contingent consideration arrangement, the total consideration for the acquisition will be $59.3. We funded the purchase price for the acquisition with the proceeds from the issuance during the first quarter of 2017 of a new series of senior unsecured promissory notes under our master note agreement in the aggregate principal amount of $60.0.

The fair value of the assets acquired and liabilities assumed is summarized below.

Current assets	$	21.7
Property and equipment	0.9
Identifiable intangible assets	20.1
Current liabilities	(1.8		)
Total identifiable net assets	40.9
Goodwill	18.4
Total fair value of assets acquired and liabilities assumed	$	59.3

The identifiable intangible assets consist mainly of the value of the customer relationships that were acquired and the goodwill consists largely of the synergies and economies of scale expected from combining the Mansco operations with our existing operations. The identifiable intangible assets and goodwill are deductible for income tax purposes.

The amount of net sales and net earnings of the acquired business included in our condensed consolidated statement of earnings for the periods ended September 30, 2017, and the pro forma net sales and net earnings of the combined entity had the acquisition occurred on January 1, 2016, are:

	Nine-month Period			Three-month Period
	2017		2016	2017		2016
Net sales	$	40.4	36.7	$	13.4	12.7
Net earnings	$	4.6	3.7	$	1.4	1.2

6

FASTENAL COMPANY AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Amounts in millions except share and per share information and where otherwise noted)

September 30, 2017 and 2016

(Unaudited)

(3) Stockholders' Equity

Dividends

On October 10, 2017, our board of directors declared a dividend of $0.32 per share of common stock. This dividend is to be paid in cash on November 22, 2017 to shareholders of record at the close of business on October 25, 2017. Since 2011, we have paid quarterly dividends. Our board of directors expects to continue paying quarterly dividends, provided the future determination as to payment of dividends will depend on the financial needs of the Company and such other factors as deemed relevant by the board of directors.

The following table presents the dividends either paid previously or declared by our board of directors for future payment on a per share basis:

	2017		2016
First quarter	$	0.32	0.30
Second quarter	0.32		0.30
Third quarter	0.32		0.30
Fourth quarter	0.32		0.30
Total	$	1.28	1.20

Stock Options

The following tables summarize the details of options granted under our stock option plan that were still outstanding as of September 30, 2017, and the assumptions used to value these grants. All such grants were effective at the close of business on the date of grant.

	Options Granted	Option Exercise (Strike) Price		Closing Stock Price on Date of Grant		September 30, 2017
Date of Grant						Options Outstanding	Options Exercisable
January 3, 2017	764,789	$	47.00	$	46.95	725,542	—
April 19, 2016	845,440	$	46.00	$	45.74	757,522	—
April 21, 2015	893,220	$	42.00	$	41.26	700,746	—
April 22, 2014	955,000	$	56.00	$	50.53	572,500	116,250
April 16, 2013	205,000	$	54.00	$	49.25	104,250	57,250
April 17, 2012	1,235,000	$	54.00	$	49.01	957,938	776,103
April 19, 2011	410,000	$	35.00	$	31.78	72,550	47,550
April 20, 2010	530,000	$	30.00	$	27.13	107,800	82,800
April 21, 2009	790,000	$	27.00	$	17.61	221,650	221,650
Total	6,628,449					4,220,498	1,301,603

7

FASTENAL COMPANY AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Amounts in millions except share and per share information and where otherwise noted)

September 30, 2017 and 2016

(Unaudited)

Date of Grant	Risk-free Interest Rate		Expected Life of Option in Years	Expected Dividend Yield		Expected Stock Volatility		Estimated Fair Value of Stock Option
January 3, 2017	1.9	%	5.00	2.6	%	24.49	%	$	8.40
April 19, 2016	1.3	%	5.00	2.6	%	26.34	%	$	8.18
April 21, 2015	1.3	%	5.00	2.7	%	26.84	%	$	7.35
April 22, 2014	1.8	%	5.00	2.0	%	28.55	%	$	9.57
April 16, 2013	0.7	%	5.00	1.6	%	37.42	%	$	12.66
April 17, 2012	0.9	%	5.00	1.4	%	39.25	%	$	13.69
April 19, 2011	2.1	%	5.00	1.6	%	39.33	%	$	11.20
April 20, 2010	2.6	%	5.00	1.5	%	39.10	%	$	8.14
April 21, 2009	1.9	%	5.00	1.0	%	38.80	%	$	3.64

All of the options in the tables above vest and become exercisable over a period of up to eight years. Generally, each option will terminate approximately nine years after the grant date.

The fair value of each share-based option is estimated on the date of grant using a Black-Scholes valuation method that uses the assumptions listed above. The risk-free interest rate is based on the U.S. Treasury rate over the expected life of the option at the time of grant. The expected life is the average length of time over which we expect the employee groups will exercise their options, which is based on historical experience with similar grants. The dividend yield is estimated over the expected life of the option based on our current dividend payout, historical dividends paid, and expected future cash dividends. Expected stock volatilities are based on the movement of our stock price over the most recent historical period equivalent to the expected life of the option.

Compensation expense equal to the grant date fair value is recognized for all of these awards over the vesting period. The stock-based compensation expense for the nine-month periods ended September 30, 2017 and 2016 was $4.0 and $2.9, respectively. Unrecognized stock-based compensation expense related to outstanding unvested stock options as of September 30, 2017 was $15.9 and is expected to be recognized over a weighted average period of 4.37 years. Any future changes in estimated forfeitures will impact this amount.

Earnings Per Share

The following tables present a reconciliation of the denominators used in the computation of basic and diluted earnings per share and a summary of the options to purchase shares of common stock which were excluded from the diluted earnings per share calculation because they were anti-dilutive:

	Nine-month Period		Three-month Period
Reconciliation	2017	2016	2017	2016
Basic weighted average shares outstanding	288,451,470	288,907,934	287,456,943	288,995,492
Weighted shares assumed upon exercise of stock options	140,104	227,908	121,100	154,114
Diluted weighted average shares outstanding	288,591,574	289,135,842	287,578,043	289,149,606

	Nine-month Period			Three-month Period
Summary of Anti-dilutive Options Excluded	2017		2016	2017		2016
Options to purchase shares of common stock	3,881,605		3,061,217	3,848,126		3,335,439
Weighted average exercise price of options	$	49.21	50.17	$	49.18	49.67

Any dilutive impact summarized above related to periods when the average market price of our stock exceeded the exercise price of the potentially dilutive stock options then outstanding.

8

FASTENAL COMPANY AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Amounts in millions except share and per share information and where otherwise noted)

September 30, 2017 and 2016

(Unaudited)

(4) Income Taxes

Fastenal files income tax returns in the United States federal jurisdiction, all states, and various local and foreign jurisdictions. With limited exceptions, we are no longer subject to income tax examinations by taxing authorities for taxable years before 2015 in the case of United States federal and foreign examinations and 2013 in the case of state and local examinations.

As of September 30, 2017 and 2016, liabilities recorded related to gross unrecognized tax benefits were $4.5 and $5.3, respectively. Included in these liabilities for gross unrecognized tax benefits is an immaterial amount for interest and penalties, both of which we classify as a component of income tax expense. We do not anticipate significant changes in total unrecognized tax benefits during the next twelve months.

(5) Operating Leases

Certain operating leases for pick-up trucks contain residual value guarantee provisions which would generally become due at the expiration of the operating lease agreement if the fair value of the leased vehicles is less than the guaranteed residual value. The aggregate residual value guarantee related to these leases is approximately $78.7. We believe the likelihood of funding the guarantee obligation under any provision of the operating lease agreements is remote other than where we have established an accrual for estimated losses, which is immaterial at September 30, 2017. To the extent our fleet contains vehicles we estimate will settle at a gain, such gains on these vehicles will be recognized when we sell the vehicle.

(6) Debt Commitments

Credit Facility, Notes Payable, and Commitments

Debt obligations and letters of credit outstanding at the end of each period consisted of the following:

	September 30, 2017			December 31, 2016
Outstanding loans under unsecured revolving credit facility	$	300.0		305.0
2.00% senior unsecured promissory note payable	40.0			40.0
2.45% senior unsecured promissory note payable	35.0			35.0
3.22% senior unsecured promissory note payable	60.0			—
Note payable under asset purchase agreement	5.0			10.0
Total debt	440.0			390.0
Less: Current portion of debt	(8.0		)	(10.5	)
Long-term debt	$	432.0		379.5
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation	$	36.3		36.3

Unsecured Revolving Credit Facility

We have a $700.0 committed unsecured revolving credit facility ('Credit Facility'). The Credit Facility includes a committed letter of credit subfacility of $55.0. The commitments under the Credit Facility will expire (and any borrowings outstanding under the Credit Facility will become due and payable) on March 10, 2020. In the next twelve months, we have the ability and intent to repay a portion of the outstanding loans using cash; therefore, we have classified this portion as a current liability. The Credit Facility contains certain financial and other covenants, and our right to borrow under the Credit Facility is conditioned upon, among other things, our compliance with these covenants. We are currently in compliance with these covenants.

Borrowings under the Credit Facility generally bear interest at a rate per annum equal to the London Interbank Offered Rate ('LIBOR') for interest periods of various lengths selected by us, plus 0.95%. Based on the interest periods we have chosen, our weighted per annum interest rate at September 30, 2017 was approximately 2.2%. We pay a commitment fee for the unused portion of the Credit Facility. This fee is either 0.10% or 0.125% per annum based on our usage of the Credit Facility.

9

FASTENAL COMPANY AND SUBSIDIARIES

Notes to Condensed Consolidated Financial Statements

(Amounts in millions except share and per share information and where otherwise noted)

September 30, 2017 and 2016

(Unaudited)

Senior Unsecured Promissory Notes Payable

On July 20, 2016 (the 'Effective Date'), we entered into a master note agreement (the 'Master Note Agreement') with certain institutional lenders, pursuant to which, during the period commencing on the Effective Date and ending three years thereafter, we may issue at our discretion in private placements, and the institutional lenders may purchase at their discretion, senior unsecured promissory notes of the Company (the 'Notes') in the aggregate principal amount outstanding from time to time of up to $200.0. The Notes will bear interest at either a fixed rate, or a floating rate based on LIBOR for an interest period of one, three, or six months. The Notes will mature no later than 12 years after the date of issuance thereof, in the case of fixed rate Notes, or 10 years after the date of issuance thereof, in the case of floating rate Notes. All of the Notes will be prepayable at our option in whole or in part. The Master Note Agreement contains certain financial and other covenants. We are currently in compliance with these covenants.

