10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

þQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2015

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 001-31921

Compass Minerals International, Inc.

(Exact name of registrant as specified in its charter)

Delaware	36-3972986
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

9900 West 109th Street

Suite 100

Overland Park, KS 66210

(913) 344-9200

(Address of principal executive offices, zip code and telephone number, including area code)

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: þ     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: þ     No:  ¨

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

Large accelerated filer þ Accelerated filer ¨ Non-accelerated filer ¨ Smaller reporting company ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes: ¨     No: þ

The number of shares outstanding of the registrant’s common stock, $0.01 par value per share, at October 23, 2015 was 33,701,533 shares.

COMPASS MINERALS INTERNATIONAL, INC.

TABLE OF CONTENTS

		Page
	PART I.  FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets as of September 30, 2015 (unaudited) and December 31, 2014	2
	Consolidated Statements of Operations for the three and nine months ended September 30, 2015 and 2014 (unaudited)	3
	Consolidated Statements of Comprehensive Income (Loss) for the three and nine months ended September 30, 2015 and 2014 (unaudited)	4
	Consolidated Statement of Stockholders’ Equity for the nine months ended September 30, 2015 (unaudited)	5
	Consolidated Statements of Cash Flows for the nine months ended September 30, 2015 and 2014 (unaudited)	6
	Notes to Consolidated Financial Statements (unaudited)	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	28
Item 4.	Controls and Procedures	29
	PART II.  OTHER INFORMATION
Item 1.	Legal Proceedings	29
Item 1A.	Risk Factors	29
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	29
Item 3.	Defaults Upon Senior Securities	29
Item 4.	Mine Safety Disclosures	29
Item 5.	Other Information	29
Item 6.	Exhibits	29
SIGNATURES		30
EXHIBIT INDEX		31

1

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

COMPASS MINERALS INTERNATIONAL, INC.

CONSOLIDATED BALANCE SHEETS

(in millions, except share data)

	(Unaudited)
	September 30, 2015			December 31, 2014
ASSETS
Current assets:
Cash and cash equivalents	$	119.1		$	266.8
Receivables, less allowance for doubtful accounts of $1.4in 2015 and 2014	138.1			213.0
Inventories	268.7			199.0
Deferred income taxes, net	8.4			9.7
Other	19.9			14.2
Total current assets	554.2			702.7
Property, plant and equipment, net	762.9			700.9
Intangible assets, net	93.6			106.2
Goodwill	60.0			68.5
Other	58.0			58.9
Total assets	$	1,528.7		$	1,637.2
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Current portion of long-term debt	$	3.9		$	3.9
Accounts payable	77.9			97.6
Accrued expenses	65.8			60.6
Accrued salaries and wages	19.9			24.4
Income taxes payable	5.5			44.4
Accrued interest	3.0			6.8
Total current liabilities	176.0			237.7
Long-term debt, net of current portion	619.6			622.5
Deferred income taxes, net	81.7			88.9
Other noncurrent liabilities	31.4			34.5
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock:  $0.01 par value, 200,000,000 authorized shares; 35,367,264 issued shares	0.4			0.4
Additional paid-in capital	89.9			82.5
Treasury stock, at cost — 1,669,346 shares at September 30, 2015 and 1,757,997 shares at December 31, 2014	(3.2		)	(3.3		)
Retained earnings	623.1			589.5
Accumulated other comprehensive loss	(90.2		)	(15.5		)
Total stockholders' equity	620.0			653.6
Total liabilities and stockholders' equity	$	1,528.7		$	1,637.2

The accompanying notes are an integral part of the consolidated financial statements.

2

COMPASS MINERALS INTERNATIONAL, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited, in millions, except share and per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Sales	$	232.7		$	240.5		$	809.4		$	849.1
Shipping and handling cost	53.2			57.5			195.9			233.0
Product cost (Note 2)	111.5			33.2			381.7			336.5
Gross profit	68.0			149.8			231.8			279.6
Selling, general and administrative expenses	27.2			26.8			82.3			76.2
Operating earnings	40.8			123.0			149.5			203.4
Other (income) expense:
Interest expense	5.4			5.5			16.1			14.4
Other, net	(4.3		)	(3.1		)	(9.0		)	0.9
Earnings before income taxes	39.7			120.6			142.4			188.1
Income tax expense	12.7			32.7			41.6			50.7
Net earnings	$	27.0		$	87.9		$	100.8		$	137.4
Basic net earnings per common share	$	0.80		$	2.60		$	2.98		$	4.07
Diluted net earnings per common share	$	0.80		$	2.60		$	2.97		$	4.07
Weighted-average common shares outstanding (in thousands):
Basic	33,696			33,575			33,668			33,542
Diluted	33,708			33,601			33,687			33,566
Cash dividends per share	$	0.66		$	0.60		$	1.98		$	1.80

The accompanying notes are an integral part of the consolidated financial statements.

3

COMPASS MINERALS INTERNATIONAL, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited, in millions)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Net earnings	$	27.0		$	87.9		$	100.8		$	137.4
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.1) and $(0.2) in the three and nine months ended September 30, 2015, respectively, and $(0.1) and $(0.3) in the three and nine months ended September 30, 2014, respectively	0.2			0.3			0.8			0.9
Unrealized gain (loss) on cash flow hedges, net of tax of $0.1 and $(0.3) in the three and nine months ended September 30, 2015, respectively, and $0.3 and $0.2 in the three and nine months ended September 30, 2014, respectively	—			(0.5		)	0.5			(0.4		)
Cumulative translation adjustment	(37.4		)	(28.4		)	(76.0		)	(25.0		)
Comprehensive income (loss)	$	(10.2	)	$	59.3		$	26.1		$	112.9

The accompanying notes are an integral part of the consolidated financial statements.

4

COMPASS MINERALS INTERNATIONAL, INC.

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY

For the nine months ended September 30, 2015

(Unaudited, in millions)

	Common Stock		Additional Paid-In Capital		Treasury Stock			Retained Earnings			Accumulated Other Comprehensive Loss			Total
Balance, December 31, 2014	$	0.4	$	82.5	$	(3.3	)	$	589.5		$	(15.5	)	$	653.6
Dividends on common stock/equity awards			0.2					(67.2		)				(67.0		)
Stock options exercised			2.2		0.1									2.3
Income tax benefit from equity awards			0.1											0.1
Stock-based compensation			4.9											4.9
Comprehensive income (loss)								100.8			(74.7		)	26.1
Balance, September 30, 2015	$	0.4	$	89.9	$	(3.2	)	$	623.1		$	(90.2	)	$	620.0

The accompanying notes are an integral part of the consolidated financial statements.

5

COMPASS MINERALS INTERNATIONAL, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, in millions)

	Nine Months Ended September 30,
	2015			2014
Cash flows from operating activities:
Net earnings	$	100.8		$	137.4
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation, depletion and amortization	57.8			57.2
Finance fee amortization	0.9			0.9
Early extinguishment of debt	—			6.9
Stock-based compensation	4.9			3.7
Deferred income taxes	1.2			13.0
Gain from insurance settlement	—			(83.3		)
Other, net	2.6			(0.3		)
Insurance receipts for operating purposes, Goderich tornado	—			11.9
Changes in operating assets and liabilities, net of acquisition:
Receivables	70.1			64.0
Inventories	(78.2		)	(38.1		)
Other assets	(11.7		)	(11.3		)
Accounts payable and accrued expenses	(54.0		)	(32.1		)
Other liabilities	0.7			(0.2		)
Net cash provided by operating activities	95.1			129.7
Cash flows from investing activities:
Capital expenditures	(154.4		)	(83.5		)
Acquisition of business	—			(86.5		)
Insurance receipts for investment purposes, Goderich tornado	—			19.4
Other, net	(0.9		)	3.1
Net cash used in investing activities	(155.3		)	(147.5		)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	—			250.0
Principal payments on long-term debt	(2.9		)	(101.4		)
Premium and other payments to refinance debt	—			(5.5		)
Deferred financing costs	—			(4.1		)
Dividends paid	(67.0		)	(60.6		)
Proceeds received from stock option exercises	2.3			6.1
Excess tax benefit (deficiency) from equity compensation awards	0.1			(0.2		)
Net cash provided by (used in) financing activities	(67.5		)	84.3
Effect of exchange rate changes on cash and cash equivalents	(20.0		)	(6.1		)
Net change in cash and cash equivalents	(147.7		)	60.4
Cash and cash equivalents, beginning of the year	266.8			159.6
Cash and cash equivalents, end of period	$	119.1		$	220.0

Supplemental cash flow information:
Interest paid, net of amounts capitalized	$	18.6	$	10.8
Income taxes paid, net of refunds	$	83.5	$	33.2

In connection with the acquisition of Wolf Trax Inc., the Company assumed liabilities as follows (in millions):

Fair value of assets acquired	$	99.2
Cash paid during the nine months ended September 30, 2014	(86.5		)
Liabilities assumed	$	12.7

The accompanying notes are an integral part of the consolidated financial statements.

6

COMPASS MINERALS INTERNATIONAL, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Accounting Policies and Basis of Presentation:

Compass Minerals International, Inc., through its subsidiaries, is a producer and marketer of essential mineral products with manufacturing sites in North America and the United Kingdom (“U.K.”). References to the “Company,” “Compass,” “Compass Minerals,” “CMP,” “we,” “us” and “our” refer to Compass Minerals International, Inc. (“CMI”, the parent holding company) and its consolidated subsidiaries. The Company’s principal products are salt, consisting of sodium chloride and magnesium chloride, and sulfate of potash (“SOP”), a specialty fertilizer the Company markets under the trade name Protassium+™.  Additionally, the Company sells various premium micronutrient products under its Wolf Trax® brand.  The Company provides highway deicing products to customers in North America and the U.K., and plant nutrients to growers and fertilizer distributors worldwide.  The Company also produces and markets consumer deicing and water conditioning products, ingredients used in consumer and commercial food preparation, and other mineral-based products for consumer, agricultural and industrial applications.  Compass Minerals also provides records management services to businesses located in the U.K.

CMP is a holding company with no operations other than those of its wholly-owned subsidiaries.  The consolidated financial statements include the accounts of CMP and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of CMP for the year ended December 31, 2014 as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring accruals considered necessary for a fair presentation, have been included.

The Company experiences a substantial amount of seasonality in salt segment sales, primarily with respect to its deicing products. As a result, sales and operating income are generally higher in the first and fourth quarters and lower during the second and third quarters of each year.  In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the product is used. Following industry practice in North America and the U.K., the Company seeks to stockpile sufficient quantities of deicing salt throughout the second, third and fourth quarters to meet the estimated requirements for the upcoming winter season. Production of deicing salt can vary based on the severity or mildness of the preceding winter season.  Due to the seasonal nature of the deicing product lines, operating results for the interim periods are not necessarily indicative of the results that may be expected for the full year.

Recent Accounting Pronouncements – In July 2015, the Financial Accounting Standards Board ("FASB") issued guidance that requires entities to measure inventory within the scope of the standard at the lower of cost or net realizable value. "Net realizable value" is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early adoption is permitted. The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In April 2015, the FASB issued guidance about whether fees paid by customers in cloud computing arrangements include a software license.  If a cloud computing arrangement includes a software license, a customer should account for the software license element in a manner consistent with previously issued guidance for software licenses.  If the arrangement does not include a software license, a customer should account for the arrangement as a service contract.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015.  An entity can adopt the guidance prospectively or retrospectively and early adoption is permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In April 2015, the FASB issued guidance which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the related debt liability rather than an asset.  The recognition and measurement guidance for debt issuance costs are not affected by this guidance.  This new guidance is effective retrospectively for fiscal years, and interim periods within those years, beginning after December 15, 2015.  Early adoption is permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

7

In August 2014, the FASB issued guidance which requires management to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide disclosure in the footnotes under certain circumstances.  This guidance is effective for fiscal years ending after December 15, 2016 with early adoption permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers.  The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services.  This guidance is effective for fiscal years and interim periods with those years beginning after December 15, 2017 and early adoption is not permitted.  The guidance permits the use of either a full or modified retrospective or cumulative effect transition method.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.