Three series of senior unsecured Notes are currently outstanding under the Master Note Agreement. The first series of Notes ('Series A'), was issued on the Effective Date, is in an aggregate principal amount of $40.0, is due and payable in full on July 20, 2021, and bears interest at a fixed rate of 2.00% per annum. The second series of Notes ('Series B'), was issued on the Effective Date, is in an aggregate principal amount of $35.0, is due and payable in full on July 20, 2022, and bears interest at a fixed rate of 2.45% per annum. The third series of Notes ('Series C'), was issued on March 1, 2017, is in an aggregate principal amount of $60.0, is due and payable in full on March 1, 2024, and bears interest at a fixed rate of 3.22% per annum. There is no amortization of these Notes prior to their maturity dates. Interest on the Notes is payable quarterly in arrears on January 20, April 20, July 20, and October 20 of each year. The carrying value of the Notes approximates fair value. The fair value was based on available external pricing data and current market rates for similar debt instruments, among other factors, which are classified as a Level 2 measurement under the fair value hierarchy.

Note Payable Under Asset Purchase Agreement

On December 7, 2015, we signed an agreement to purchase, effective January 2, 2017 ('Asset Purchase Effective Date'), certain assets related to the collection and management of certain portions of our business and financial data from Apex Industrial Technologies, LLC ('Apex'), a provider of automated point-of-use dispensing and supply chain technologies. The agreement includes a transition arrangement which requires us to assume responsibility for certain software that is licensed by Apex. The total consideration for the assets is $27.0, of which $12.0 was paid in cash in December 2015 in advance of the Asset Purchase Effective Date. The remaining $15.0 is payable in installments pursuant to an unsecured note. The first $5.0 installment was paid in December 2016, the second $5.0 installment was paid in June 2017, and the final installment of $5.0 will be paid in December 2017. The note bears interest at an annual rate of 0.56%. Interest on the unpaid principal balance of the note is due and payable on the last day of each calendar quarter.

(7) Legal Contingencies

The nature of our potential exposure to legal contingencies is described in our 2016 annual report on Form 10-K in Note 9 of the Notes to Consolidated Financial Statements. As of September 30, 2017, there were no litigation matters that we consider to be probable or reasonably possible to have a material adverse outcome.

(8) Subsequent Events

We evaluated all subsequent event activity and concluded that no subsequent events have occurred that would require recognition in the condensed consolidated financial statements or disclosure in the Notes to Condensed Consolidated Financial Statements, with the exception of the dividend disclosed in Note 3 'Stockholders' Equity'.

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ITEM 2 — MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is management's discussion and analysis of certain significant factors which have affected our financial position and operating results during the periods included in the accompanying condensed consolidated financial statements. Dollar amounts are stated in millions except for share and per share amounts and where otherwise noted. Throughout this document, percentage calculations, which are based on non-rounded dollar values, may not be able to be recalculated using the dollar values in this document due to the rounding of those dollar values.

Business

Fastenal is a North American leader in the wholesale distribution of industrial and construction supplies. We distribute these supplies through a network of approximately 2,400 company-owned branches. Most of our customers are in the manufacturing and non-residential construction markets. The manufacturing market includes both original equipment manufacturers (OEM) and maintenance, repair, and operations (MRO). The non-residential construction market includes general, electrical, plumbing, sheet metal, and road contractors. Other users of our products include farmers, truckers, railroads, oil exploration, production, and refinement companies, mining companies, federal, state, and local governmental entities, schools, and certain retail trades. Geographically, our branches and customers are primarily located in North America.

Our motto is Growth through Customer Service^®.We are a growth-centric organization focused on identifying 'drivers' that will allow us to get closer to our customers and gain market share in what we believe remains a fragmented industrial distribution market. Our growth drivers have evolved, and can be expected to continue to evolve, over time.

Executive Overview

Net sales increased $119.7, or 11.8%, in the third quarterof 2017 relative to the third quarter of 2016. Our gross profit as a percentage of net sales declined to 49.1% in the third quarter of 2017 from49.3% in the third quarter of 2016. Our operating income as a percentage of net sales improved to 20.2% in the third quarter of 2017 from 20.0%in the third quarter of 2016. Our net earnings during the third quarter of 2017 were$143.1, an increase of 12.7% when compared to the third quarter of 2016. Our diluted net earnings per sharewere $0.50 during the third quarter of 2017 compared to $0.44 during the third quarter of 2016.

We continue to focus on our growth drivers. During the third quarter of 2017, we signed 42 new national account contracts (defined as new customer accounts with a multi-site contract). Additionally, we signed 81 new Onsite customer locations(defined as dedicated sales and service provided from within, or in close proximity to, the customer's facility)and 4,771 new industrial vending machines in the third quarter of 2017.

The table below summarizes our branch and Onsite employee count and our total employee count at the end of the periods presented, and changes in that count from the end of the prior periods to the end of the most recent period. The final three items below summarize our cumulative investments in branch locations, Onsite locations, and industrial vending machines.

			Change Since:			Change Since:
	Q3 2017	Q4 2016	Q4 2016		Q3 2016	Q3 2016
End of period total in-market units (1) employee count	13,298	12,966	2.6	%	13,097	1.5	%
End of period total employee count	20,242	19,624	3.1	%	19,864	1.9	%
Number of public branch locations	2,418	2,503	-3.4	%	2,545	-5.0	%
Number of active Onsite locations	555	401	38.4	%	376	47.6	%
Number of in-market units (1)	2,973	2,904	2.4	%	2,921	1.8	%
Industrial vending machines (installed device count) (2)	69,058	62,822	9.9	%	60,400	14.3	%
Ratio of industrial vending machines to in-market units	23:1	22:1			21:1

⁽¹⁾ 'In-market units' is defined as the sum of the total number of public branch locations and the total number of active Onsite locations.

⁽²⁾ In February 2016, we signed an agreement to lease a significant number of industrial vending lockers to one of our customers. These devices do not generate product revenue and are excluded from the counts noted above.

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During the last twelve months, we have increased our headcount by 201 people in our in-market units and 378 people in total. Our total headcount includes 123 people related to our Mansco acquisition. The remaining increase is mostly a function of additions we have made to support customer growth in the field as well as investments in our growth drivers.

We opened 5 branches and closed 36 branches in the third quarter of 2017. Additionally, two branches were converted from a public branch to a non-public location. Our branch network forms the foundation of our business strategy, and we will continue to open or close branches in 2017 as is deemed necessary to sustain and improve our network and support our growth drivers.

Results of Operations

The following sets forth statement of earnings information (as a percentage of net sales) for the periods ended September 30:

	Nine-month Period				Three-month Period
	2017		2016		2017		2016
Net sales	100.0	%	100.0	%	100.0	%	100.0	%
Gross profit	49.4	%	49.5	%	49.1	%	49.3	%
Operating and administrative expenses	28.9	%	29.2	%	28.9	%	29.3	%
Gain on sale of property and equipment	0.0	%	0.0	%	0.0	%	0.0	%
Operating income	20.5	%	20.3	%	20.2	%	20.0	%
Net interest expense	-0.2	%	-0.2	%	-0.2	%	-0.2	%
Earnings before income taxes	20.4	%	20.2	%	20.0	%	19.9	%
Note – Amounts may not foot due to rounding difference.

Net Sales

Note – Daily sales are defined as the total net sales for the period divided by the number of business days (in the United States) in the period. 

The table below sets forth net sales and daily sales for the periods ended September 30, and changes in such sales from the prior period to the more recent period:

	Nine-month Period				Three-month Period
	2017		2016		2017		2016
Net sales	3,302.0		3,014.1		1,132.8		1,013.1
Percentage change	9.6	%	2.3	%	11.8	%	1.8	%
Business days	191		192		63		64
Daily sales	17.3		15.7		18.0		15.8
Percentage change	10.1	%	1.8	%	13.6	%	1.8	%
Impact of currency fluctuations	0.0	%	-0.4	%	0.3	%	-0.1	%
Impact of acquisitions	0.9	%	0.7	%	1.3	%	0.6	%

The increases in net sales in the periods noted above for 2017 and 2016, were driven primarily by higher unit sales. Price was not a material factor in the third quarter and first nine months of 2017 compared to the same periods of 2016. The higher unit sales resulted primarily from two sources. The first is improvement in underlying market demand. We believe the improvement in general business activity is reflected in a number of metrics. For instance, the Purchasing Managers Index, published by the Institute for Supply Chain Management, averaged 57.0, 55.8, and 58.6 in the first, second, and third quarters of 2017, respectively, well above 49.8, 51.5, and 51.2 in the first, second, and third quarters of 2016, respectively. Readings above 50 are indicative of growing demand, and we believe this is favorably influencing our unit sales. Sales of fasteners, our most cyclical product line, continued to grow in the third quarter of 2017. We also experienced growth in sales to 64, 68, and 72 of our top 100 customers in the first, second, and third quarters of 2017, respectively. As recently as the fourth quarter of 2016, this count was 51. As business conditions strengthen, they tend to lift our net sales growth rates as well.

The second source is success within our growth initiatives. We signed 15,089 industrial vending machines during the first nine months of 2017, an increase of 5.5% over the first nine months of 2016. We signed 4,771 industrial vending machines during the third quarter of 2017, which was comparable to the third quarter of 2016. Though the current period did not exhibit unit growth, the mix of machines improved with increases in the signings of larger volume machines, such as the FAST5000, and declines in lower volume lockers. Further, sales through our vending machines continued to grow at or near a double-digit pace during each of the first three quarters of 2017. We signed 213 new Onsite locations during the first nine months of 2017 and

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had 555 active sites on September 30, 2017, an increase of 47.6% over September 30, 2016. We signed 81 new Onsite locations during the third quarter of 2017, an increase of 97.6% over the third quarter of 2016. We signed 136 new national account contracts in the first nine months of 2017; 42 of these were signed in the third quarter of 2017. Daily sales from our national account customers grew 13.2% in the first nine months of 2017 over the first nine months of 2016, and grew 17.3% in the third quarter of 2017 over the third quarter of 2016.