2. Goderich Tornado:

In August 2011, a tornado struck the Company’s salt mine and its salt mechanical evaporation plant, both located in Goderich, Ontario, Canada. There was no damage to the underground operations at the mine. However, some of the mine’s surface structures and the evaporation plant incurred significant damage which temporarily ceased production at both facilities. Both facilities resumed normal production and shipping activities in 2012.

The Company recorded impairment of its property, plant and equipment and clean-up and restoration costs during 2011 through 2013 related to the impacted areas at both of the Goderich facilities. There were no material expenses or charges related to the tornado in 2014. In the third quarter of 2014, the Company resolved all contingencies and settled its insurance claim. The settlement included a substantial amount related to business interruption losses. Cumulatively, the Company received $114.9 million in cash, including approximately $28.6 million received in 2014 which was originally recorded as deferred revenue in the Company’s consolidated balance sheets. The insurance proceeds included approximately $26.9 million related to clean-up and restoration costs and asset impairment charges and approximately $83.3 million of proceeds for the replacement of property, plant and equipment and business interruption losses. In connection with the settlement, the Company released its deferred revenue balance of $83.3 million and recorded a gain of $82.3 million as a reduction to product cost and approximately $1.0 million as a reduction to selling, general and administrative expenses in its consolidated statements of operations for the third quarter of 2014. The difference between the cash received and the amounts recorded above relates to the foreign exchange impact from translating amounts from Canadian dollars to U.S. dollars.

3. Inventories:

Inventories consist of the following (in millions):

	September 30, 2015		December 31, 2014
Finished goods	$	218.1	$	148.5
Raw materials and supplies	50.6		50.5
Total inventories	$	268.7	$	199.0

8

4. Property, Plant and Equipment, Net:

Property, plant and equipment, net consists of the following (in millions):

	September 30, 2015			December 31, 2014
Land, buildings and structures and leasehold improvements	$	347.3		$	352.2
Machinery and equipment	696.7			669.1
Office furniture and equipment	19.6			17.5
Mineral interests	171.7			179.6
Construction in progress	164.2			108.9
	1,399.5			1,327.3
Less accumulated depreciation and depletion	(636.6		)	(626.4		)
Property, plant and equipment, net	$	762.9		$	700.9

5. Goodwill and Intangible Assets, Net:

The estimated lives of the Company’s intangible assets are as follows:

Intangible asset	Estimated Lives
Supply agreement	50 years
SOP production rights	25 years
Patents	10-20 years
Developed technology	5 years
Lease rights	25 years
Customer and distributor relationships	10 years
Trademarks	10 years
Noncompete agreements	5 years
Trade names	Indefinite
Water rights	Indefinite

None of the finite-lived intangible assets have a residual value. Aggregate amortization expense was $1.0 million and $1.3 million in the third quarters of 2015 and 2014, respectively, and $3.3 million and $3.1 million in the first nine months of 2015 and 2014, respectively.

The Company has goodwill of $60.0 million and $68.5 million as of September 30, 2015 and December 31, 2014 in its consolidated balance sheets.  Approximately $53.6 million and $62.0 million of the amounts recorded for goodwill as of September 30, 2015 and December 31, 2014, respectively, were recorded in the Company’s plant nutrition segment and the remaining amounts in both periods were immaterial and recorded in its salt segment and corporate and other.  The change in goodwill from December 31, 2014 was due to the impact from translating foreign-denominated amounts to U.S. dollars.

6. Income Taxes:

The Company’s effective income tax rate differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, state income taxes (net of federal tax benefit), foreign income tax rate differentials, foreign mining taxes, domestic manufacturing deductions, and interest expense recognition differences for book and tax purposes.  The Company’s effective rate is impacted by permanent tax deductions which have a less favorable impact as pretax income increases.

At both September 30, 2015 and December 31, 2014, the Company had approximately $3.8 million of gross foreign federal net operating loss (“NOL”) carryforwards that have no expiration date.  In addition, the Company had $8.0 million and $2.3 million as of September 30, 2015 and December 31, 2014, respectively, of gross foreign federal NOL carryforwards which expire beginning in 2033 and $1.0 million and $0.3 million as of September 30, 2015 and December 31, 2014, respectively, of tax-effected state NOL carryforwards which expire beginning in 2033. In the future, if the Company determines, based on the existence of sufficient

9

evidence, that it should realize more or less of its deferred tax assets, an adjustment to any existing valuation allowance will be made in the period such determination is made.

Canadian provincial tax authorities have challenged tax positions claimed by one of the Company’s Canadian subsidiaries and have issued tax reassessments for years 2002-2009.  The reassessments are a result of ongoing audits and total approximately $80 million, including interest through September 30, 2015.  The Company disputes these reassessments and plans to continue to work with the appropriate authorities in Canada to resolve the dispute.  There is a reasonable possibility that the ultimate resolution of this dispute, and any related disputes for other open tax years, may be materially higher or lower than the amounts the Company has reserved for such disputes.  In connection with this dispute, local regulations require the Company to post security with the tax authority until the dispute is resolved.  The Company and the tax authority have agreed that it will post collateral in the form of a $50 million performance bond.  The Company has paid approximately $28 million (most of which is recorded in other assets in the consolidated balance sheets) with the remaining balance to be paid after 2015. 

In addition, Canadian federal and provincial taxing authorities have reassessed the Company for years 2004-2006 which have been previously settled by agreement among the Company, the Canadian federal taxing authority and the U.S. federal taxing authority.  The Company has fully complied with the agreement since entering into it and it believes this action is highly unusual.  The Company is seeking to enforce the agreement which provided the basis upon which the returns were previously filed and settled.  The total amount of the reassessments, including penalties and interest through September 30, 2015, related to this matter is approximately $89 million.  The Company has agreed to post collateral in the form of an approximately $18 million performance bond and $36 million in the form of a bank letter guarantee which is necessary to proceed with future appeals or litigation.

The Company received Canadian income tax reassessments for years 2007-2008.  The total amount of the reassessments, including penalties and interest through September 30, 2015, related to this matter is approximately $31 million.  The Company does not agree with these adjustments and has filed for assistance from the tax jurisdictions for relief from the impact of double taxation as available in the tax treaty between the U.S. and Canada.  The Company has filed protective Notices of Objection and has agreed to post collateral of an approximately $10 million performance bond and $10 million in the form of a bank letter guarantee which is necessary to proceed with future appeals or litigation.  Although the outcome of examinations by taxing authorities is uncertain, the Company believes it has adequately reserved for this matter.

The Company will be required by the same local regulations to provide security for additional interest on the above disputed amounts and for any future reassessments issued by these Canadian tax authorities in the form of cash, letters of credit, performance bonds, asset liens or other arrangements agreeable with the tax authorities until the dispute is resolved.

The Company expects that the ultimate outcome of these matters will not have a material impact on its results of operations or financial condition. However, the Company can provide no assurance as to the ultimate outcome of these matters and the impact could be material if they are not resolved in the Company’s favor.  As of September 30, 2015, the amount reserved related to these reassessments was immaterial to the Company’s consolidated financial statements.

Additionally, the Company has other uncertain tax positions as well as assessments and disputed positions with taxing authorities in its various jurisdictions.

7. Long-term Debt:

Long-term debt consists of the following (in millions):

	September 30, 2015			December 31, 2014
Term Loan due May 2017	$	373.5		$	376.4
Revolving Credit Facility due August 2017	—			—
4.875% Senior Notes due July 2024	250.0			250.0
	623.5			626.4
Less current portion	(3.9		)	(3.9		)
Long-term debt	$	619.6		$	622.5

The term loan and revolving credit facility are secured by substantially all existing and future assets of the Company’s subsidiaries.

10

8. Commitments and Contingencies:

The Company is involved in legal and administrative proceedings and claims of various types from normal Company activities.

The Company is aware of an aboriginal land claim filed in 2003 by The Chippewas of Nawash and The Chippewas of Saugeen (the “Chippewas”) in the Ontario Superior Court against The Attorney General of Canada and Her Majesty The Queen In Right of Ontario. The Chippewas claim that a large part of the land under Lake Huron was never surrendered by treaty and thus seek a declaration that the Chippewas hold aboriginal title to those submerged lands.  The land to which aboriginal title is claimed includes land under which the Company’s Goderich mine operates and has mining rights granted to it by the government of Ontario. The actions also seek damages for the value and loss of use of lands.  The Company is not a party to the court actions. The Company understands that the Canadian and Ontario governments are defending the actions for aboriginal title on the basis, among other things, that common law does not recognize aboriginal title to the Great Lakes and other navigable waterways.

Similar claims are pending with respect to other parts of the Great Lakes by other aboriginal claimants. The Company has been informed by the Ministry of The Attorney General of Ontario that “Canada takes the position that the common law does not recognize aboriginal title to the Great Lakes and its connecting waterways.”

The Company is involved in proceedings alleging unfair labor practices at its Cote Blanche, Louisiana, mine.  This matter arises out of a labor dispute between the Company and the United Steelworkers Union over the terms of a new contract for certain employees at the mine. These employees initiated a strike that began on April 7, 2010, and ended on June 15, 2010.  In September 2012, the U.S. National Labor Relations Board issued a decision finding that the Company had committed unfair labor practices in connection with the labor dispute.  Under the ruling, the Company is responsible for back pay to affected employees as a result of changes made in union work rules and past practices beginning April 1, 2010.  Any requirement for the Company to pay back wages will be offset by any wages earned at other places of employment during this period.  In the fourth quarter of 2013, this ruling was upheld by an appeals court and the Company recorded a reserve of approximately $5 million in its consolidated financial statements related to expected payments required to resolve the dispute.

In the first quarter of 2015, additional information became available and the Company recorded an additional $2 million reserve for this matter in its consolidated financial statements.  Both parties are currently negotiating in an effort to reach a settlement. If the Company is unable to come to terms with the union, the parties may agree to arbitration and any decisions reached in arbitration would be binding.  The Company may need to record additional losses in its financial statements as a result of future developments.

The Wisconsin Department of Agriculture, Trade and Consumer Protection (“DATCP”) has information indicating that agricultural chemicals are present within the subsurface area of the Kenosha, Wisconsin plant. The agricultural chemicals were used by previous owners and operators of the site.  None of the identified chemicals have been used in association with Compass Minerals’ operations since it acquired the property in 2002.  DATCP directed the Company to conduct further investigations into the possible presence of agricultural chemicals in soil and ground water at the Kenosha plant.  The Company has completed such investigations of the soils and ground water and has provided the findings to DATCP. The Company is presently proceeding with select remediation activities to mitigate agricultural chemical impact to soils and ground water at the site.  All investigations and mitigation activities to date, and any potential future remediation work, are being conducted under the Wisconsin Agricultural Chemical Cleanup Program (“ACCP”), which would provide for reimbursement of some of the costs. The Company may seek participation by, or cost reimbursement from, the parties responsible for the presence of any agricultural chemicals found in soil and ground water at this site if the Company does not receive an acknowledgment of no further action and is required to conduct further investigation or remedial work that may not be eligible for reimbursement under the ACCP.

The Company does not believe that these actions will have a material adverse financial effect on the Company. Furthermore, while any litigation contains an element of uncertainty, management presently believes that the outcome of each such proceeding or claim, which is pending or known to be threatened, or all of them combined, will not have a material adverse effect on the Company’s results of operations, cash flows or financial position.

9. Operating Segments:

The Company broadened its portfolio of specialty plant nutrient products with the acquisition of Wolf Trax Inc. (renamed Compass Minerals Manitoba, Inc. or “Compass Manitoba”) in the second quarter of 2014.  This acquisition expands the Company’s portfolio of specialty crop nutrient products and further differentiates it from commodity fertilizers.  The results of operations and financial position for Compass Manitoba have been included in the Company’s plant nutrition segment from the date of the acquisition.  Segment information is as follows (in millions):

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	Three Months Ended September 30, 2015
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	179.9	$	50.2	$	2.6		$	232.7
Intersegment sales	—		1.6		(1.6		)	—
Shipping and handling cost	48.5		4.7		—			53.2
Operating earnings (loss)	45.0		8.8		(13.0		)	40.8
Depreciation, depletion and amortization	11.1		7.6		0.9			19.6
Total assets (as of end of period)	898.2		568.9		61.6			1,528.7

	Three Months Ended September 30, 2014
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	175.4	$	62.7	$	2.4		$	240.5
Intersegment sales	0.3		1.5		(1.8		)	—
Shipping and handling cost	51.6		5.9		—			57.5
Operating earnings (loss) (b)	116.7		19.0		(12.7		)	123.0
Depreciation, depletion and amortization	11.4		7.1		1.5			20.0
Total assets (as of end of period)	970.1		517.7		58.7			1,546.5

	Nine Months Ended September 30, 2015
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	612.9	$	187.9	$	8.6		$	809.4
Intersegment sales	0.1		5.1		(5.2		)	—
Shipping and handling cost	178.1		17.8		—			195.9
Operating earnings (loss)	143.1		46.4		(40.0		)	149.5
Depreciation, depletion and amortization	32.9		21.7		3.2			57.8

	Nine Months Ended September 30, 2014
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	647.3	$	194.4	$	7.4		$	849.1
Intersegment sales	0.7		4.7		(5.4		)	—
Shipping and handling cost	211.7		21.3		—			233.0
Operating earnings (loss) (b)	187.0		53.2		(36.8		)	203.4
Depreciation, depletion and amortization	33.5		20.0		3.7			57.2

(a) Corporate and Other includes corporate entities, records management operations and other incidental operations and eliminations.  Operating earnings (loss) for corporate and other includes indirect corporate overhead including costs for general corporate governance and oversight, as well as costs for the human resources, information technology and finance functions.

(b) Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.

10. Stockholders' Equity and Equity Instruments:

In the first nine months of 2015, the Company granted 120,956 stock options, 19,492 restricted stock units (“RSUs”) and 35,584 performance stock units (“PSUs”) to certain employees under its 2005 Incentive Award Plan.  The Company’s closing stock price on the grant date was used to set the exercise price for the options and the fair value of the RSUs.  The options vest ratably on

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each anniversary date over a four-year service period. Unexercised options expire after seven years. The RSUs vest on the third anniversary following the grant date. None of the awards granted have voting rights.  The RSUs granted entitle the holders to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock for RSUs earned.  In May 2015, the Company’s shareholders approved the 2015 Incentive Award Plan, which authorizes the issuance of 3,000,000 shares.  Since the date the 2015 Incentive Award Plan was approved, the Company ceased issuing equity awards under the 2005 Incentive Award Plan.

The PSUs granted in the first nine months of 2015 have a three-year performance period beginning in 2015 and ending in 2017 and earn units of between 0% and 150% based upon the attainment of certain performance conditions.  The Company granted two types of PSUs in the first nine months of 2015.  The total shareholder return PSU (“TSR PSU”) is earned by determining the Company’s total shareholder return, compared to the total shareholder return for each company comprising the Russell 3000 Index over the three-year performance period.  The return on invested capital PSU (“ROIC PSU”) is earned by averaging the Company’s annual return on invested capital over the three-year performance period.  The performance units will vest three years after the grant date.  The PSUs granted entitle the holders to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock from the grant date through the vest date for PSUs earned.

To estimate the fair value of options on the grant date, the Company uses the Black-Scholes option valuation model.  Award recipients are grouped according to expected exercise behavior. Unless better information is available to estimate the expected term of the options, the estimate is based on historical exercise experience. The risk-free rate, using U.S. Treasury yield curves in effect at the time of grant, is selected based on the expected term of each group. The Company’s historical stock price is used to estimate expected volatility.  The range of estimates and calculated fair values for options granted during the first nine months of 2015 is included in the table below. The weighted-average grant date fair value of these options was $14.78.

	Range
Fair value of options granted	$ 14.22 - $15.09
Exercise price	$ 91.75 - $93.26
Expected term (years)	4.5-5
Expected volatility	24.7% - 25.0%
Dividend yield	3.1%
Risk-free rate of return	1.3% - 1.6 %

To estimate the fair value of the TSR PSUs on the grant date, the Company uses a Monte-Carlo simulation model, which simulates future stock prices of the Company as well as the companies comprising the Russell 3000 Index.  This model uses historical stock prices to estimate expected volatility and the Company’s correlation to the Russell 3000 Index.  The risk-free rate was determined using the same methodology as the option valuations as discussed above. The estimated fair value of the TSR PSUs granted in 2015 is $111.07 per unit.  The Company’s closing stock price on the grant date was used to set the fair value of the ROIC PSUs.  The Company will adjust the expense of the ROIC PSUs based upon its estimate of the number of shares that will ultimately vest at each interim date during the three-year vesting period.

During the nine months ended September 30, 2015, the Company reissued 31,104 shares of treasury stock related to the exercise of stock options, 15,952 shares related to the release of RSUs which vested, 10,454 shares related to the release of PSUs which vested and 31,141 shares related to stock payments.  The Company recognized a tax benefit of $0.1 million from its equity compensation awards as an increase to additional paid-in capital during the first nine months of 2015. During the first nine months of 2015 and 2014, the Company recorded $4.9 million and $3.7 million, respectively, of compensation expense pursuant to its stock-based compensation plans.  No amounts have been capitalized. The following table summarizes stock-based compensation activity during the nine months ended September 30, 2015.

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	Stock Options				RSUs				PSUs(a)
	Number		Weighted-average exercise price		Number		Weighted-average fair value		Number		Weighted-average fair value
Outstanding at December 31, 2014	278,429		$	79.23	88,532		$	76.58	59,627		$	88.69
Granted	120,956		91.76		19,492		91.76		35,584		100.49
Exercised (b)	(31,104	)	72.20		—		—		—		—
Released from restriction (b)	—		—		(15,952	)	71.69		(10,454	)	74.49
Cancelled/Expired	(9,060	)	84.81		(2,188	)	81.56		(6,689	)	81.47
Outstanding at September 30, 2015	359,221		$	83.88	89,884		$	80.62	78,068		$	96.59

(a) Until they vest, PSUs are included in the table at the 100% attainment level at their grant date and at that level represent one share per unit.  The final performance period for the 2012 PSU grant was completed in 2014.  The Company issued 10,454 shares and cancelled 4,443 PSUs due to performance in the first quarter of 2015 related to the 2012 PSU grant.

(b) Common stock issued for exercised options and RSUs and PSUs released from restriction was issued from treasury stock.

Other Comprehensive Income (Loss)

The Company’s comprehensive income (loss) is comprised of net earnings, net amortization of the unrealized loss of the pension obligation, the change in the unrealized gain (loss) on natural gas cash flow hedges and foreign currency translation adjustments.  The components of and changes in accumulated other comprehensive income (loss) (“AOCI”) as of and for the three and nine months ended September 30, 2015 and 2014 are as follows (in millions):

Three Months Ended September 30, 2015 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	(1.5	)	$	(8.4	)	$	(43.1	)	$	(53.0	)
Other comprehensive income (loss) before reclassifications (b)	(0.3		)	—			(37.4		)	(37.7		)
Amounts reclassified from accumulated other comprehensive income (loss)	0.3			0.2			—			0.5
Net current period other comprehensive income (loss)	—			0.2			(37.4		)	(37.2		)
Ending balance	$	(1.5	)	$	(8.2	)	$	(80.5	)	$	(90.2	)

Three Months Ended September 30, 2014 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	0.4		$	(8.7	)	$	46.9		$	38.6
Other comprehensive income (loss) before reclassifications (b)	(0.5		)	—			(28.4		)	(28.9		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			0.3			—			0.3
Net current period other comprehensive income (loss)	(0.5		)	0.3			(28.4		)	(28.6		)
Ending balance	$	(0.1	)	$	(8.4	)	$	18.5		$	10.0

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Nine Months Ended September 30, 2015 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	(2.0	)	$	(9.0	)	$	(4.5	)	$	(15.5	)
Other comprehensive income (loss) before reclassifications (b)	(0.9		)	—			(76.0		)	(76.9		)
Amounts reclassified from accumulated other comprehensive income (loss)	1.4			0.8			—			2.2
Net current period other comprehensive income (loss)	0.5			0.8			(76.0		)	(74.7		)
Ending balance	$	(1.5	)	$	(8.2	)	$	(80.5	)	$	(90.2	)

Nine Months Ended September 30, 2014 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	0.3		$	(9.3	)	$	43.5		$	34.5
Other comprehensive income (loss) before reclassifications (b)	0.2			—			(25.0		)	(24.8		)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.6		)	0.9			—			0.3
Net current period other comprehensive income (loss)	(0.4		)	0.9			(25.0		)	(24.5		)
Ending balance	$	(0.1	)	$	(8.4	)	$	18.5		$	10.0

(a) With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.

(b) The Company recorded foreign exchange (gains) losses of approximately $13.0 million and $27.6 million in the three months and nine months ended September 30, 2015, respectively, and $10.4 million and $10.8 million in the three and nine months ended September 30, 2014, respectively, in accumulated other comprehensive income (loss) related to intercompany notes which were deemed to be of long-term investment nature.

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The amounts reclassified from AOCI to (income) expense for the three and nine months ended September 30, 2015 and 2014 are shown below (in millions):

	Amount Reclassified from AOCI
	Three Months Ended September 30, 2015			Nine Months Ended September 30, 2015			Line Item Impacted in the Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments	$	0.5		$	2.2		Product cost
	(0.2		)	(0.8		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.3			1.4
Amortization of defined benefit pension:
Amortization of loss	$	0.3		$	1.0		Product cost
	(0.1		)	(0.2		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.2			0.8
Total reclassifications, net of income taxes	$	0.5		$	2.2

	Amount Reclassified from AOCI
	Three Months Ended September 30, 2014			Nine Months Ended September 30, 2014			Line Item Impacted in the Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments	$	(0.1	)	$	(1.0	)	Product cost
	0.1			0.4			Income tax expense (benefit)
Reclassifications, net of income taxes	—			(0.6		)
Amortization of defined benefit pension:
Amortization of loss	$	0.4		$	1.2		Product cost
	(0.1		)	(0.3		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.3			0.9
Total reclassifications, net of income taxes	$	0.3		$	0.3

11. Derivative Financial Instruments:

The Company is subject to various types of market risks including interest rate risk, foreign currency exchange rate transaction and translation risk, and commodity pricing risk.  Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments.  Currently, the Company manages a portion of its commodity pricing risk by using derivative instruments.  The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangements. The Company has entered into natural gas derivative instruments with counterparties it views as creditworthy.  However, management does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with these counterparties.

Cash Flow Hedges

As of September 30, 2015, the Company has entered into natural gas derivative instruments. The Company records derivative financial instruments as either assets or liabilities at fair value in the consolidated statements of financial position.  Derivatives qualify for treatment as hedges when there is a high correlation between the change in fair value of the derivative instrument and the related change in value of the underlying hedged item. Depending on the exposure being hedged, the Company must designate the hedging instrument as a fair value hedge, a cash flow hedge or a net investment in foreign operations hedge.  All derivative instruments held by the Company as of September 30, 2015 and December 31, 2014 qualified as cash flow hedges. For these qualifying hedges, the effective portion of the change in fair value is recognized through earnings when the underlying transaction being hedged affects earnings, allowing a derivative’s gains and losses to offset related results from the hedged item in the statements of operations (see Note 10). For derivative instruments that are not accounted for as hedges, or for the ineffective portions of

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qualifying hedges, the change in fair value is recorded through earnings in the period of change. The Company formally documents, designates, and assesses the effectiveness of transactions that receive hedge accounting treatment initially and on an ongoing basis.  Any ineffectiveness related to these hedges was not material for any of the periods presented.