Sales by Product Line

The approximate mix of sales from our fastener product line and from our other product lines was as follows for the periods ended September 30:

	Nine-month Period				Three-month Period
	2017		2016		2017		2016
Fastener product line	35.8	%	36.9	%	35.6	%	36.1	%
Other product lines	64.2	%	63.1	%	64.4	%	63.9	%
	100.0	%	100.0	%	100.0	%	100.0	%

Gross Profit

Our gross profit, as a percentage of net sales, was 49.4% in the first nine months of 2017 and 49.5% in the first nine months of 2016. The gross profit percentage for the first nine months of 2017 benefited from accelerating revenue growth rates, progress in our supply chain initiatives, as well as increased discipline in purchasing throughout the organization. This was offset by a roughly 30 basis point drag owing to two elements of mix. The first was a change in product and customer mix. Fasteners, which is currently our largest single product line at approximately 35.8% of sales, is our highest gross profit product line due to the high transaction cost surrounding the sourcing and supply of the product for customers. Any reduction in the mix of our sales attributable to fasteners, and particularly maintenance fasteners, may negatively impact gross profit. Larger customers (for which National Accounts are a good proxy), whose more focused buying patterns allow us to offer them better pricing, also influence gross profit. Branches typically achieve higher average net sales disproportionately by growth in the non-fastener product lines and with large customers, causing gross profit margin to decline as average net sales grow. From the first nine months of 2016 to the first nine months of 2017, our daily sales of fastener products grew 6.9% (of which 2.5 percentage points were attributable to Mansco) while our daily sales of non-fastener products grew 12.1%. The relatively slower growth that we experienced in the first nine months of 2017 in our fastener product line combined with relatively faster growth in sales to our largest customers partially offset the gross profit improvement we otherwise experienced in the period. The second element of mix was driven by the acquisition of Mansco. Mansco products carry a lower gross profit product mix than the Company.

In the third quarter of 2017, our gross profit, as a percentage of net sales, declined to 49.1% from 49.3% in the third quarter of 2016. Our gross profit over the period was adversely affected by roughly 30 to 40 basis points as a result of the same two elements of mix that affected the first nine months of 2017. We also believe the gross profit percentage was reduced by 10 to 20 basis points in the period from hurricanes that affected our Caribbean, Southeastern United States, and Gulf regions, the disruptions from which reduced net sales and gross profit dollars and resulted in an increase in sales of lower margin products. As with the first nine months of 2017, these factors were offset by accelerating revenue growth rates and progress in supply chain initiatives. During the third quarter of 2017, our daily sales of fastener products grew 12.1% (of which 3.8 percentage points were attributable to Mansco) and daily sales of non-fastener products grew 14.6% when compared to the third quarter of 2016.

Operating and Administrative Expenses

Our operating and administrative expenses (including a gain on the sale of property and equipment), as a percentage of net sales, improved to 28.9 % in the first nine months of 2017 from 29.2% in the first nine months of 2016. The primary contributor to this improvement was relatively modest growth in occupancy-related expenses. Though our employee-related expenses grew more quickly than our occupancy expenses, they also contributed to our leverage through the first nine months of 2017.

Our operating and administrative expenses (including a gain on the sale of property and equipment), as a percentage of net sales, improved to 28.9% in the third quarter of 2017 from 29.3% in the third quarter of 2016. The primary contributors to this improvement were relatively lower growth in occupancy-related and selling transportation expenses. This was partially offset by sharper growth in employee-related expenses. The leverage achieved over our operating and administrative expenses was diminished by one less selling day in the third quarter of 2017 versus the third quarter of 2016.

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The growth in employee-related, occupancy-related, and selling transportation expenses (the three largest components of our operating and administrative expenses) compared to the same periods in the preceding year, is outlined in the table below.

	Approximate Percentage of Total Operating and Administrative Expenses	Nine-month Period		Three-month Period
		2017		2017
Employee-related expenses	65% to 70%	8.4	%	12.3	%
Occupancy-related expenses	15% to 20%	2.0	%	1.5	%
Selling transportation expenses	5%	8.4	%	2.7	%

Employee-related expenses include: (1) payroll (which includes cash compensation, stock option expense, and profit sharing), (2) health care, (3) personnel development, and (4) social taxes. Our employee-related expenses increased in the nine-month period. This was related to: (1) higher bonuses and commissions due to growth in net sales and net earnings, as well as regulatory driven incremental compensation, (2) increased health care costs, (3) an increase in our profit sharing contribution, (4) an increase in stock option expense, (5) an increase in full-time equivalent ('FTE') headcount related to efforts to support growth in our business, and (6) the inclusion of Mansco personnel. The increase in the third quarter of 2017, when compared to the third quarter of 2016, was driven by items 1, 2, 5, and 6 noted above for the nine-month period.

The table below summarizes our FTE headcount at the end of the periods presented and changes in such headcount from the end of the prior periods to the end of the most recent period:

			Change Since:			Change Since:
	Q3	Q4	Q4		Q3	Q3
	2017	2016	2016		2016	2016
Branch and Onsite based FTE headcount	11,480	10,797	6.3	%	11,175	2.7	%
Total selling (includes branch and Onsite)	13,118	12,325	6.4	%	12,725	3.1	%
Distribution	2,502	2,330	7.4	%	2,449	2.2	%
Manufacturing	604	571	5.8	%	573	5.4	%
Administrative	1,105	1,039	6.4	%	1,064	3.9	%
Total	17,329	16,265	6.5	%	16,811	3.1	%

Occupancy-related expenses include: (1) building rent and depreciation, (2) building utility costs, (3) equipment related to our branches and distribution locations, and (4) industrial vending equipment (we consider the vending equipment, excluding leased locker equipment, to be a logical extension of our branch operation and classify the depreciation and repair costs as occupancy expense). The slight increase in occupancy-related expenses for the first nine months of 2017, when compared to the first nine months of 2016, was mainly driven by an increase in costs related to industrial vending equipment and an increase in automation equipment at our distribution centers. The slight increase in the third quarter of 2017, when compared to the third quarter of 2016, was driven by the same factors as the nine-month period and was only partly offset by a decrease in expenses related to a reduction in our public branch counts.

Our selling transportation expenses consist primarily of our branch fleet as most of the distribution fleet costs are included in cost of sales. These costs include: (1) expenses for our fleet of vehicles, and (2) fuel expense. Selling transportation expenses for the first nine months of 2017 increased when compared to the first nine months of 2016. We increased the size of our field-based vehicle fleet which resulted in higher expenses. However, the larger impact was a 15.3% increase in fuel expense due to higher fuel prices and consumption during the period. This was partially offset by improvements in gains on sales of leased vehicles. The increase in the third quarter of 2017, when compared to the third quarter of 2016, was mainly driven by the increase in the size of our field-based vehicle fleet.

Aside from these larger impacts, our operating and administrative expenses were also affected by increases in spending on information technology, as well as the absence of supplier marketing incentives that existed in the first nine months of 2016 as part of our CSP 16 initiative.

Net Interest Expense

Our net interest expense was $6.2 in the first nine months of 2017 and $2.5 in the third quarter of 2017, compared to $4.4 in the first nine months of 2016 and $1.7 in the third quarter of 2016. These increases were mainly caused by higher average interest rates over both periods.

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Income Taxes

Income tax expense, as a percentage of earnings before income taxes, was approximately 36.6% in the first nine months of 2017 and 36.7% in the third quarter of 2017, versus 36.8% for the first nine months of 2016 and 36.9% in the third quarter of 2016. The decline in the nine-month period resulted primarily from changes in our reserve for uncertain tax positions and the adoption of a new accounting standard (ASU 2016-09) in the first quarter of 2017. This standard addresses the accounting for excess tax benefits for share-based payments that were previously recorded in additional paid-in capital on the balance sheet and are now recognized in income tax expense on the income statement. Additional reductions arose from changes in our reserve for uncertain tax positions. A more detailed description of the impact of the adoption of ASU 2016-09 is included in Note 1 of the Notes to Condensed Consolidated Financial Statements.

Net Earnings

Our net earnings during the first nine months of 2017 were $426.2, an increase of 10.8% when compared to the first nine months of 2016. Our net earnings during the third quarter of 2017 were $143.1, an increase of 12.7% compared to the third quarter of 2016. Our diluted net earnings per share were $1.48 during the first nine months of 2017 compared to $1.33 during the first nine months of 2016, and $0.50 during the third quarter of 2017 compared to $0.44 during the third quarter of 2016.

Liquidity and Capital Resources

Cash flow activity was as follows for the periods ended September 30:

	Nine-month Period
	2017			2016
Net cash provided by operating activities	$	455.9		386.9
Percentage of net earnings	107.0		%	100.6	%
Net cash used in investing activities	$	138.2		157.6
Net cash used in financing activities	$	301.2		214.4

Net Cash Provided by Operating Activities

Net cash provided by operating activities increased in the first nine months of 2017 relative to the first nine months of 2016, primarily due to our net earnings growth.

The dollar and percentage change in accounts receivable, net and inventories from September 30, 2016 to September 30, 2017 were as follows:

	September 30:			Twelve-month Dollar Change		Twelve-month Percentage Change
	2017		2016	2017		2017
Accounts receivable, net	$	632.1	543.7	$	88.3	16.2	%
Inventories	1,047.0		966.9	80.1		8.3	%
Total	$	1,679.1	1,510.7	$	168.4	11.1	%
Net sales in last two months	$	782.8	703.2	$	79.6	11.3	%

Note - Amounts may not foot due to rounding difference.

The growth in our net accounts receivable from September 30, 2016 to September 30, 2017 was attributable in part to the Mansco acquisition. Absent that, receivables growth was broadly consistent with our net sales growth and was attributable primarily to an increase in general business activity. In any given period and over time, the strong growth of our international business and of our large customer accounts can result in faster growth in receivables relative to net sales growth.

The most significant contributors to the increase in inventory from September 30, 2016 to September 30, 2017 were the completion of the CSP 16 rollout in 2016, increased demand, and the Mansco acquisition in 2017.

Net Cash Used in Investing Activities

Net cash used in investing activities decreased from the first nine months of 2016 to the first nine months of 2017 primarily due to decreases in net capital expenditures, which was partially offset by the cash paid for the Mansco acquisition.

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During the first nine months of 2017, our net capital expenditures were $76.5 (or 17.9% of net earnings), which is a decrease of 51.4% from the first nine months of 2016. This reduction resulted from lower spending in 2017 to date related to: (1) vending equipment due to the 2016 leased locker rollout, (2) shelving and signage for the CSP 16 initiative in 2016, (3) the expansion of our distribution fleet, and (4) timing associated with the addition of pickup trucks.

Capital expenditures in the first nine months of 2017 and 2016 consisted of: (1) the purchase of software and hardware for our information processing systems, (2) the addition of fleet vehicles, (3) the purchase of signage, shelving, and other fixed assets related to branch openings and in 2016, our CSP 16 initiative, (4) the addition of manufacturing and warehouse equipment, including automation systems equipment, (5) the expansion or improvement of certain owned or leased branch properties, and (6) purchases related to industrial vending. Of these factors, items (1), (2), (4), and (6) had the greatest impact to our capital expenditures in the first nine months of 2017. Disposals of property and equipment consisted of the planned disposition of certain pick-up trucks, as well as distribution vehicles and trailers, in the normal course of business.