Natural gas is consumed at several of the Company’s production facilities, and a change in natural gas prices impacts the Company’s operating margin.  As of September 30, 2015, the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through December 2016.  The Company’s objective is to reduce the earnings and cash flow impacts of changes in market prices of natural gas by fixing the purchase price of up to 90% of its forecasted natural gas usage.  It is the Company’s policy to consider hedging portions of its natural gas usage up to 36 months in advance of the forecasted purchase. As of September 30, 2015 and December 31, 2014, the Company had agreements in place to hedge forecasted natural gas purchases of 1.9 million and 3.4 million MMBtus, respectively.

As of September 30, 2015, the Company expects to reclassify from accumulated other comprehensive loss to earnings during the next twelve months approximately $2.1 million of net losses on derivative instruments related to its natural gas hedges.

The following tables present the fair value of the Company’s hedged items as of September 30, 2015 and December 31, 2014, (in millions):

	Asset Derivatives			Liability Derivatives
Derivatives designated as hedging instruments(a) (b)	Balance Sheet Location	September 30, 2015		Balance Sheet Location	September 30, 2015
Commodity contracts	Other current assets	$	0.1	Accrued expenses	$	2.2
Commodity contracts	Other assets	—		Other noncurrent liabilities	0.5
Total derivatives designated as hedging instruments		$	0.1		$	2.7

(a) As of September 30, 2015, the Company has commodity hedge agreements with four counterparties.  Three of the counterparties are in payable positions.

(b) The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.

	Asset Derivatives			Liability Derivatives
Derivatives designated as hedging instruments(a) (b)	Balance Sheet Location	December 31, 2014		Balance Sheet Location	December 31, 2014
Commodity contracts	Other current assets	$	0.1	Accrued expenses	$	2.5
Commodity contracts	Other assets	—		Other noncurrent liabilities	1.0
Total derivatives designated as hedging instruments		$	0.1		$	3.5

(a) The Company has commodity hedge agreements with four counterparties.  Amounts recorded as liabilities for the Company’s commodity contracts are payable to all counterparties.  The amount recorded as an asset is due from two counterparties.

(b) The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets approximately $0.1 million of its commodity contracts that are in a receivable position against its contracts in payable positions.

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12. Fair Value Measurements

The Company’s financial instruments are measured and reported at their estimated fair value.  Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction.  When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (level one inputs), or absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (level two inputs). The Company does not have any unobservable inputs that are not corroborated by market inputs (level three inputs).

The Company holds marketable securities associated with its non-qualified retirement plan, which are valued based on readily available quoted market prices.  The Company utilizes derivative instruments to manage its risk of changes in natural gas prices.  The fair value of the natural gas derivative instruments are determined using market data of forward prices for all of the Company’s contracts.  The estimated fair values for each type of instrument are presented below (in millions).

	September 30, 2015			Level One			Level Two			Level Three
Asset Class:
Mutual fund investments in a non-qualified retirement plan(a)	$	1.6		$	1.6		$	—		$	—
Total Assets	$	1.6		$	1.6		$	—		$	—
Liability Class:
Liabilities related to non-qualified retirement plan	$	(1.6	)	$	(1.6	)	$	—		$	—
Derivatives – natural gas instruments	(2.6		)	—			(2.6		)	—
Total Liabilities	$	(4.2	)	$	(1.6	)	$	(2.6	)	$	—

(a) Includes mutual fund investments of approximately 20% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small-cap U.S. companies, approximately 5% in international companies, approximately 5% in bond funds, approximately 35% in short-term investments and approximately 30% in blended funds.

	December 31, 2014			Level One			Level Two			Level Three
Asset Class:
Mutual fund investments in a non-qualified retirement plan(a)	$	1.9		$	1.9		$	—		$	—
Total Assets	$	1.9		$	1.9		$	—		$	—
Liability Class:
Liabilities related to non-qualified retirement plan	$	(1.9	)	$	(1.9	)	$	—		$	—
Derivatives – natural gas instruments	(3.4		)	—			(3.4		)	—
Total Liabilities	$	(5.3	)	$	(1.9	)	$	(3.4	)	$	—

(a) Includes mutual fund investments of approximately 15% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of international companies, approximately 5% in bond funds, approximately 35% in short-term investments and approximately 40% in blended funds.

Cash and cash equivalents, accounts receivable (net of allowance for bad debts) and payables are carried at cost, which approximates fair value due to their liquid and short-term nature. The Company’s investments related to its nonqualified retirement plan of $1.6 million and $1.9 million as of September 30, 2015 and December 31, 2014, respectively, are stated at fair value based on quoted market prices.  As of September 30, 2015, the estimated amount a third-party would pay for the fixed-rate 4.875% senior notes due July 2024, based on available trading information, totaled $231.3 million (level two) compared with the aggregate principal amount at maturity of $250.0 million. The estimated amount a third-party would pay at September 30, 2015 for the amounts outstanding under the credit agreement, based upon available bid information received from the Company’s lender, totaled $369.8 million (level two) compared with the aggregate principal balance of $373.5 million.

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13. Earnings per Share:

The Company calculates earnings per share using the two-class method.  The two-class method requires allocating the Company’s net earnings to both common shares and participating securities.  The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data):

	Three months ended September 30,						Nine months ended September 30,
	2015			2014			2015			2014
Numerator:
Net earnings	$	27.0		$	87.9		$	100.8		$	137.4
Less: net earnings allocated to participating securities (a)	(0.1		)	(0.5		)	(0.6		)	(0.8		)
Net earnings Available to common shareholders	$	26.9		$	87.4		$	100.2		$	136.6
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share	33,696			33,575			33,668			33,542
Weighted-average awards outstanding (b)	12			26			19			24
Shares for diluted earnings per share	33,708			33,601			33,687			33,566
Net earnings per common share, basic	$	0.80		$	2.60		$	2.98		$	4.07
Net earnings per common share, diluted	$	0.80		$	2.60		$	2.97		$	4.07

(a) Participating securities include options, PSUs and RSUs that receive non-forfeitable dividends. Weighted participating securities included 182,000 and 197,000 for the three and nine months ended September 30, 2015, respectively, and 209,000 and 214,000 for the three and nine months ended September 30, 2014, respectively.

(b) For the calculation of diluted earnings per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted average number of outstanding common shares.  In addition, the Company had 450,000 and 429,000 weighted-awards outstanding for the three and nine months ended September 30, 2015, respectively, and 389,000 and 397,000 for the three and nine months ended September 30, 2014, respectively, which were anti-dilutive and therefore not included in the diluted earnings per-share calculation.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

All statements, other than statements of historical fact, contained herein constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995.

Forward-looking statements relate to future events or our future financial performance, and involve known and unknown risks, uncertainties, and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements. Factors that could cause actual results to differ materially from those expressed or implied by the forward-looking statements include, but are not limited to, the following: domestic and international general business and economic conditions; uninsured risks and hazards associated with underground mining operations; losses for acts of nature which may not  be fully reimbursable through our insurance carriers; the timing of any insurance reimbursements may not correspond to the period in which the loss was incurred; governmental policies affecting the agricultural industry, consumer and industrial industry or highway maintenance programs in localities where we or our customers operate; weather conditions; the impact of competitive products; pressure on prices realized by the Company for its products; constraints on supplies and prices of raw materials and energy used in manufacturing certain of our products and the price or availability of transportation services; capacity constraints limiting the production of certain products; the ability to successfully complete acquisitions or integrate acquired businesses; the ability to attract and retain skilled personnel as well as labor relations including without limitation, the impact of work rules, strikes or other disruptions, wage and benefit requirements; difficulties or delays in the development, production, testing and marketing of products; difficulties or delays in receiving or renewing required governmental and regulatory approvals; the impact of new technology on the demand for our products; market acceptance issues, including the failure of products to generate anticipated sales levels; the effects of and changes in trade, monetary, environmental and fiscal policies, laws and regulations; the impact of the Company’s indebtedness and interest rates changes; foreign exchange rates and fluctuations in those rates; the costs and effects of legal and tax proceedings, including environmental and administrative proceedings involving the Company; customer expectations about future potash market prices and availability and agricultural economics; the impact of credit and capital markets, including the risks of customer and counterparty defaults and declining credit availability; changes in tax laws or estimates; cyber security issues; and other risks referenced from time to time in this report and other filings of ours with Securities and Exchange Commission (“SEC”), including the “Risk Factors” of the  Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

In some cases, you can identify forward-looking statements by terminology such as “may,” “might,” “will,” “should,” “could,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” or the negative of these terms or other comparable terminology. These statements are only predictions. Actual events or results may differ materially.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements. We undertake no duty to update any of the forward-looking statements after the date hereof or to reflect the occurrence of unanticipated events.

Unless the context requires otherwise, references in this quarterly report to the “Company,” “Compass,” “Compass Minerals,” “CMP,” “we,” “us” and “our” refer to Compass Minerals International, Inc. (“CMI,” the parent holding company) and its consolidated subsidiaries.

Critical Accounting Estimates

Preparation of our consolidated financial statements in accordance with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. Management believes the most complex and sensitive judgments result primarily from the need to make estimates about matters that are inherently uncertain. Management’s Discussion and Analysis and Note 2 to the Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2014, describe the significant accounting estimates and policies used in preparation of our consolidated financial statements. Actual results in these areas could differ from management’s estimates.

Results of Operations

Salt Segment

Salt is indispensable and enormously versatile with thousands of reported uses. In addition, there are no known cost-effective alternatives for most high-volume uses. As a result, our cash flows from salt have not been materially impacted through a variety of economic cycles. Our high-grade salt deposits, which are among the most extensive in the world; our use of effective mining

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techniques; and our efficient production processes position us among the lowest-cost salt producers in our markets.  Since the highway deicing business accounts for nearly half of our annual sales, our business is seasonal, therefore results and cash flows will vary depending on the severity of the winter weather in our markets.

Deicing products, consisting of deicing salt and magnesium chloride used by highway deicing and consumer and industrial customers, constitute a significant portion of our salt segment sales.  Our deicing sales are seasonal and can fluctuate from year to year depending on the severity of the winter season weather in the markets we serve.  Inventory management practices are employed to respond to the varying level of sales demand which impacts our production volumes, the resulting per-ton cost of inventory and ultimately profit margins, particularly during the second and third quarters when we build our inventory levels for the upcoming winter.  Net earnings are typically lower during the second and third quarters than in the first and fourth quarters.

We assess the severity of winter weather compared to recent averages, using official government snow data and comparisons of our sales volumes to historical trends and other relevant data. Weather affects our highway and consumer and industrial deicing salt sales volumes and resulting gross profit. In our assessment, the winter weather in the markets we serve was near average in the 2014-2015 winter season, as the fourth quarter of 2014 was below average and the first quarter of 2015 was above average.  However, the timing of the sales during the winter season was inconsistent with typical sales patterns creating a favorable impact in the fourth quarter of 2014 with an offsetting negative impact in sales and earnings in the first quarter of 2015.  In our assessment, the effect of winter weather in the markets we serve was above average in the first quarter of 2014.  Due to the severe 2013-2014 winter season, we purchased imported salt in the second half of 2014 and into 2015 in order to serve greater customer demand. These purchases favorably impacted our gross profit but unfavorably impacted our per-unit production costs.  In addition, unplanned downtime at our North American mines in the first quarter of 2015 resulted in additional purchases of imported salt and unfavorably impacted our per-unit production costs. The more severe winter weather in the first quarter of 2014 favorably impacted our sales and our operating earnings and depleted inventories in the market compared to the first quarter of 2015.  The depleted inventories in 2014 strained the supply for deicing products and resulted in higher contract highway deicing prices during the 2014-2015 winter season.  For the upcoming 2015-2016 winter season, we expect lower contract highway deicing prices compared to the prior year as a result of the near average 2014-2015 winter season in the markets we serve.  However, contracted volumes for our highway deicing business are expected to increase for the upcoming winter season due to more highway deicing commitment volumes won in North America compared to the prior year.

Plant Nutrition Segment

Our plant nutrition segment includes sales of specialty plant nutrition products including SOP as well as micronutrient and other products under our Wolf Trax® product line.  SOP, a specialty potassium fertilizer product which is also an ingredient in specialty fertilizer blends, is used as a potassium source for high-value or chloride-sensitive crops and turf.  The yields and/or quality of many high-value or chloride-sensitive crops are generally better when SOP is used as a potassium nutrient rather than potassium chloride (“KCl”).  Our SOP product is marketed under the brand name Protassium+™.  Our Wolf Trax® product line is produced using proprietary and patented technologies.

The fertilizer market is influenced by many factors such as world grain and food supply, changes in consumer diets, general levels of economic activity, governmental food programs, and governmental agriculture and energy policies around the world.  Economic factors may impact the amount or type of crop grown in certain locations or the type or amount of fertilizer product used.  Over the last decade, worldwide consumption of potash and other crop nutrients has increased in response to growing populations and the need for additional food supplies.  We expect the long-term demand for potassium and other plant nutrients to continue to grow as arable land per capita decreases, thereby requiring crop yield efficiencies.

Our domestic sales of Protassium+™ are concentrated in the Western and Southeastern U.S. where the crops and soil conditions favor the use of low-chloride potassium nutrients, such as SOP.  Consequently, weather patterns and field conditions in these locations can impact the amount of plant nutrient sales volumes.  Additionally, the demand for and market price of Protassium+™ may be affected by the broader potash market and the economics of the specialty crops SOP serves. In the third quarter of 2015, our SOP sales have been unfavorably impacted by weakness in the broader agricultural market in certain regions of North America.

Our SOP production facility in Ogden, Utah, the largest in North America and one of only three large-scale SOP solar brine evaporation operations in the world, utilizes naturally occurring brines in its production process.  The brine moves through a series of solar evaporation ponds over a two to three-year production cycle. Since our production process relies on solar evaporation during the summer to produce SOP at our Ogden facility, the intensity of heat and wind speeds and relative dryness of the weather conditions during that time impacts the amount of solar evaporation which occurs and correspondingly, the amount of mineral feedstock available to convert into finished product.  We expect the solar, pond-based effective capacity to be up to 320,000 tons annually for the Ogden facility when weather conditions at our site are typical. We are focusing our sales efforts domestically in

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markets which typically yield higher average selling prices, net of shipping and handling costs, due to their proximity to our facilities.

Our SOP production in Saskatchewan, Canada contributes 40,000 tons to our SOP capacity.  We combine sulfate-rich brine with sourced KCl to create SOP through ion exchange and glaserite processes at this facility.  We purchase the KCl under a long-term supply agreement.  This product is high-purity and in addition to crop nutrient applications is often used in specialty, non-agricultural applications.

In April 2014, we completed the acquisition of Wolf Trax Inc., a privately-held Canadian corporation (renamed Compass Minerals Manitoba Inc. (“Compass Manitoba”)), for approximately $86.5 million at the closing date in cash after customary post-closing adjustments. The acquisition enhanced our position as a key resource for premium plant nutrition products by adding innovative crop nutrient products based upon proprietary and patented technologies.

Beginning in the latter half of 2013, we purchased and consumed KCl feedstock at our Ogden facility to supplement the potassium available for our SOP harvest, and we increased the volume of KCl feedstock in 2014.  These KCl feedstock purchases helped increase production volumes, yet resulted in increased per-unit costs.  In addition, we experienced heavy localized rainfall during the summer of 2014 which limited our deposit of raw materials and will result in a continuation of the purchases of KCl and/or potassium feedstock in 2015 and at higher levels than in 2014. The 2015 SOP solar harvest was also impacted by wet weather at the end of the evaporation season. We have yet to determine the impact on our 2015 harvest. As the spread between market prices for SOP and KCl has increased, the economics of producing SOP partly from KCl has improved for our unique KCl conversion process.  While these KCl purchases will increase our expected full-year product cost and reduce the resulting margin percentages, they are also expected to increase our gross profit. Future purchases of KCl will be based upon several factors, including but not limited to, the cost of utilizing the sourced KCl in our SOP process, our SOP solar harvest and KCl market prices. We currently expect to continue to supplement our pond-based SOP production as long as it is economically feasible to do so.

General

We contract bulk shipping vessels, barge, trucking and rail services to move products from our production facilities to distribution outlets and customers.  Our North American salt mines and SOP production facilities are near either water or rail transport systems, which reduces our shipping and handling costs compared to alternative methods of distribution. However, shipping and handling costs still account for a relatively large portion of the total delivered cost of our products.  Fuel prices declined in the latter half of 2014 and declined further in the first nine months of 2015.  However, portions of the transportation industry have been impacted by supply constraints, particularly the trucking and rail sectors, which have increased costs in 2015 in some of our service regions.  Future period shipping and handling per-unit costs will continue to be influenced by oil-based fuel costs and transportation supply constraints.

Manpower costs; energy costs; packaging; and certain raw material costs, particularly KCl, which can be used to make a portion of our SOP, deicing and water conditioning products, are also significant.  Our production workforce is typically represented by labor unions with multi-year collective bargaining agreements.  Our energy costs result from the consumption of electricity with relatively stable, rate-regulated pricing, and natural gas, which can have significant pricing volatility. We manage the pricing volatility of our natural gas purchases with natural gas forward swap contracts up to 36 months in advance of purchases, helping to reduce the impact of short-term spot market price volatility.

The consolidated financial statements have been prepared to present the historical financial condition, results of operations and cash flows for the Company which include our salt segment, plant nutrition segment, our records management business and unallocated corporate activities.  The results of operations for Compass Manitoba have been included in our plant nutrition segment results from the date of acquisition. The results of operations of the records management business and other incidental revenues include sales of $2.6 million and $2.4 million and $8.6 million and $7.4 million for the three and nine months ended September 30, 2015 and 2014, respectively, and are not material to our consolidated financial statements and consequently, are not included in the table below.  The following tables and discussion should be read in conjunction with the information contained in our consolidated financial statements and the accompanying notes included elsewhere in this quarterly report.

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	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Salt Sales (in millions)
Salt sales	$	179.9	$	175.4	$	612.9	$	647.3
Less: salt shipping and handling	48.5		51.6		178.1		211.7
Salt product sales	$	131.4	$	123.8	$	434.8	$	435.6
Salt Sales Volumes (thousands of tons)
Highway deicing	1,618		1,460		6,476		7,192
Consumer and industrial	600		612		1,573		1,823
Total tons sold	2,218		2,072		8,049		9,015
Average Salt Sales Price (per ton)
Highway deicing	$	55.62	$	57.19	$	59.32	$	53.24
Consumer and industrial	149.82		150.16		145.39		145.04
Combined	81.10		84.65		76.14		71.80
Plant Nutrition Sales (in millions)
Plant nutrition sales	$	50.2	$	62.7	$	187.9	$	194.4
Less: Plant nutrition shipping and handling	4.7		5.9		17.8		21.3
Plant Nutrition product sales	$	45.5	$	56.8	$	170.1	$	173.1
Plant Nutrition Sales Volumes (thousands of tons)	67		86		249		291
Plant Nutrition Average Price (per ton)	$	751	$	736	$	756	$	669

Three Months Ended September 30, 2015 Compared to Three Months Ended September 30, 2014

Sales

Sales for the third quarter of 2015 of $232.7 million decreased $7.8 million, or 3% compared to $240.5 million for the same quarter of 2014. Sales primarily include revenues from our salt and plant nutrition products, or “product sales,” as well as revenues from our records management business, and shipping and handling costs incurred to deliver salt and plant nutrition products to our customers.  Shipping and handling costs decreased $4.3 million from $57.5 million in the third quarter of 2014 to $53.2 million in the third quarter of 2015 due primarily to lower per-unit salt shipping and handling costs and lower plant nutrition sales volumes in the third quarter of 2015 compared to same period of 2014.

Product sales for the third quarter of 2015 of $176.9 million decreased $3.7 million compared to $180.6 million for the same period of 2014, principally reflecting lower plant nutrition segment product sales offset partially by higher salt segment product sales.

Salt product sales for the third quarter of 2015 of $131.4 million increased $7.6 million, or 6% compared to $123.8 million for the same period in 2014.  Salt sales volumes in the quarter increased by 146,000 tons from 2014 levels principally due to higher highway deicing sales volumes, primarily in the U.K., and higher sales volumes to our chemical customers. The increase in salt sales volumes contributed approximately $11 million to the increase in salt product sales.  These increases were offset partially by the impact of exchange rates used to translate our operations denominated in foreign currencies into U.S. dollars in the third quarter of 2015 compared to the exchange rates used in the third quarter of 2014, which unfavorably impacted salt product sales by approximately $5 million. 

Plant nutrition product sales for the third quarter of 2015 of $45.5 million decreased $11.3 million, or 20% compared to $56.8 million for the same period in 2014.  This decrease was due primarily to a decrease in plant nutrition sales volumes of 19,000 tons (22%) in the third quarter of 2015 compared to the prior year due to the impact of the weakness in the broader agricultural market

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in North America. This decrease was partially offset by an increase in our average per-ton market price of approximately 2% during the third quarter of 2015 compared to the same period in 2014. 

Gross Profit

Gross profit for the third quarter of 2015 of $68.0 million decreased $81.8 million, or 55% compared to $149.8 million in the third quarter of 2014 due to decreases in both the salt and plant nutrition segments. As a percent of total sales, the gross margin for the third quarter of 2015 decreased by 33 percentage points from 62% in the third quarter of 2014 to 29% in the third quarter of 2015. The gross profit for the salt segment decreased by approximately $73 million due primarily to the settlement of the insurance claim related to the tornado in Goderich, Ontario. In the third quarter of 2014, we recognized a gain related to the insurance settlement in the salt segment which increased gross profit by $82.3 million (see Note 2). In addition, the gross profit for the salt segment was favorably impacted by higher sales volumes for highway deicing products, lower shipping and handling costs and the favorable impact of product mix on gross profit.  Salt per-unit costs in both periods were unfavorably impacted by sales of imported salt purchased to supplement our production as a result of the more severe 2013-2014 winter season. 

The gross profit for the plant nutrition segment decreased by approximately $10 million in the third quarter of 2015 compared to the same period in the prior year. The decrease in plant nutrition gross profit was primarily due to a decline in plant nutrition sales volumes and an increase in per-unit production costs, as we purchased and consumed KCl and other mineral feedstock to supplement production due to the poor 2014 evaporation season.

Selling, General and Administrative Expenses

Selling, general and administrative expenses for the third quarter of 2015 of $27.2 million increased $0.4 million compared to $26.8 million for the same period of 2014 and increased from 11.1% to 11.7% as a percentage of sales.  The increase in expense is principally due to higher employee compensation expenses and information technology costs in corporate and other, and higher advertising expenses in our plant nutrition segment. These increases were offset partially by lower employee compensation expenses in our salt segment.

Other (Income) Expense, Net

Other income was $4.3 million for the third quarter of 2015 and was $3.1 million for the third quarter of 2014.  Net foreign exchange gains were $4.1 million in the third quarter of 2015 and $2.7 million in the third quarter of 2014.

Income Tax Expense

Income tax expense for the third quarter of 2015 was $12.7 million as compared to $32.7 million for the third quarter of 2014.  Our effective tax rate for the three months ended September 30, 2015 increased from the prior year due to refinements made in the third quarter of 2015 related to the expected full-year effective tax rate. Our income tax provision differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, domestic manufacturing deductions, state income taxes (net of federal tax benefit), foreign income tax rate differentials, foreign mining taxes, and interest expense recognition differences for book and tax purposes.