Cash requirements for capital expenditures were satisfied from cash generated from operations, available cash and cash equivalents, our borrowing capacity, and the proceeds of disposals. Our 2017 net capital expenditures spend expectation remains at approximately $127.0.

Net Cash Used in Financing Activities

Net cash used in financing activities in the first nine months of 2017 consisted of the payment of dividends, purchases of our common stock, and payments against debt obligations, which were partially offset by proceeds from the exercise of stock options and proceeds from debt obligations, including the issuance of a new series of senior unsecured promissory notes under our master note agreement in the aggregate principal amount of $60.0. The notes bear interest at a fixed rate of 3.22% per annum and are due and payable in full on March 1, 2024, and were issued to fund the purchase price of the Mansco acquisition. Net cash used in financing activities in the first nine months of 2016 consisted of payments of dividends and purchases of our common stock, which were partially offset by proceeds from the exercise of stock options and borrowings. During the first nine months of 2017, we purchased 1,900,000 shares of our common stock at an average price of approximately $43.43 per share. During the first nine months of 2016, we purchased 1,600,000 shares of our common stock at an average price of approximately $37.15 per share. On July 11, 2017, our board of directors authorized purchases by us of 5,000,000 shares of our common stock. We currently have authority to purchase up to 4,400,000 shares under this authorization. An overview of our dividends paid or declared in 2017 and 2016 is contained in Note 3 of the Notes to Condensed Consolidated Financial Statements.

Critical Accounting Policies – A discussion of our critical accounting policies is contained in our 2016 annual report on Form 10-K.

Recently Issued and Adopted Accounting Pronouncements – A description of recently issued and adopted accounting pronouncements is contained in Note 1 of the Notes to Condensed Consolidated Financial Statements.

Certain Contractual Obligations – A discussion of the nature and amount of certain of our contractual obligations is contained in our 2016 annual report on Form 10-K. That portion of total debt outstanding under our Credit Facility and notes payable classified as long-term, and the maturity of that debt, is described earlier in Note 6 of the Notes to Condensed Consolidated Financial Statements.

Certain Risks and Uncertainties – Certain statements contained in this document do not relate strictly to historical or current facts. As such, they are considered 'forward-looking statements' that provide current expectations or forecasts of future events. These forward-looking statements are made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Such statements can be identified by the use of terminology such as anticipate, believe, should, estimate, expect, intend, may, will, plan, goal, project, hope, trend, target, opportunity, and similar words or expressions, or by references to typical outcomes. Any statement that is not a historical fact, including estimates, projections, future trends, and the outcome of events that have not yet occurred, is a forward-looking statement. Our forward-looking statements generally relate to our expectations regarding the business environment in which we operate, our projections of future performance, our perceived marketplace opportunities, and our strategies, goals, mission, and vision. You should understand that forward-looking statements involve a variety of risks and uncertainties, known and unknown, and may be affected by inaccurate assumptions. Consequently, no forward-looking statement can be guaranteed and actual results may vary materially. Factors that could cause our actual results to differ from those discussed in the forward-looking statements include, but are not limited to, economic downturns, weakness in the manufacturing or commercial construction industries, competitive pressure on selling prices, changes in our current mix of products, customers or geographic locations, changes in our average branch size, changes in our purchasing patterns, changes in customer needs, changes in fuel or commodity prices, inclement weather, changes in foreign currency exchange rates, difficulty in adapting our business model to different foreign business environments, failure to accurately predict the market potential of our business strategies, the introduction or expansion of new business strategies,

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weak acceptance or adoption of our vending or Onsite business models, increased competition in industrial vending or Onsite distribution, difficulty in maintaining installation quality as our industrial vending business expands, the leasing to customers of a significant number of additional industrial vending machines, the failure to meet our goals and expectations regarding branch openings, branch closings, or expansion of our industrial vending or Onsite operations, changes in the implementation objectives of our business strategies, difficulty in hiring, relocating, training or retaining qualified personnel, difficulty in controlling operating expenses, difficulty in collecting receivables or accurately predicting future inventory needs, dramatic changes in sales trends, changes in supplier production lead times, changes in our cash position or our need to make capital expenditures, credit market volatility, changes in tax law, changes in the availability or price of commercial real estate, changes in the nature, price, or availability of distribution, supply chain, or other technology (including software licensed from third parties) and services related to that technology, cyber-security incidents, potential liability and reputational damage that can arise if our products are defective, and other risks and uncertainties detailed in our filings with the Securities and Exchange Commission, including our most recent annual and quarterly reports. Each forward-looking statement speaks only as of the date on which such statement is made, and we undertake no obligation to update any such statement to reflect events or circumstances arising after such date.

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ITEM 3 — QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS

We are exposed to certain market risks from changes in foreign currency exchange rates, commodity steel pricing, commodity energy prices, and interest rates. Changes in these factors cause fluctuations in our earnings and cash flows. We evaluate and manage exposure to these market risks as follows:

Foreign currency exchange rates – Foreign currency fluctuations can affect our net investments and earnings denominated in foreign currencies. Historically, our primary exchange rate exposure is with the Canadian dollar against the United States dollar. Our estimated net earnings exposure for foreign currency exchange rates was not material at the end of the period.

Commodity steel pricing – We buy and sell various types of steel products; these products consist primarily of different types of threaded fasteners. In the first nine months of 2017, we have seen some inflation in overall steel pricing. We are exposed to the impacts of commodity steel pricing and our related ability to pass through the impacts to our end customers.

Commodity energy prices – We have market risk for changes in prices of gasoline, diesel fuel, natural gas, and electricity; however, this risk is mitigated in part by our ability to pass freight costs to our customers, the efficiency of our trucking distribution network, and the ability, over time, to manage our occupancy costs related to the heating and cooling of our facilities through better efficiency.

Interest rates - Loans under our Credit Facility bear interest at floating rates tied to LIBOR. As a result, changes in LIBOR can affect our operating results and liquidity to the extent we do not have effective interest rate swap arrangements in place. We have not historically used interest rate swap arrangements to hedge the variable interest rates under our Credit Facility. A 1% increase in LIBOR in the first nine months of 2017 would have resulted in approximately $2.1 of additional interest expense. A description of our Credit Facility is contained in Note 6 of the Notes to Condensed Consolidated Financial Statements.

ITEM 4 — CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures – As of the end of the period covered by this report, we conducted an evaluation, under the supervision and with the participation of the principal executive officer and principal financial officer, of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934 (the 'Securities Exchange Act')). Based on this evaluation, the principal executive officer and principal financial officer concluded that our disclosure controls and procedures are effective to ensure that information required to be disclosed by us in reports that we file or submit under the Securities Exchange Act is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms, and is accumulated and communicated to our management, including the principal executive officer and principal financial officer, to allow for timely decisions regarding disclosure. There was no change in our internal control over financial reporting during our most recently completed fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

PART II — OTHER INFORMATION

ITEM 1 — LEGAL PROCEEDINGS

A description of our legal proceedings, if any, is contained in Note 7 of the Notes to Condensed Consolidated Financial Statements. The description of legal proceedings, if any, in Note 7 is incorporated herein by reference.

ITEM 1A — RISK FACTORS

The significant factors known to us that could materially adversely affect our business, financial condition, or operating results are described in Item 2 of Part I above and in our most recently filed annual report on Form 10-K under Forward-Looking Statements and Item 1A – Risk Factors. There has been no material change in those risk factors.

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ITEM 2 — UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Issuer Purchases of Equity Securities

The table below sets forth information regarding purchases of our common stock during the third quarter of 2017:

	(a)		(b)		(c)		(d)
Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (1)		Maximum Number (or Approximate Dollar Value) of Shares that May Yet Be Purchased Under the Plans or Programs (1)
July 1-31, 2017		600,000		$43.03		600,000		4,400,000
August 1-31, 2017		0		$0.00		0		4,400,000
September 1-30, 2017		0		$0.00		0		4,400,000
Total		600,000		$43.03		600,000		4,400,000

(1) On July 11, 2017, our board of directors established a new authorization for us to repurchase up to 5,000,000 shares of our common stock. As of September 30, 2017, we had remaining authority to repurchase 4,400,000 shares under this authorization.

ITEM 6 — EXHIBITS

INDEX TO EXHIBITS

Exhibit Number	Description of Document
3.1	Restated Articles of Incorporation of Fastenal Company, as amended (incorporated by reference to Exhibit 3.1 to Fastenal Company's Form 10-Q for the quarter ended March 31, 2012 (file no. 000-16125))
3.2	Restated By-Laws of Fastenal Company (incorporated by reference to Exhibit 3.2 to Fastenal Company's Form 8-K dated as of October 15, 2010 (file no. 000-16125))
31	Certifications under Section 302 of the Sarbanes-Oxley Act of 2002
32	Certification under Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Calculation Linkbase Document
101.DEF	XBRL Taxonomy Definition Linkbase Document
101.LAB	XBRL Taxonomy Label Linkbase Document
101.PRE	XBRL Taxonomy Presentation Linkbase Document

19

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		FASTENAL COMPANY
Date: October 16, 2017	By:	/s/ Holden Lewis
		Holden Lewis
		Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)
Date: October 16, 2017	By:	/s/ Sheryl A. Lisowski
		Sheryl A. Lisowski
		Controller, Chief Accounting Officer, and
		Treasurer (Duly Authorized Officer)

20

EX-31

Exhibit 31

CERTIFICATIONS

I, Daniel L. Florness, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Fastenal Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: October 16, 2017	/s/ Daniel L. Florness
	Daniel L. Florness
	President and Chief Executive Officer
	(Principal Executive Officer)

Exhibit 31 (continued)

CERTIFICATIONS

I, Holden Lewis, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Fastenal Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: October 16, 2017	/s/ Holden Lewis
	Holden Lewis
	Executive Vice President and Chief Financial Officer
	(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION UNDER SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned certifies that this periodic report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in this periodic report fairly presents, in all material respects, the financial condition and results of operations of Fastenal Company.

A signed original of this written statement required by Section 906 has been provided to Fastenal Company and will be retained by Fastenal Company and furnished to the Securities and Exchange Commission or its staff upon request.