Nine Months Ended September 30, 2015 Compared to Nine Months Ended September 30, 2014

Sales

Sales for the nine months ended September 30, 2015 of $809.4 million decreased $39.7 million, or 5% compared to $849.1 million for the nine months ended September 30, 2014.  Shipping and handling costs were $195.9 million during the first nine months of 2015, a decrease of $37.1 million compared to $233.0 million for the same period in 2014.  The decrease in shipping and handling costs is primarily due to lower salt and plant nutrition sales volumes and lower per-unit shipping and handling costs in the first nine months of 2015 compared to the same period of 2014.

Product sales for the first nine months of 2015 of $604.9 million decreased $3.8 million from $608.7 million in the same period of 2014, reflecting slightly lower product sales in the plant nutrition and salt segments.

Salt product sales of $434.8 million for the nine months ended September 30, 2015 decreased $0.8 million compared to $435.6 million in the same period of 2014.  The decrease in the first nine months of 2015 was due primarily to lower salt sales volumes, which contributed approximately $51 million to the decrease in salt product sales.  Salt sales volumes in the first nine months of 2015 decreased by 1.0 million tons from 2014 levels due to lower North American highway and consumer deicing sales volumes.

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The winter weather experienced in the first quarter of 2014 was more severe in the markets we serve in North America compared to the winter weather experienced in the first quarter of 2015. In addition, the exchange rates used to translate our operations denominated in foreign currencies into U.S. dollars in the first nine months of 2015 unfavorably impacted salt product sales by approximately $16 million compared to the exchange rates used in the first nine months of 2014.  The decrease in salt product sales was offset partially by an increase in highway salt deicing average selling prices which favorably impacted salt product sales by approximately $65 million due primarily to higher contract sales prices compared to the prior year.

Plant nutrition product sales during the first nine months of 2015 of $170.1 million decreased $3.0 million, or 2% compared to $173.1 million for the same period in 2014.  The decrease in plant nutrition product sales was primarily due to a 14% decrease in sales volumes. This decrease was offset partially by a 13% increase in average selling price realized during the first nine months of 2015 compared to the same period in the prior year.  The average selling price for plant nutrition products benefited from higher market prices for SOP products in the first nine months of 2015 compared to the first nine months of 2014.

Gross Profit

Gross profit for the first nine months of 2015 of $231.8 million decreased $47.8 million, or 17% compared to $279.6 million in the same period of 2014.  As a percent of sales, gross margin decreased by four percentage points, from 33% in the first nine months of 2014 to 29% in the first nine months of 2015.  The gross profit for the salt segment decreased by approximately $48 million due primarily to the settlement of the insurance claim related to a tornado in Goderich, Ontario in 2011. In the third quarter of 2014, we recognized a gain related to the insurance settlement in the salt segment which increased gross profit by $82.3 million (see Note 2). The first nine months of 2015 was also impacted by higher average selling prices for highway deicing products, which was offset partially by lower salt sales volumes. Salt per-unit costs were unfavorably impacted by unplanned downtime at our North American mines in the first quarter of 2015, additional costs of $2 million in the first quarter of 2015 related to a 2010 labor dispute and imported purchased salt used to supplement our 2015 production as a result of the more severe 2013-2014 winter season.  In addition, the effects of exchange rates used to translate our operations denominated in foreign currencies into U.S. dollars in the first nine months of 2015 unfavorably impacted salt gross profit by approximately $3 million compared to the exchange rates used in the first nine months of 2014.

Gross profit for the plant nutrition segment decreased by approximately $3 million in the first nine months of 2015 due principally to lower plant nutrition sales volumes and an increase in per-unit production costs, as we purchased and consumed KCl and other mineral feedstock to supplement production due to the poor 2014 evaporation season, which was offset partially by higher average sales prices realized compared to the same period in the prior year.  Both periods were impacted by higher per-unit production costs as we purchased and consumed KCl and other mineral feedstock to supplement production although costs in the first nine months of 2015 were higher than the same period in 2014.

Selling, General and Administrative Expenses

Selling, general and administrative expenses for the first nine months of 2015 of $82.3 million increased $6.1 million compared to $76.2 million for the same period of 2014 and increased to 10.2% from 9.0% as a percentage of sales.  The increase in expense is partially related to higher costs in our plant nutrition segment due to the increased costs associated with the ongoing operation of Wolf Trax Inc. which was acquired in April 2014.  In addition, selling, general and administrative expenses were higher in corporate and other due to higher information technology and variable compensation costs.

Interest Expense

Interest expense for the first nine months of 2015 of $16.1 million increased $1.7 million compared to $14.4 million for the same period in 2014.  This increase in interest expense is primarily due to the refinancing of our $100.0 million 8% Senior Notes with $250.0 million 4.875% Senior Notes in June 2014.

Other (Income) Expense, Net

Other income was $9.0 million for the first nine months of 2015 and other expense was $0.9 million in the first nine months of 2014.  The second quarter of 2014 includes a $6.9 million charge related to the refinancing of our 8% Senior Notes in June 2014, comprised of call premiums of $4.0 million, the write-off of existing deferred financing fees of $1.4 million and the $1.5 million write-off of the original issue discount on our 8% Senior Notes.  Foreign exchange gains increased from $5.0 million in the first nine months of 2014 to $8.2 million in the first nine months of 2015.

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Income Tax Expense

Income tax expense of $41.6 million for the nine months ended September 30, 2015 decreased $9.1 million from $50.7 million for the same period in 2014 reflecting a decrease in pretax income in 2015.  Our income tax provision differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, domestic manufacturing deductions, state income taxes (net of federal tax benefit), foreign income tax rate differentials, foreign mining taxes, and interest expense recognition differences for book and tax purposes.

Liquidity and Capital Resources

Historically, we have used cash generated from operations to meet our working capital needs, to fund capital expenditures, to pay dividends and to repay our debt. Principally due to the nature of our deicing business, our cash flows from operations are seasonal with the majority of our cash flows from operations generated during the first half of the calendar year.  When we have not been able to meet our short-term liquidity or capital needs with cash from operations, whether as a result of the seasonality of our business or other causes, we have met those needs with borrowings under our $125 million revolving credit facility.  We expect to meet the ongoing requirements for debt service, any declared dividends and capital expenditures from these sources. To a certain extent, this is subject to general economic, financial, competitive, legislative, regulatory, weather and other factors that are beyond our control.

Cash and cash equivalents of $119.1 million as of September 30, 2015 decreased $147.7 million over December 31, 2014.  We generated $95.1 million of operating cash flows in the first nine months of 2015.  We used cash on hand and cash flows from operations to fund capital expenditures of $154.4 million and to pay dividends on our common stock of $67.0 million.

As of September 30, 2015, we had $623.5 million of principal indebtedness consisting of $250.0 million 4.875% Senior Notes due 2024 and $373.5 million of borrowings outstanding under our credit agreement.  No amounts were outstanding under our $125 million revolving credit facility as of September 30, 2015. We had $6.3 million of outstanding letters of credit as of September 30, 2015, which reduced our revolving credit facility borrowing availability to $118.7 million.

Our debt service obligations could, under certain circumstances, materially affect our financial condition and impair our ability to operate our business or pursue our business strategies.  As a holding company, CMI’s investments in its operating subsidiaries constitute substantially all of its assets. Consequently, our subsidiaries conduct all of our consolidated operating activities and own substantially all of our operating assets. The principal source of the cash needed to pay our obligations is the cash generated from our subsidiaries’ operations and their borrowings. Our subsidiaries are not obligated to make funds available to CMI.  Furthermore, we must remain in compliance with the terms of our credit agreement, including the total leverage ratio and interest coverage ratio, in order to make payments on our 4.875% Senior Notes or pay dividends to our stockholders.  We must also comply with the terms of our indenture.  Although we are in compliance with our debt covenants as of September 30, 2015, we can make no assurance that we will remain in compliance with these ratios nor can we make any assurance that the agreements governing the current and future indebtedness of our subsidiaries will permit our subsidiaries to provide us with sufficient dividends, distributions or loans to fund scheduled interest payments on the 4.875% Senior Notes, when due. If we consummate an additional acquisition, our debt service requirements could increase. Furthermore, we may need to refinance all or a portion of our indebtedness on or before maturity; however, we cannot provide assurance that we will be able to refinance any of our indebtedness on commercially reasonable terms or at all.

We have been able to manage our cash flows generated and used across the Company to permanently reinvest earnings in our foreign jurisdictions or efficiently repatriate those funds to the U.S.  As of September 30, 2015, we had $90.3 million of cash and cash equivalents (in the consolidated balance sheets) that was either held directly or indirectly by foreign subsidiaries.  Due in large part to the seasonality of our deicing salt business, we experience large changes in our working capital requirements from quarter to quarter.  Typically, our consolidated working capital requirements are the highest in the fourth quarter and lowest in the second quarter.  When needed, we fund short-term working capital requirements by accessing our $125 million revolving credit facility.  Due to our ability to generate adequate levels of domestic cash flow on an annual basis, it is our current intention to permanently reinvest our foreign earnings outside of the U.S.  However, if we were to repatriate our foreign earnings to the U.S., we may be required to accrue and pay U.S. taxes in accordance with the applicable U.S. tax rules and regulations as a result of the repatriation.  We review our tax circumstances on a regular basis with the intent of optimizing cash accessibility and minimizing tax expense.

In addition, the amount of permanently reinvested earnings is influenced by, among other things, the profits generated by our foreign subsidiaries and the amount of investment in those same subsidiaries.  The profits generated by our domestic and foreign subsidiaries are, to some extent, impacted by the values charged on the transfer of our products between them.  We calculate values charged on transfers based on guidelines established by the multi-national organization which publishes accepted tax guidelines

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recognized in all of the jurisdictions in which we operate, and those calculated values are the basis upon which our subsidiary income taxes, profits and cash flows are realized.  Some of our calculated values have been approved by taxing authorities for certain periods, while the values for those same periods or different periods have been challenged by the same or other taxing authorities.  While we believe our calculations are proper and consistent with the accepted guidelines, we can make no assurance that the final resolution of these matters with all of the relevant taxing authorities will be consistent with our existing calculations and resulting financial statements.  Additionally, the timing for settling these challenges may not occur for many years.  We currently expect the outcome of these matters will not have a material impact on our results of operations.  However, it is possible the resolution could impact the amount of earnings attributable to our domestic and foreign subsidiaries, which could impact the amount of permanently reinvested earnings and the tax-efficient access to consolidated cash on hand in all jurisdictions, as well as future cash flows from operations.

See Note 6 to our Consolidated Financial Statements for a discussion regarding our Canadian tax reassessments.  See Note 8 to our Consolidated Financial Statements for a discussion regarding labor and litigation matters.

For the Nine Months Ended September 30, 2015 and 2014

Net cash flows provided by operating activities for the nine months ended September 30, 2015 were $95.1 million, a decrease of $34.6 million compared to $129.7 million for the first nine months of 2014. We had an increase in working capital items of $73.8 million in the first nine months of 2015 compared to an increase of $17.5 million in the first nine months of 2014. These increases reflect the seasonal nature of our deicing products and will vary largely due to the severity and timing of the winter weather in our regions.

Net cash flows used in investing activities of $155.3 million and $147.5 million for the nine months ended September 30, 2015 and 2014, respectively, resulted from capital expenditures of $154.4 million and $83.5 million, respectively.  Our capital expenditures in 2015 include multi-year projects to refurbish and expand our Ogden, Utah plant and a shaft relining project at our Goderich, Ontario mine.  The remaining capital expenditures were primarily for routine replacements. In April 2014, we acquired Wolf Trax Inc. for $86.5 million on the closing date, and subject to customary post-closing adjustments.  In addition, we received $19.4 million of insurance receipts related to the tornado in Goderich, Ontario, that were presented as investment activities during the first nine months of 2014.