Date: October 16, 2017
/s/ Daniel L. Florness	/s/ Holden Lewis
Daniel L. Florness	Holden Lewis
President and Chief Executive Officer	Executive Vice President and Chief Financial Officer
(Principal Executive Officer)	(Principal Financial Officer)

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 10, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Trading Symbol	fast
Entity Registrant Name	FASTENAL CO
Entity Central Index Key	0000815556
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		287,390,374

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 133.4	$ 112.7
Trade accounts receivable, net of allowance for doubtful accounts of $11.4 and $11.2, respectively	632.1	499.7
Inventories	1,047.0	993.0
Prepaid income taxes	0.0	12.9
Other current assets	117.7	102.5
Total current assets	1,930.2	1,720.8
Property and equipment, net	889.3	899.7
Other assets	82.1	48.4
Total assets	2,901.6	2,668.9
Current liabilities:
Current portion of debt	8.0	10.5
Accounts payable	147.1	108.8
Accrued expenses	198.7	156.4
Income taxes payable	6.6	0.0
Total current liabilities	360.4	275.7
Long-term debt	432.0	379.5
Deferred income tax liabilities	82.9	80.6
Stockholders' equity:
Preferred stock: $0.01 par value, 5,000,000 shares authorized, no shares issued or outstanding	0.0	0.0
Common stock: $0.01 par value, 400,000,000 shares authorized, 287,383,174 and 289,161,924 shares issued and outstanding, respectively	2.9	2.9
Additional paid-in capital	1.3	37.4
Retained earnings	2,050.2	1,940.1
Accumulated other comprehensive loss	(28.1)	(47.3)
Total stockholders' equity	2,026.3	1,933.1
Total liabilities and stockholders' equity	$ 2,901.6	$ 2,668.9

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Trade accounts receivable, allowance for doubtful accounts	$ 11.4	$ 11.2
Preferred stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Authorized (in shares)	5,000,000	5,000,000
Issued (in shares)	0	0
Outstanding (in shares)	0	0
Common stock
Par value (in dollars per share)	$ 0.01	$ 0.01
Authorized (in shares)	400,000,000	400,000,000
Issued (in shares)	287,383,174	289,161,924
Outstanding (in shares)	287,383,174	289,161,924

XML

Condensed Consolidated Statements of Earnings - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 1,132.8	$ 1,013.1	$ 3,302.0	$ 3,014.1
Cost of sales	576.9	513.3	1,669.6	1,521.2
Gross profit	555.9	499.8	1,632.4	1,492.9
Operating and administrative expenses	327.5	297.1	955.0	879.9
Gain on sale of property and equipment	(0.1)	(0.2)	(1.1)	(0.3)
Operating income	228.5	202.9	678.5	613.3
Interest income	0.1	0.1	0.3	0.3
Interest expense	(2.6)	(1.8)	(6.5)	(4.7)
Earnings before income taxes	226.0	201.2	672.3	608.9
Income tax expense	82.9	74.3	246.1	224.3
Net earnings	$ 143.1	$ 126.9	$ 426.2	$ 384.6
Basic net earnings per share (in dollars per share)	$ 0.50	$ 0.44	$ 1.48	$ 1.33
Diluted net earnings per share (in dollars per share)	$ 0.50	$ 0.44	$ 1.48	$ 1.33
Basic weighted average shares outstanding (in shares)	287,456,943	288,995,492	288,451,470	288,907,934
Diluted weighted average shares outstanding (in shares)	287,578,043	289,149,606	288,591,574	289,135,842

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 143.1	$ 126.9	$ 426.2	$ 384.6
Other comprehensive income, net of tax:
Foreign currency translation adjustments (net of tax of $0.0 in 2017 and 2016)	8.2	(2.9)	19.2	9.3
Comprehensive income	$ 151.3	$ 124.0	$ 445.4	$ 393.9

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, tax	$ 0	$ 0	$ 0	$ 0

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net earnings	$ 426.2	$ 384.6
Adjustments to reconcile net earnings to net cash provided by operating activities, net of acquisition:
Depreciation of property and equipment	92.3	74.5
Gain on sale of property and equipment	(1.1)	(0.3)
Bad debt expense	6.2	6.6
Deferred income taxes	2.3	2.7
Stock-based compensation	4.0	2.9
Amortization of intangible assets	2.8	0.4
Changes in operating assets and liabilities, net of acquisition:
Trade accounts receivable	(126.2)	(80.4)
Inventories	(31.2)	(51.0)
Other current assets	(15.2)	11.6
Accounts payable	35.9	(8.2)
Accrued expenses	42.3	3.8
Income taxes	19.5	39.8
Other	(1.9)	(0.1)
Net cash provided by operating activities	455.9	386.9
Cash flows from investing activities:
Purchases of property and equipment	(82.7)	(162.0)
Proceeds from sale of property and equipment	6.2	4.6
Cash paid for acquisition	(58.7)	0.0
Other	(3.0)	(0.2)
Net cash used in investing activities	(138.2)	(157.6)
Cash flows from financing activities:
Proceeds from debt obligations	805.0	760.0
Payments against debt obligations	(750.0)	(680.0)
Proceeds from exercise of stock options	3.5	25.0
Purchases of common stock	(82.6)	(59.5)
Payments of dividends	(277.1)	(259.9)
Net cash used in financing activities	(301.2)	(214.4)
Effect of exchange rate changes on cash and cash equivalents	4.2	3.1
Net increase in cash and cash equivalents	20.7	18.0
Cash and cash equivalents at beginning of period	112.7	129.0
Cash and cash equivalents at end of period	133.4	147.0
Supplemental disclosure of cash flow information:
Cash paid for interest	6.1	4.4
Net cash paid for income taxes	$ 223.8	$ 181.2

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Basis of Presentation

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

(1) Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of Fastenal Company and subsidiaries (collectively referred to as the Company, Fastenal, or by terms such as we, our, or us) have been prepared in accordance with U.S. generally accepted accounting principles ('GAAP') for interim financial information. They do not include all information and footnotes required by U.S. GAAP for complete financial statements. However, except as described herein, there has been no material change in the information disclosed in the Notes to Consolidated Financial Statements included in our consolidated financial statements as of and for the year ended December 31, 2016. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

Recently Adopted Accounting Pronouncements

Effective January 1, 2017, we adopted the Financial Accounting Standards Board ('FASB') Accounting Standards Update ('ASU') 2016-09, Improvements to Employee Share-Based Payment Accounting. The standard simplifies several aspects of the accounting for employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding requirements, as well as classification in the Condensed Consolidated Statements of Cash Flows. As a result of the adoption, on a prospective basis, for the nine and three month periods ended September 30, 2017, we recognized $0.5 and $0.0,respectively, of excess tax benefits from stock-based compensation as a discrete item in our income tax expense. Historically, these amounts were recorded as additional paid-in capital. Upon adoption, we elected to apply the change retrospectively to our Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2016, which resulted in a reclassification of excess tax benefits from stock-based compensation of $5.5 offsetting cash flows used in financing activities to cash flows provided by operating activities. We elected not to change our policy on accounting for forfeitures and will continue to estimate a requisite forfeiture rate. Additional amendments to the accounting for income taxes and minimum statutory withholding requirements had no impact on our results of operations.

Recently Issued Accounting Pronouncements

In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU 2014-09 for all entities by one year. This update is effective for public business entities for annual reporting periods beginning after December 15, 2017, including interim periods within those reporting periods. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. ASU 2014-09 was to become effective for us beginning January 2017; however, ASU 2015-14 defers our effective date until January 2018, which is when we plan to adopt this standard. The ASU permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The ASU also requires expanded disclosures relating to the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required for customer contracts, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. While we are still in the process of evaluating the effect of adoption on our consolidated financial statements and are currently assessing our contracts with customers, we do not currently expect a material impact on our results of operations, cash flows or financial position. The majority of our revenue arrangements generally consist of a single performance obligation to transfer promised goods or services. We anticipate we will expand our consolidated financial statement disclosures in order to comply with the ASU. We have not yet decided on our transition method upon adoption, but plan to select a transition method in the fourth quarter of 2017.

In February 2016, the FASB issued ASU 2016-02, Leases, which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The update is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those reporting periods, with early adoption permitted. The guidance will be applied on a modified retrospective basis with the earliest period presented. Based on the effective date, this guidance will apply beginning January 2019, which is when we plan to adopt this ASU. While we are still in the process of evaluating the effect of adoption on our consolidated financial statements and are currently assessing our leases, we expect the adoption will lead to a material increase in the assets and liabilities recorded on our Condensed Consolidated Balance Sheets. As part of our assessment, we will need to determine the impact of lease extension provisions provided in our facility and vehicle leases, which will impact the amount of the right of use asset and lease liability recorded under the ASU.

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Acquisition

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Acquisition

(2) Acquisition

On March 31, 2017, we acquired certain assets and assumed certain liabilities of Manufacturers Supply Company (‘Mansco’). Mansco, based in Hudsonville, Michigan, is a distributor of industrial and fastener supplies with a particularly strong market position with commercial furniture original equipment manufacturers. As such, this acquisition gives us a presence in a market where we have not meaningfully contributed in the past, while providing Mansco with additional tools with which to service its customer base and reduce costs through economies of scale.

The total purchase price for this acquisition consisted of $57.9 paid in cash at closing, $0.8 paid in cash after closing pursuant to a post-closing purchase price adjustment, and a contingent consideration arrangement which requires us to pay the former owner up to a maximum of $2.5 (undiscounted) in cash after closing based on sales growth of the acquired business. The fair value of the contingent consideration arrangement as of September 30, 2017, estimated by applying the income approach, which is a Level 3 measurement under the fair value hierarchy, was $0.6. Assuming payment of $0.6 of the contingent consideration arrangement, the total consideration for the acquisition will be $59.3. We funded the purchase price for the acquisition with the proceeds from the issuance during the first quarter of 2017 of a new series of senior unsecured promissory notes under our master note agreement in the aggregate principal amount of $60.0.

The fair value of the assets acquired and liabilities assumed is summarized below.

Current assets	$	21.7
Property and equipment	0.9
Identifiable intangible assets	20.1
Current liabilities	(1.8		)
Total identifiable net assets	40.9
Goodwill	18.4
Total fair value of assets acquired and liabilities assumed	$	59.3

The identifiable intangible assets consist mainly of the value of the customer relationships that were acquired and the goodwill consists largely of the synergies and economies of scale expected from combining the Mansco operations with our existing operations. The identifiable intangible assets and goodwill are deductible for income tax purposes.

The amount of net sales and net earnings of the acquired business included in our condensed consolidated statement of earnings for the periods ended September 30, 2017, and the pro forma net sales and net earnings of the combined entity had the acquisition occurred on January 1, 2016, are:

	Nine-month Period			Three-month Period
	2017		2016	2017		2016
Net sales	$	40.4	36.7	$	13.4	12.7
Net earnings	$	4.6	3.7	$	1.4	1.2

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Stockholders' Equity

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Stockholders' Equity

(3) Stockholders' Equity

Dividends

On October 10, 2017, our board of directors declared a dividend of $0.32 per share of common stock. This dividend is to be paid in cash on November 22, 2017 to shareholders of record at the close of business on October 25, 2017. Since 2011, we have paid quarterly dividends. Our board of directors expects to continue paying quarterly dividends, provided the future determination as to payment of dividends will depend on the financial needs of the Company and such other factors as deemed relevant by the board of directors.

The following table presents the dividends either paid previously or declared by our board of directors for future payment on a per share basis:

	2017		2016
First quarter	$	0.32	0.30
Second quarter	0.32		0.30
Third quarter	0.32		0.30
Fourth quarter	0.32		0.30
Total	$	1.28	1.20

Stock Options

The following tables summarize the details of options granted under our stock option plan that were still outstanding as of September 30, 2017, and the assumptions used to value these grants. All such grants were effective at the close of business on the date of grant.

	Options Granted	Option Exercise (Strike) Price		Closing Stock Price on Date of Grant		September 30, 2017
Date of Grant						Options Outstanding	Options Exercisable
January 3, 2017	764,789	$	47.00	$	46.95	725,542	—
April 19, 2016	845,440	$	46.00	$	45.74	757,522	—
April 21, 2015	893,220	$	42.00	$	41.26	700,746	—
April 22, 2014	955,000	$	56.00	$	50.53	572,500	116,250
April 16, 2013	205,000	$	54.00	$	49.25	104,250	57,250
April 17, 2012	1,235,000	$	54.00	$	49.01	957,938	776,103
April 19, 2011	410,000	$	35.00	$	31.78	72,550	47,550
April 20, 2010	530,000	$	30.00	$	27.13	107,800	82,800
April 21, 2009	790,000	$	27.00	$	17.61	221,650	221,650
Total	6,628,449					4,220,498	1,301,603

Date of Grant	Risk-free Interest Rate		Expected Life of Option in Years	Expected Dividend Yield		Expected Stock Volatility		Estimated Fair Value of Stock Option
January 3, 2017	1.9	%	5.00	2.6	%	24.49	%	$	8.40
April 19, 2016	1.3	%	5.00	2.6	%	26.34	%	$	8.18
April 21, 2015	1.3	%	5.00	2.7	%	26.84	%	$	7.35
April 22, 2014	1.8	%	5.00	2.0	%	28.55	%	$	9.57
April 16, 2013	0.7	%	5.00	1.6	%	37.42	%	$	12.66
April 17, 2012	0.9	%	5.00	1.4	%	39.25	%	$	13.69
April 19, 2011	2.1	%	5.00	1.6	%	39.33	%	$	11.20
April 20, 2010	2.6	%	5.00	1.5	%	39.10	%	$	8.14
April 21, 2009	1.9	%	5.00	1.0	%	38.80	%	$	3.64

All of the options in the tables above vest and become exercisable over a period of up to eight years. Generally, each option will terminate approximately nine years after the grant date.

The fair value of each share-based option is estimated on the date of grant using a Black-Scholes valuation method that uses the assumptions listed above. The risk-free interest rate is based on the U.S. Treasury rate over the expected life of the option at the time of grant. The expected life is the average length of time over which we expect the employee groups will exercise their options, which is based on historical experience with similar grants. The dividend yield is estimated over the expected life of the option based on our current dividend payout, historical dividends paid, and expected future cash dividends. Expected stock volatilities are based on the movement of our stock price over the most recent historical period equivalent to the expected life of the option.

Compensation expense equal to the grant date fair value is recognized for all of these awards over the vesting period. The stock-based compensation expense for the nine-month periods ended September 30, 2017 and 2016 was $4.0 and $2.9, respectively. Unrecognized stock-based compensation expense related to outstanding unvested stock options as of September 30, 2017 was $15.9 and is expected to be recognized over a weighted average period of 4.37 years. Any future changes in estimated forfeitures will impact this amount.

Earnings Per Share

The following tables present a reconciliation of the denominators used in the computation of basic and diluted earnings per share and a summary of the options to purchase shares of common stock which were excluded from the diluted earnings per share calculation because they were anti-dilutive:

	Nine-month Period		Three-month Period
Reconciliation	2017	2016	2017	2016
Basic weighted average shares outstanding	288,451,470	288,907,934	287,456,943	288,995,492
Weighted shares assumed upon exercise of stock options	140,104	227,908	121,100	154,114
Diluted weighted average shares outstanding	288,591,574	289,135,842	287,578,043	289,149,606

	Nine-month Period			Three-month Period
Summary of Anti-dilutive Options Excluded	2017		2016	2017		2016
Options to purchase shares of common stock	3,881,605		3,061,217	3,848,126		3,335,439
Weighted average exercise price of options	$	49.21	50.17	$	49.18	49.67

Any dilutive impact summarized above related to periods when the average market price of our stock exceeded the exercise price of the potentially dilutive stock options then outstanding.

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

(4) Income Taxes

Fastenal files income tax returns in the United States federal jurisdiction, all states, and various local and foreign jurisdictions. With limited exceptions, we are no longer subject to income tax examinations by taxing authorities for taxable years before 2015 in the case of United States federal and foreign examinations and 2013 in the case of state and local examinations.

As of September 30, 2017 and 2016, liabilities recorded related to gross unrecognized tax benefits were $4.5 and $5.3, respectively. Included in these liabilities for gross unrecognized tax benefits is an immaterial amount for interest and penalties, both of which we classify as a component of income tax expense. We do not anticipate significant changes in total unrecognized tax benefits during the next twelve months.

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Operating Leases

9 Months Ended

Sep. 30, 2017

Leases, Operating [Abstract]

Operating Leases

(5) Operating Leases

Certain operating leases for pick-up trucks contain residual value guarantee provisions which would generally become due at the expiration of the operating lease agreement if the fair value of the leased vehicles is less than the guaranteed residual value. The aggregate residual value guarantee related to these leases is approximately $78.7. We believe the likelihood of funding the guarantee obligation under any provision of the operating lease agreements is remote other than where we have established an accrual for estimated losses, which is immaterial at September 30, 2017. To the extent our fleet contains vehicles we estimate will settle at a gain, such gains on these vehicles will be recognized when we sell the vehicle.

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Debt Commitments

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt Commitments

(6) Debt Commitments

Credit Facility, Notes Payable, and Commitments

Debt obligations and letters of credit outstanding at the end of each period consisted of the following:

	September 30, 2017			December 31, 2016
Outstanding loans under unsecured revolving credit facility	$	300.0		305.0
2.00% senior unsecured promissory note payable	40.0			40.0
2.45% senior unsecured promissory note payable	35.0			35.0
3.22% senior unsecured promissory note payable	60.0			—
Note payable under asset purchase agreement	5.0			10.0
Total debt	440.0			390.0
Less: Current portion of debt	(8.0		)	(10.5	)
Long-term debt	$	432.0		379.5
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation	$	36.3		36.3

Unsecured Revolving Credit Facility

We have a $700.0 committed unsecured revolving credit facility ('Credit Facility'). The Credit Facility includes a committed letter of credit subfacility of $55.0. The commitments under the Credit Facility will expire (and any borrowings outstanding under the Credit Facility will become due and payable) on March 10, 2020. In the next twelve months, we have the ability and intent to repay a portion of the outstanding loans using cash; therefore, we have classified this portion as a current liability. The Credit Facility contains certain financial and other covenants, and our right to borrow under the Credit Facility is conditioned upon, among other things, our compliance with these covenants. We are currently in compliance with these covenants.

Borrowings under the Credit Facility generally bear interest at a rate per annum equal to the London Interbank Offered Rate ('LIBOR') for interest periods of various lengths selected by us, plus 0.95%. Based on the interest periods we have chosen, our weighted per annum interest rate at September 30, 2017 was approximately 2.2%. We pay a commitment fee for the unused portion of the Credit Facility. This fee is either 0.10% or 0.125% per annum based on our usage of the Credit Facility.

Senior Unsecured Promissory Notes Payable

On July 20, 2016 (the 'Effective Date'), we entered into a master note agreement (the 'Master Note Agreement') with certain institutional lenders, pursuant to which, during the period commencing on the Effective Date and ending three years thereafter, we may issue at our discretion in private placements, and the institutional lenders may purchase at their discretion, senior unsecured promissory notes of the Company (the 'Notes') in the aggregate principal amount outstanding from time to time of up to $200.0. The Notes will bear interest at either a fixed rate, or a floating rate based on LIBOR for an interest period of one, three, or six months. The Notes will mature no later than 12 years after the date of issuance thereof, in the case of fixed rate Notes, or 10 years after the date of issuance thereof, in the case of floating rate Notes. All of the Notes will be prepayable at our option in whole or in part. The Master Note Agreement contains certain financial and other covenants. We are currently in compliance with these covenants.

Three series of senior unsecured Notes are currently outstanding under the Master Note Agreement. The first series of Notes ('Series A'), was issued on the Effective Date, is in an aggregate principal amount of $40.0, is due and payable in full on July 20, 2021, and bears interest at a fixed rate of 2.00% per annum. The second series of Notes ('Series B'), was issued on the Effective Date, is in an aggregate principal amount of $35.0, is due and payable in full on July 20, 2022, and bears interest at a fixed rate of 2.45% per annum. The third series of Notes ('Series C'), was issued on March 1, 2017, is in an aggregate principal amount of $60.0, is due and payable in full on March 1, 2024, and bears interest at a fixed rate of 3.22% per annum. There is no amortization of these Notes prior to their maturity dates. Interest on the Notes is payable quarterly in arrears on January 20, April 20, July 20, and October 20 of each year. The carrying value of the Notes approximates fair value. The fair value was based on available external pricing data and current market rates for similar debt instruments, among other factors, which are classified as a Level 2 measurement under the fair value hierarchy.