Financing activities during the first nine months of 2015 used $67.5 million of cash flows to make dividend payments of $67.0 million and debt payments of $2.9 million.  During the first nine months of 2014, financing activities were a source of cash flows of $84.3 million, primarily as a result of the refinancing of our $100.0 million 8% Senior Notes with $250.0 million 4.875% Senior Notes.  We also paid dividends of $60.6 million in the first nine months of 2014.  Both periods included proceeds received from stock option exercises.

Sensitivity Analysis Related to EBITDA and Adjusted EBITDA

Management uses a variety of measures to evaluate the performance of CMI.  While the consolidated financial statements, taken as a whole, provide an understanding of our overall results of operations, financial condition and cash flows, we analyze components of the consolidated financial statements to identify certain trends and evaluate specific performance areas.  In addition to using U.S. GAAP financial measures, such as gross profit, net earnings and cash flows generated by operating activities, management uses EBITDA and EBITDA adjusted for items which management believes are not indicative of our ongoing operating performance (“Adjusted EBITDA”).  Both EBITDA and Adjusted EBITDA are non-GAAP financial measures used to evaluate the operating performance of our core business operations. Our resource allocation, financing methods and cost of capital, and income tax positions are managed at a corporate level, apart from the activities of the operating segments, and the operating facilities are located in different taxing jurisdictions, which can cause considerable variation in net earnings.  We also use EBITDA and Adjusted EBITDA to assess our operating performance and return on capital, and to evaluate potential acquisitions or other capital projects.  EBITDA and Adjusted EBITDA are not calculated under U.S. GAAP and should not be considered in isolation or as a substitute for net earnings, cash flows or other financial data prepared in accordance with U.S. GAAP or as a measure of our overall profitability or liquidity.  EBITDA and Adjusted EBITDA exclude interest expense, income taxes and depreciation and amortization, each of which are an essential element of our cost structure and cannot be eliminated.  Furthermore, Adjusted EBITDA excludes other cash and non-cash items in other (income) expense.  Our borrowings are a significant component of our capital structure and interest expense is a continuing cost of debt.  We are also required to pay income taxes, a required and ongoing consequence of our operations.  We have a significant investment in capital assets and depreciation and amortization reflect the utilization of those assets in order to generate revenues.  Consequently, any measure that excludes these elements has material limitations.  While EBITDA and Adjusted EBITDA are frequently used as measures of operating performance, these terms are not necessarily comparable to similarly titled measures of other companies due to the potential inconsistencies in the method of calculation.  The calculation of EBITDA and Adjusted EBITDA as used by management is set forth in the table below (in millions).

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	Three Months Ended September 30,						Nine Months Ended September 30,
	2015			2014			2015			2014
Net earnings	$	27.0		$	87.9		$	100.8		$	137.4
Interest expense	5.4			5.5			16.1			14.4
Income tax expense	12.7			32.7			41.6			50.7
Depreciation, depletion and amortization	19.6			20.0			57.8			57.2
EBITDA	64.7			146.1			216.3			259.7
Adjustments to EBITDA:
Gain from insurance settlement	—			(83.3		)	—			(83.3		)
Other (income) expense, net	(4.3		)	(3.1		)	(9.0		)	0.9
Adjusted EBITDA	$	60.4		$	59.7		$	207.3		$	177.3

Our operating earnings were favorably impacted in the first quarter of 2014 and unfavorably impacted in the first quarter of 2015 by winter weather in the markets we serve. In both periods of 2014, our operating results include a gain of $83.3 million resulting from the settlement of an insurance claim due to a tornado at our salt facilities in Goderich, Ontario in August 2011.

Recent Accounting Pronouncements

See Note 1 to our Consolidated Financial Statements for a discussion of recent accounting pronouncements.

Effects of Currency Fluctuations

We conduct operations in Canada and the U.K. Therefore, our results of operations are subject to both currency transaction risk and currency translation risk. We incur currency transaction risk whenever we or one of our subsidiaries enter into either a purchase or sales transaction using a currency other than the local currency of the transacting entity. With respect to currency translation risk, our financial condition and results of operations are measured and recorded in the relevant local currency and then translated into U.S. dollars for inclusion in our historical consolidated financial statements. Exchange rates between these currencies and the U.S. dollar have fluctuated significantly from time to time and may do so in the future. The majority of our revenues and costs are denominated in U.S. dollars, with British pounds sterling and Canadian dollars also being significant. Significant changes in the value of the Canadian dollar or British pound sterling relative to the U.S. dollar could have a material effect on our financial condition.

Although inflation has not had a significant impact on our operations, our efforts to recover cost increases due to inflation may be hampered as a result of the competitive industries in which we operate.

Seasonality

We experience a substantial amount of seasonality in our sales, primarily with respect to our deicing products.  Consequently, sales and operating income are generally higher in the first and fourth quarters and lower during the second and third quarters of each calendar year. In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the product is used. Following industry practice in North America, we seek to stockpile sufficient quantities of deicing salt in the second, third and fourth quarters to meet the estimated requirements for the winter season.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Our business is subject to various types of market risks that include, but are not limited to, interest rate risk, foreign currency exchange rate risk and commodity pricing risk. Management has taken actions to mitigate our exposure to commodity pricing by entering into forward derivative instruments and may take further actions to mitigate our exposure to interest rates and to changes in the cost of transporting our products due to variations in our contracted carriers’ cost of fuel, which is typically diesel fuel.  However, there can be no assurance that our hedging activities will eliminate or substantially reduce these risks.  We do not enter into any financial instrument arrangements for speculative purposes. Our market risk exposure related to these items has not changed materially since December 31, 2014.

28

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures – As of the end of the period covered by this report, an evaluation of the effectiveness of the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) was performed under the supervision and with the participation of the Company’s management, including the CEO and CFO. Based on that evaluation, the Company’s CEO and CFO concluded that the Company’s disclosure controls and procedures were effective as of September 30, 2015 to ensure that information required to be disclosed in the reports it files and submits under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms.

For this purpose, disclosure controls and procedures include controls and procedures designed to ensure that information that is required to be disclosed under the Exchange Act is accumulated and communicated to the Company's management, including the CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting - There has been no change in the Company’s internal control over financial reporting during the most recently completed fiscal quarter that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II.  OTHER INFORMATION

Item 1. Legal Proceedings

From time to time, we are involved in various routine legal proceedings. These primarily involve commercial claims, product liability claims, personal injury claims and workers’ compensation claims. We cannot predict the outcome of these lawsuits, legal proceedings and claims with certainty. Nevertheless, we believe that the outcome of these proceedings, even if determined adversely, would not have a material adverse effect on our business, financial condition and results of operations. There have been no material developments during 2015 with respect to legal proceedings.

Item 1A. Risk Factors

For a discussion of the risk factors applicable to the Company, please refer to Part I, Item 1A. “Risk Factors” in the Company’s Form 10-K for the year ended December 31, 2014.  There have been no material changes to the Company’s risk factors as disclosed in such Form 10-K.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95 to this quarterly report.

Item 5. Other Information

None.

Item 6. Exhibits

The Exhibit Index attached to this Quarterly Report on Form 10-Q is hereby incorporated by reference.

29

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.

	COMPASS MINERALS INTERNATIONAL, INC.
Date: October 28, 2015	/s/ FRANCIS J. MALECHA
	Francis J. Malecha
	President and Chief Executive Officer
	(Principal Executive Officer)
Date: October 28, 2015	/s/ MATTHEW J. FOULSTON
	Matthew J. Foulston
	Chief Financial Officer
	(Principal Financial and Accounting Officer)

30

EXHIBIT INDEX

Exhibit No.	Description of Exhibit
31.1*	Section 302 Certifications of Francis J. Malecha, President and Chief Executive Officer
31.2*	Section 302 Certifications of Matthew J. Foulston, Chief Financial Officer
32**	Certification Pursuant to 18 U.S.C. §1350 of Francis J. Malecha, President and Chief Executive Officer and Matthew J. Foulston, Chief Financial Officer
95*	Mine Safety Disclosures
101**	The following financial statements from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2015, formatted in Extensive Business Reporting Language (XBRL): (i) consolidated balance sheets, (ii) consolidated statements of operations, (iii) consolidated statements of comprehensive income (loss), (iv) consolidated statement of stockholders’ equity, (v) consolidated statements of cash flows, and (vi) the notes to the consolidated financial statements

* Filed herewith

** Furnished herewith

31

EX-31.1

Exhibit 31.1

I, Francis J. Malecha, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Compass Minerals International, Inc.;

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 the 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 28, 2015	/s/ FRANCIS J. MALECHA
	Francis J. Malecha
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

I, Matthew J. Foulston, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Compass Minerals International, Inc.;

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 the 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 28, 2015	/s/ MATTHEW J. FOULSTON
	Matthew J. Foulston
	Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO 18 U.S.C. §1350

Each of the undersigned hereby certify that this quarterly report on Form 10-Q for the quarterly period ended September 30, 2015, as filed with the Securities and Exchange Commission on the date hereof, to the best of my knowledge, fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Compass Minerals International, Inc.

	COMPASS MINERALS INTERNATIONAL, INC.
October 28, 2015	/s/ FRANCIS J. MALECHA
	Francis J. Malecha
	President and Chief Executive Officer
	/s/ MATTHEW J. FOULSTON
	Matthew J. Foulston
	Chief Financial Officer

EX-95

Exhibit 95

Dodd-Frank Act Disclosure of Mine Safety and Health Administration Safety Data

Section 1503 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Act”) requires mining companies to disclose in their periodic reports information about their mines subject to regulation by the Mine Safety and Health Administration (“MSHA”) under the Federal Mine Safety and Health Act of 1977 (the “Mine Act”). The operation of our mine in Cote Blanche, Louisiana is inspected by MSHA on an ongoing basis and MSHA issues citations and/or orders when it believes a violation under the Mine Act has occurred. The following table provides the information required under §1503 of the Act for the quarterly period ended September 30, 2015:

For the Three Months Ended September 30, 2015

Mine or Operating Name (MSHA Identification Number)

Section 104 S&S Citations(1)

Section 104(b) Orders(2)

Section 104(d) Citations and Orders(3)

Section 110(b)(2) Violations(4)

Section 107(a) Orders(5)

Total Dollar Value of MSHA Assessments Proposed

Total Number of Mining Related Fatalities

Received Notice of Pattern of Violations Under Section 104(e)(6)

Received Notice of Potential to Have Pattern Under Section 104(e)

Legal Actions Pending as of Last Day of Period

Legal Actions Initiated During Period

Legal Actions Resolved During Period

Cote Blanche, LA (16-00358)

3

—

—

—

—

$

2,742

—

No

No

2(7)

1(8)

1(9)

⁽¹⁾ Section 104(a) S&S citations are alleged violations of mandatory health or safety standards that could significantly and substantially contribute to a mine health and safety hazard.

⁽²⁾ Section 104(b) orders are alleged failures to abate or correct an alleged violation within the period of time specified in the citation or order.

⁽³⁾ Section 104(d) citations and orders are issued for alleged unwarrantable failures-aggravated conduct constituting more than ordinary negligence-to comply with mandatory safety or health standards. 

⁽⁴⁾ Section 110(b)(2) violations are issued for alleged “flagrant” failures-reckless or repeated failures-to make reasonable efforts to eliminate a known violation of a mandatory safety or health standard that substantially proximately caused, or reasonably could have been expected to cause, death or serious bodily injury.

⁽⁵⁾ Section 107(a) imminent danger orders are issued for alleged conditions or practices which could reasonably be expected to cause death or serious physical harm before such condition or practice can be abated. A 107(a) order requires an operator to immediately withdraw miners from the area of the mine affected by the condition.

⁽⁶⁾ Section 104(e) written notices are served when MSHA determines that a mine operator has demonstrated a pattern of violating mandatory health or safety standards that could significantly and substantially contribute to a mine safety or health hazard.