Note Payable Under Asset Purchase Agreement

On December 7, 2015, we signed an agreement to purchase, effective January 2, 2017 ('Asset Purchase Effective Date'), certain assets related to the collection and management of certain portions of our business and financial data from Apex Industrial Technologies, LLC ('Apex'), a provider of automated point-of-use dispensing and supply chain technologies. The agreement includes a transition arrangement which requires us to assume responsibility for certain software that is licensed by Apex. The total consideration for the assets is $27.0, of which $12.0 was paid in cash in December 2015 in advance of the Asset Purchase Effective Date. The remaining $15.0 is payable in installments pursuant to an unsecured note. The first $5.0 installment was paid in December 2016, the second $5.0 installment was paid in June 2017, and the final installment of $5.0 will be paid in December 2017. The note bears interest at an annual rate of 0.56%. Interest on the unpaid principal balance of the note is due and payable on the last day of each calendar quarter.

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Legal Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Legal Contingencies

(7) Legal Contingencies

The nature of our potential exposure to legal contingencies is described in our 2016 annual report on Form 10-K in Note 9 of the Notes to Consolidated Financial Statements. As of September 30, 2017, there were no litigation matters that we consider to be probable or reasonably possible to have a material adverse outcome.

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Subsequent Events

9 Months Ended

Sep. 30, 2017

Subsequent Events [Abstract]

Subsequent Events

(8) Subsequent Events

We evaluated all subsequent event activity and concluded that no subsequent events have occurred that would require recognition in the condensed consolidated financial statements or disclosure in the Notes to Condensed Consolidated Financial Statements, with the exception of the dividend disclosed in Note 3 'Stockholders' Equity'.

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Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements of Fastenal Company and subsidiaries (collectively referred to as the Company, Fastenal, or by terms such as we, our, or us) have been prepared in accordance with U.S. generally accepted accounting principles ('GAAP') for interim financial information. They do not include all information and footnotes required by U.S. GAAP for complete financial statements. However, except as described herein, there has been no material change in the information disclosed in the Notes to Consolidated Financial Statements included in our consolidated financial statements as of and for the year ended December 31, 2016. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

Recently Adopted and Recently Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Effective January 1, 2017, we adopted the Financial Accounting Standards Board ('FASB') Accounting Standards Update ('ASU') 2016-09, Improvements to Employee Share-Based Payment Accounting. The standard simplifies several aspects of the accounting for employee share-based payment transactions, including accounting for income taxes, forfeitures, and statutory withholding requirements, as well as classification in the Condensed Consolidated Statements of Cash Flows. As a result of the adoption, on a prospective basis, for the nine and three month periods ended September 30, 2017, we recognized $0.5 and $0.0,respectively, of excess tax benefits from stock-based compensation as a discrete item in our income tax expense. Historically, these amounts were recorded as additional paid-in capital. Upon adoption, we elected to apply the change retrospectively to our Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2016, which resulted in a reclassification of excess tax benefits from stock-based compensation of $5.5 offsetting cash flows used in financing activities to cash flows provided by operating activities. We elected not to change our policy on accounting for forfeitures and will continue to estimate a requisite forfeiture rate. Additional amendments to the accounting for income taxes and minimum statutory withholding requirements had no impact on our results of operations.

Recently Issued Accounting Pronouncements

In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, which defers the effective date of ASU 2014-09 for all entities by one year. This update is effective for public business entities for annual reporting periods beginning after December 15, 2017, including interim periods within those reporting periods. Earlier application is permitted only as of annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period. ASU 2014-09 was to become effective for us beginning January 2017; however, ASU 2015-14 defers our effective date until January 2018, which is when we plan to adopt this standard. The ASU permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the cumulative catch-up transition method). The ASU also requires expanded disclosures relating to the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. Additionally, qualitative and quantitative disclosures are required for customer contracts, significant judgments and changes in judgments, and assets recognized from the costs to obtain or fulfill a contract. While we are still in the process of evaluating the effect of adoption on our consolidated financial statements and are currently assessing our contracts with customers, we do not currently expect a material impact on our results of operations, cash flows or financial position. The majority of our revenue arrangements generally consist of a single performance obligation to transfer promised goods or services. We anticipate we will expand our consolidated financial statement disclosures in order to comply with the ASU. We have not yet decided on our transition method upon adoption, but plan to select a transition method in the fourth quarter of 2017.

In February 2016, the FASB issued ASU 2016-02, Leases, which introduces the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous guidance. The update is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those reporting periods, with early adoption permitted. The guidance will be applied on a modified retrospective basis with the earliest period presented. Based on the effective date, this guidance will apply beginning January 2019, which is when we plan to adopt this ASU. While we are still in the process of evaluating the effect of adoption on our consolidated financial statements and are currently assessing our leases, we expect the adoption will lead to a material increase in the assets and liabilities recorded on our Condensed Consolidated Balance Sheets. As part of our assessment, we will need to determine the impact of lease extension provisions provided in our facility and vehicle leases, which will impact the amount of the right of use asset and lease liability recorded under the ASU.

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Acquisition (Tables)

9 Months Ended

Sep. 30, 2017

Business Combinations [Abstract]

Schedule of Fair Value Allocation for Assets Acquired and Liabilities Assumed

The fair value of the assets acquired and liabilities assumed is summarized below.

Current assets	$	21.7
Property and equipment	0.9
Identifiable intangible assets	20.1
Current liabilities	(1.8		)
Total identifiable net assets	40.9
Goodwill	18.4
Total fair value of assets acquired and liabilities assumed	$	59.3

Business Acquisition, Pro Forma Information

The amount of net sales and net earnings of the acquired business included in our condensed consolidated statement of earnings for the periods ended September 30, 2017, and the pro forma net sales and net earnings of the combined entity had the acquisition occurred on January 1, 2016, are:

	Nine-month Period			Three-month Period
	2017		2016	2017		2016
Net sales	$	40.4	36.7	$	13.4	12.7
Net earnings	$	4.6	3.7	$	1.4	1.2

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Stockholders' Equity Note [Abstract]

Schedule of Dividends Paid Previously or Declared

The following table presents the dividends either paid previously or declared by our board of directors for future payment on a per share basis:

	2017		2016
First quarter	$	0.32	0.30
Second quarter	0.32		0.30
Third quarter	0.32		0.30
Fourth quarter	0.32		0.30
Total	$	1.28	1.20

Stock Options Granted

The following tables summarize the details of options granted under our stock option plan that were still outstanding as of September 30, 2017, and the assumptions used to value these grants. All such grants were effective at the close of business on the date of grant.

	Options Granted	Option Exercise (Strike) Price		Closing Stock Price on Date of Grant		September 30, 2017
Date of Grant						Options Outstanding	Options Exercisable
January 3, 2017	764,789	$	47.00	$	46.95	725,542	—
April 19, 2016	845,440	$	46.00	$	45.74	757,522	—
April 21, 2015	893,220	$	42.00	$	41.26	700,746	—
April 22, 2014	955,000	$	56.00	$	50.53	572,500	116,250
April 16, 2013	205,000	$	54.00	$	49.25	104,250	57,250
April 17, 2012	1,235,000	$	54.00	$	49.01	957,938	776,103
April 19, 2011	410,000	$	35.00	$	31.78	72,550	47,550
April 20, 2010	530,000	$	30.00	$	27.13	107,800	82,800
April 21, 2009	790,000	$	27.00	$	17.61	221,650	221,650
Total	6,628,449					4,220,498	1,301,603

Fair Value Assumptions for Options Granted

Date of Grant	Risk-free Interest Rate		Expected Life of Option in Years	Expected Dividend Yield		Expected Stock Volatility		Estimated Fair Value of Stock Option
January 3, 2017	1.9	%	5.00	2.6	%	24.49	%	$	8.40
April 19, 2016	1.3	%	5.00	2.6	%	26.34	%	$	8.18
April 21, 2015	1.3	%	5.00	2.7	%	26.84	%	$	7.35
April 22, 2014	1.8	%	5.00	2.0	%	28.55	%	$	9.57
April 16, 2013	0.7	%	5.00	1.6	%	37.42	%	$	12.66
April 17, 2012	0.9	%	5.00	1.4	%	39.25	%	$	13.69
April 19, 2011	2.1	%	5.00	1.6	%	39.33	%	$	11.20
April 20, 2010	2.6	%	5.00	1.5	%	39.10	%	$	8.14
April 21, 2009	1.9	%	5.00	1.0	%	38.80	%	$	3.64

Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share

The following tables present a reconciliation of the denominators used in the computation of basic and diluted earnings per share and a summary of the options to purchase shares of common stock which were excluded from the diluted earnings per share calculation because they were anti-dilutive:

	Nine-month Period		Three-month Period
Reconciliation	2017	2016	2017	2016
Basic weighted average shares outstanding	288,451,470	288,907,934	287,456,943	288,995,492
Weighted shares assumed upon exercise of stock options	140,104	227,908	121,100	154,114
Diluted weighted average shares outstanding	288,591,574	289,135,842	287,578,043	289,149,606

Anti-Dilutive Options Excluded

	Nine-month Period			Three-month Period
Summary of Anti-dilutive Options Excluded	2017		2016	2017		2016
Options to purchase shares of common stock	3,881,605		3,061,217	3,848,126		3,335,439
Weighted average exercise price of options	$	49.21	50.17	$	49.18	49.67

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Debt Commitments (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of Debt Obligations and Letters of Credit Outstanding

Debt obligations and letters of credit outstanding at the end of each period consisted of the following:

	September 30, 2017			December 31, 2016
Outstanding loans under unsecured revolving credit facility	$	300.0		305.0
2.00% senior unsecured promissory note payable	40.0			40.0
2.45% senior unsecured promissory note payable	35.0			35.0
3.22% senior unsecured promissory note payable	60.0			—
Note payable under asset purchase agreement	5.0			10.0
Total debt	440.0			390.0
Less: Current portion of debt	(8.0		)	(10.5	)
Long-term debt	$	432.0		379.5
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation	$	36.3		36.3

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Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits from stock-based compensation	$ 0.0	$ 0.5
Reclassification offsetting cash flows used in financing activities		301.2	$ 214.4
Reclassification to cash flows provided by operating activities		$ 455.9	386.9
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification offsetting cash flows used in financing activities			5.5
Reclassification to cash flows provided by operating activities			$ 5.5

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Acquisition - Additional Information (Details) - USD ($)		6 Months Ended	9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2017
Senior Notes [Member] | 3.22% Senior Unsecured Promissory Note Payable [Member]
Business Acquisition [Line Items]
Debt issuance, aggregate principal amount	$ 60,000,000	$ 60,000,000	$ 60,000,000
Manufacturers Supply Company [Member]
Business Acquisition [Line Items]
Purchase price paid in cash at closing	$ 57,900,000
Purchase price paid in cash after closing		800,000
Maximum contingent consideration arrangement		2,500,000	2,500,000
Fair value of contingent consideration arrangement		$ 600,000	600,000
Total consideration including fair value of contingent consideration arrangement			$ 59,300,000

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Acquisition - Fair Value Allocation for Assets Acquired and Liabilities Assumed (Details) - Manufacturers Supply Company [Member] $ in Millions	Mar. 31, 2017 USD ($)
Business Acquisition [Line Items]
Current assets	$ 21.7
Property and equipment	0.9
Identifiable intangible assets	20.1
Current liabilities	(1.8)
Total identifiable net assets	40.9
Goodwill	18.4
Total fair value of assets acquired and liabilities assumed	$ 59.3

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Acquisition - Pro Forma Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Actual sales and earnings
Net sales	$ 1,132.8	$ 1,013.1	$ 3,302.0	$ 3,014.1
Net earnings	143.1	126.9	426.2	384.6
Manufacturers Supply Company [Member]
Business Acquisition [Line Items]
Net sales		12.7	40.4	36.7
Net earnings		$ 1.2	$ 4.6	$ 3.7
Actual sales and earnings
Net sales	13.4
Net earnings	$ 1.4

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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Oct. 10, 2017	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Options vesting and exercisable period, maximum		8 years
Options termination period		9 years
Total stock-based compensation expense		$ 4.0	$ 2.9
Total unrecognized stock-based compensation expense		$ 15.9
Weighted average period over which total unrecognized stock-based compensation expense will be recognized		4 years 4 months 13 days
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividend declared (in dollars per share)	$ 0.32

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Stockholders' Equity - Schedule of Dividends Paid Previously or Declared (Details) - $ / shares	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Dividends Per Share [Line Items]
Dividends paid (in dollars per share)		$ 0.32	$ 0.32	$ 0.32	$ 0.30	$ 0.30	$ 0.30	$ 0.30		$ 1.20
Forecast [Member]
Dividends Per Share [Line Items]
Dividends paid (in dollars per share)	$ 0.32								$ 1.28

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Stockholders' Equity - Stock Options Granted (Details)	101 Months Ended
	Sep. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	6,628,449
Options Outstanding (in shares)	4,220,498
Options Exercisable (in shares)	1,301,603
January 3, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	764,789
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 47.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 46.95
Options Outstanding (in shares)	725,542
Options Exercisable (in shares)	0
April 19, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	845,440
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 46.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 45.74
Options Outstanding (in shares)	757,522
Options Exercisable (in shares)	0
April 21, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	893,220
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 42.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 41.26
Options Outstanding (in shares)	700,746
Options Exercisable (in shares)	0
April 22, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	955,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 56.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 50.53
Options Outstanding (in shares)	572,500
Options Exercisable (in shares)	116,250
April 16, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	205,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 54.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 49.25
Options Outstanding (in shares)	104,250
Options Exercisable (in shares)	57,250
April 17, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	1,235,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 54.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 49.01
Options Outstanding (in shares)	957,938
Options Exercisable (in shares)	776,103
April 19, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	410,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 35.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 31.78
Options Outstanding (in shares)	72,550
Options Exercisable (in shares)	47,550
April 20, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	530,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 30.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 27.13
Options Outstanding (in shares)	107,800
Options Exercisable (in shares)	82,800
April 21, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Granted (in shares)	790,000
Option Exercise (Strike) Price (in dollars per share) | $ / shares	$ 27.00
Closing Stock Price on Date of Grant (in dollars per share) | $ / shares	$ 17.61
Options Outstanding (in shares)	221,650
Options Exercisable (in shares)	221,650

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Stockholders' Equity - Fair Value Assumptions for Options Granted (Details)	9 Months Ended
	Sep. 30, 2017 $ / shares
January 3, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	1.90%
Expected Life of Option in Years	5 years
Expected Dividend Yield	2.60%
Expected Stock Volatility	24.49%
Estimated Fair Value of Stock Option (in dollars per share)	$ 8.40
April 19, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	1.30%
Expected Life of Option in Years	5 years
Expected Dividend Yield	2.60%
Expected Stock Volatility	26.34%
Estimated Fair Value of Stock Option (in dollars per share)	$ 8.18
April 21, 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	1.30%
Expected Life of Option in Years	5 years
Expected Dividend Yield	2.70%
Expected Stock Volatility	26.84%
Estimated Fair Value of Stock Option (in dollars per share)	$ 7.35
April 22, 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	1.80%
Expected Life of Option in Years	5 years
Expected Dividend Yield	2.00%
Expected Stock Volatility	28.55%
Estimated Fair Value of Stock Option (in dollars per share)	$ 9.57
April 16, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	0.70%
Expected Life of Option in Years	5 years
Expected Dividend Yield	1.60%
Expected Stock Volatility	37.42%
Estimated Fair Value of Stock Option (in dollars per share)	$ 12.66
April 17, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	0.90%
Expected Life of Option in Years	5 years
Expected Dividend Yield	1.40%
Expected Stock Volatility	39.25%
Estimated Fair Value of Stock Option (in dollars per share)	$ 13.69
April 19, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	2.10%
Expected Life of Option in Years	5 years
Expected Dividend Yield	1.60%
Expected Stock Volatility	39.33%
Estimated Fair Value of Stock Option (in dollars per share)	$ 11.20
April 20, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	2.60%
Expected Life of Option in Years	5 years
Expected Dividend Yield	1.50%
Expected Stock Volatility	39.10%
Estimated Fair Value of Stock Option (in dollars per share)	$ 8.14
April 21, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free Interest Rate	1.90%
Expected Life of Option in Years	5 years
Expected Dividend Yield	1.00%
Expected Stock Volatility	38.80%
Estimated Fair Value of Stock Option (in dollars per share)	$ 3.64

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Stockholders' Equity - Reconciliation of Denominators used in Computation of Basic and Diluted Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Basic weighted average shares outstanding (in shares)	287,456,943	288,995,492	288,451,470	288,907,934
Weighted shares assumed upon exercise of stock options (in shares)	121,100	154,114	140,104	227,908
Diluted weighted average shares outstanding (in shares)	287,578,043	289,149,606	288,591,574	289,135,842

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Stockholders' Equity - Summary of Anti-Dilutive Options Excluded (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Options to purchase shares of common stock (in shares)	3,848,126	3,335,439	3,881,605	3,061,217
Weighted average exercise price of options (in dollars per share)	$ 49.18	$ 49.67	$ 49.21	$ 50.17

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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Liabilities recorded related to gross unrecognized tax benefits	$ 4.5	$ 5.3

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Operating Leases - Additional Information (Details) $ in Millions	Sep. 30, 2017 USD ($)
Leased Vehicles [Member]
Property Subject to or Available for Operating Lease [Line Items]
Aggregate residual value guarantee of pick-up leases	$ 78.7

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Debt Commitments - Debt Obligations and Letters of Credit Outstanding (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 440.0	$ 390.0
Less: Current portion of debt	(8.0)	(10.5)
Long-term debt	432.0	379.5
Credit Facility [Member] | Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	300.0	305.0
Credit Facility [Member] | Letter of Credit Subfacility [Member]
Debt Instrument [Line Items]
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation	36.3	36.3
Senior Unsecured Promissory Notes [Member] | 2.00% Senior Unsecured Promissory Note Payable [Member]
Debt Instrument [Line Items]
Total debt	$ 40.0	40.0
Fixed interest rate per annum	2.00%
Senior Unsecured Promissory Notes [Member] | 2.45% Senior Unsecured Promissory Note Payable [Member]
Debt Instrument [Line Items]
Total debt	$ 35.0	35.0
Fixed interest rate per annum	2.45%
Senior Unsecured Promissory Notes [Member] | 3.22% Senior Unsecured Promissory Note Payable [Member]
Debt Instrument [Line Items]
Total debt	$ 60.0	0.0
Fixed interest rate per annum	3.22%
Note Payable Under Asset Purchase Agreement [Member]
Debt Instrument [Line Items]
Total debt	$ 5.0	$ 10.0	$ 15.0
Fixed interest rate per annum	0.56%

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Debt Commitments - Unsecured Revolving Credit Facility (Details) - Credit Facility [Member]	9 Months Ended
	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Weighted per annum interest rate on outstanding line of credit	2.20%
Minimum [Member]
Debt Instrument [Line Items]
Percentage fee paid for unused portion of credit facility	0.10%
Maximum [Member]
Debt Instrument [Line Items]
Percentage fee paid for unused portion of credit facility	0.125%
LIBOR [Member]
Debt Instrument [Line Items]
Per annum interest rate over LIBOR	0.95%
Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 700,000,000
Letter of Credit Subfacility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 55,000,000

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Debt Commitments - Senior Unsecured Promissory Notes Payable (Details) - Senior Unsecured Promissory Notes [Member]	Jul. 20, 2016 USD ($)	Sep. 30, 2017 USD ($) debt_instrument_series	Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Debt issuance period after effective date	3 years
Maximum aggregate principal amount outstanding	$ 200,000,000
Number of debt instrument series | debt_instrument_series		3
Fixed Rate Notes Payable [Member]
Debt Instrument [Line Items]
Term of debt (no later than 12 years)	12 years
Floating Rate Notes Payable [Member]
Debt Instrument [Line Items]
Term of debt (no later than 12 years)	10 years
2.00% Senior Unsecured Promissory Note Payable [Member]
Debt Instrument [Line Items]
Debt issuance, aggregate principal amount		$ 40,000,000
Fixed interest rate per annum		2.00%
2.45% Senior Unsecured Promissory Note Payable [Member]
Debt Instrument [Line Items]
Debt issuance, aggregate principal amount		$ 35,000,000
Fixed interest rate per annum		2.45%
3.22% Senior Unsecured Promissory Note Payable [Member]
Debt Instrument [Line Items]
Debt issuance, aggregate principal amount		$ 60,000,000	$ 60,000,000
Fixed interest rate per annum		3.22%

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Debt Commitments - Note Payable Under Asset Purchase Agreement (Details) - USD ($) $ in Millions		1 Months Ended
	Dec. 07, 2015	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2017
Debt Instrument [Line Items]
Consideration for Apex asset purchase agreement	$ 27.0
Cash paid for asset purchase agreement			$ 5.0	$ 5.0	$ 12.0
Debt				390.0		$ 440.0
Note Payable Under Asset Purchase Agreement [Member]
Debt Instrument [Line Items]
Debt				$ 10.0	$ 15.0	$ 5.0
Fixed interest rate per annum						0.56%
Scenario, Forecast [Member]
Debt Instrument [Line Items]
Cash paid for asset purchase agreement		$ 5.0