⁽⁷⁾ The legal actions pending as of the last day of the reporting period are: (a) the civil penalty proceeding involving the contest of Citation No. 8624082 and the related civil penalty; and (b) the civil penalty proceeding involving contest of Citation No. 8776619 and the related civil penalty. MSHA has not filed a Petition for Assessment for either matter with the Federal Mine Safety and Health Review Commission (“Commission”).  When that occurs, the Commission will assign a docket numbers to the civil penalty proceedings. All of these matters concern contests of citations or orders issued under section 104 of the Mine Act, along with the contests of the proposed penalties for each of these.

⁽⁸⁾ MSHA issued Citation No. 8624082 to Compass on June 11, 2015. It alleges a Section 104(a) non-S&S violation. Compass contested Citation No. 8624082 and the $138 penalty MSHA proposed for the alleged violation during the reporting period.

⁽⁹⁾ Commission Docket No. 2015-0015, a civil penalty proceeding involving Citation Nos. 8772042 and 8772043, was resolved during the reporting period.

XML

Operating Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gain from insurance settlement			$ 0.0	$ 83.3
Segment Reporting Information [Abstract]
Sales	$ 232.7	$ 240.5	809.4	849.1
Shipping and handling cost	53.2	57.5	195.9	233.0
Operating earnings (loss)	40.8	123.0	149.5	203.4
Depreciation, depletion and amortization	19.6	20.0	57.8	57.2
Total assets (as of end of period)	1,528.7	1,546.5	1,528.7	1,546.5	$ 1,637.2
Operating Segments [Member] | Salt [Member]
Segment Reporting Information [Line Items]
Gain from insurance settlement		82.3		82.3
Segment Reporting Information [Abstract]
Sales	179.9	175.4	612.9	647.3
Shipping and handling cost	48.5	51.6	178.1	211.7
Operating earnings (loss)	45.0	116.7	143.1	187.0
Depreciation, depletion and amortization	11.1	11.4	32.9	33.5
Total assets (as of end of period)	898.2	970.1	898.2	970.1
Operating Segments [Member] | Plant Nutrition [Member]
Segment Reporting Information [Abstract]
Sales	50.2	62.7	187.9	194.4
Shipping and handling cost	4.7	5.9	17.8	21.3
Operating earnings (loss)	8.8	19.0	46.4	53.2
Depreciation, depletion and amortization	7.6	7.1	21.7	20.0
Total assets (as of end of period)	568.9	517.7	568.9	517.7
Intersegment Sales [Member]
Segment Reporting Information [Abstract]
Sales	(1.6)	(1.8)	(5.2)	(5.4)
Intersegment Sales [Member] | Salt [Member]
Segment Reporting Information [Abstract]
Sales	0.0	0.3	0.1	0.7
Intersegment Sales [Member] | Plant Nutrition [Member]
Segment Reporting Information [Abstract]
Sales	1.6	1.5	5.1	4.7
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Gain from insurance settlement		1.0		1.0
Segment Reporting Information [Abstract]
Sales	2.6	2.4	8.6	7.4
Shipping and handling cost	0.0	0.0	0.0	0.0
Operating earnings (loss)	(13.0)	(12.7)	(40.0)	(36.8)
Depreciation, depletion and amortization	0.9	1.5	3.2	3.7
Total assets (as of end of period)	$ 61.6	$ 58.7	$ 61.6	$ 58.7

XML

Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Liability Class:
Mutual fund investments percentage of fund invested in common stock of large-cap U.S. (in hundredths)	20.00%	15.00%
Mutual fund investments percentage of fund invested in common stock small-cap U.S. (in hundredths)	5.00%
Mutual fund investments percentage of fund invested in common stock of international companies (in hundredths)	5.00%	5.00%
Mutual fund investments percentage of fund invested in bond funds (in hundredths)	5.00%	5.00%
Mutual fund investments percentage of fund invested in short-term investments (in hundredths)	35.00%	35.00%
Mutual fund investments percentage of fund invested in blended funds (in hundredths)	30.00%	40.00%
Fair Value, Measurements, Recurring [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	$ 1.6	$ 1.9
Total Assets	1.6	1.9
Liability Class:
Liabilities related to non-qualified retirement plan	(1.6)	(1.9)
Derivatives – natural gas instruments	(2.6)	(3.4)
Total Liabilities	(4.2)	(5.3)
Fair Value, Measurements, Recurring [Member] | Level One [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	1.6	1.9
Total Assets	1.6	1.9
Liability Class:
Liabilities related to non-qualified retirement plan	(1.6)	(1.9)
Derivatives – natural gas instruments	0.0	0.0
Total Liabilities	(1.6)	(1.9)
Fair Value, Measurements, Recurring [Member] | Level Two [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	0.0	0.0
Total Assets	0.0	0.0
Liability Class:
Liabilities related to non-qualified retirement plan	0.0	0.0
Derivatives – natural gas instruments	(2.6)	(3.4)
Total Liabilities	(2.6)	(3.4)
Fair Value, Measurements, Recurring [Member] | Level Three [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	0.0	0.0
Total Assets	0.0	0.0
Liability Class:
Liabilities related to non-qualified retirement plan	0.0	0.0
Derivatives – natural gas instruments	0.0	0.0
Total Liabilities	$ 0.0	$ 0.0
4.875% Senior Notes [Member]
Fair Value of Outstanding Debt [Line Items]
Senior notes, interest rate	4.875%
Fair value of senior notes	$ 231.3
Aggregate principal amount due at maturity	250.0
Term loan [Member]
Fair Value of Outstanding Debt [Line Items]
Aggregate principal amount due at maturity	373.5
Fair value of credit agreement debt	$ 369.8

XML

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Finished goods	$ 218.1	$ 148.5
Raw materials and supplies	50.6	50.5
Total inventories	$ 268.7	$ 199.0

XML

Goodwill and Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Estimated lives of intangible assets

The estimated lives of the Company’s intangible assets are as follows:

Intangible asset	Estimated Lives
Supply agreement	50 years
SOP production rights	25 years
Patents	10-20 years
Developed technology	5 years
Lease rights	25 years
Customer and distributor relationships	10 years
Trademarks	10 years
Noncompete agreements	5 years
Trade names	Indefinite
Water rights	Indefinite

XML

Stockholders' Equity and Equity Instruments - Activity (Details) - $ / shares	3 Months Ended	9 Months Ended
	Mar. 31, 2015	Sep. 30, 2015
Weighted-average fair value
Reissued shares of treasury stock (in shares)		31,141
TSR PSUs [Member]
Weighted-average fair value
Weighted-average fair value, Granted (in dollars per share)		$ 111.07
Stock Options [Member]
Number
Outstanding at beginning of period (in shares)	278,429	278,429
Granted (in shares)		120,956
Exercised (in shares)		(31,104)
Cancelled/Expired (in shares)		(9,060)
Outstanding at end of period (in shares)		359,221
Weighted-average exercise price
Weighted-average exercise price at beginning of period (in dollars per share)	$ 79.23	$ 79.23
Weighted-average exercise price, Granted (in dollars per share)		91.76
Weighted-average exercise price, Exercised (in dollars per share)		72.20
Weighted-average exercise price, Cancelled/Expired (in dollars per share)		84.81
Weighted-average exercise price at end of period (in dollars per share)		$ 83.88
Weighted-average fair value
Reissued shares of treasury stock (in shares)		31,104
RSUs [Member]
Number
Outstanding at beginning of period (in shares)	88,532	88,532
Granted (in shares)		19,492
Released from restriction (in shares)		(15,952)
Cancelled/Expired (in shares)		(2,188)
Outstanding at end of period (in shares)		89,884
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share)	$ 76.58	$ 76.58
Weighted-average fair value, Granted (in dollars per share)		91.76
Weighted-average fair value, Released from restriction (in dollars per share)		71.69
Weighted-average fair value, Cancelled/Expired (in dollars per share)		81.56
Weighted-average fair value at end of period (in dollars per share)		$ 80.62
Reissued shares of treasury stock (in shares)		15,952
PSUs [Member]
Number
Outstanding at beginning of period (in shares)	59,627	59,627
Granted (in shares)		35,584
Released from restriction (in shares)		(10,454)
Cancelled/Expired (in shares)		(6,689)
Outstanding at end of period (in shares)		78,068
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share)	$ 88.69	$ 88.69
Weighted-average fair value, Granted (in dollars per share)		100.49
Weighted-average fair value, Released from restriction (in dollars per share)		74.49
Weighted-average fair value, Cancelled/Expired (in dollars per share)		81.47
Weighted-average fair value at end of period (in dollars per share)		$ 96.59
Attainment level of PSU at grant date		100.00%
PSU at grant date (in shares per unit)		1
PSUs [Member] | Grant Date 2012 [Member]
Number
Cancelled/Expired (in shares)	(4,443)
Weighted-average fair value
Reissued shares of treasury stock (in shares)	10,454	10,454

XML

Long-term Debt (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt, total	$ 623.5	$ 626.4
Less current portion	(3.9)	(3.9)
Long-term debt	619.6	622.5
Revolving Credit Facility [Member] | Revolving Credit Facility due August 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 0.0	$ 0.0
Long term debt maturity date	Aug. 31, 2017	Aug. 31, 2017
Secured Debt [Member] | Term Loan due May 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 373.5	$ 376.4
Long term debt maturity date	May 31, 2017	May 31, 2017
Senior Notes [Member] | 4.875% Senior Notes due July 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, total	$ 250.0	$ 250.0
Long term debt maturity date	Jul. 31, 2024	Jul. 31, 2024
Senior notes, interest rate	4.875%	4.875%

XML

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net earnings	$ 27.0	$ 87.9	$ 100.8	$ 137.4
Less: net earnings allocated to participating securities	(0.1)	(0.5)	(0.6)	(0.8)
Net earnings Available to common shareholders	$ 26.9	$ 87.4	$ 100.2	$ 136.6
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share (in shares)	33,696	33,575	33,668	33,542
Weighted-average awards outstanding (in shares)	12	26	19	24
Shares for diluted earnings per share (in shares)	33,708	33,601	33,687	33,566
Net earnings per common share, basic (in dollars per share)	$ 0.80	$ 2.60	$ 2.98	$ 4.07
Net earnings per common share, diluted (in dollars per share)	$ 0.80	$ 2.60	$ 2.97	$ 4.07
Participating securities (in shares)	182	209	197	214
Weighted anti-dilutive awards outstanding (in shares)	450	389	429	397

XML

Accounting Policies and Basis of Presentation

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Accounting Policies and Basis of Presentation

Accounting Policies and Basis of Presentation:

Compass Minerals International, Inc., through its subsidiaries, is a producer and marketer of essential mineral products with manufacturing sites in North America and the United Kingdom (“U.K.”). References to the “Company,” “Compass,” “Compass Minerals,” “CMP,” “we,” “us” and “our” refer to Compass Minerals International, Inc. (“CMI”, the parent holding company) and its consolidated subsidiaries. The Company’s principal products are salt, consisting of sodium chloride and magnesium chloride, and sulfate of potash (“SOP”), a specialty fertilizer the Company markets under the trade name Protassium+™.  Additionally, the Company sells various premium micronutrient products under its Wolf Trax® brand.  The Company provides highway deicing products to customers in North America and the U.K., and plant nutrients to growers and fertilizer distributors worldwide.  The Company also produces and markets consumer deicing and water conditioning products, ingredients used in consumer and commercial food preparation, and other mineral-based products for consumer, agricultural and industrial applications.  Compass Minerals also provides records management services to businesses located in the U.K.

CMP is a holding company with no operations other than those of its wholly-owned subsidiaries.  The consolidated financial statements include the accounts of CMP and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.

The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of CMP for the year ended December 31, 2014 as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring accruals considered necessary for a fair presentation, have been included.

The Company experiences a substantial amount of seasonality in salt segment sales, primarily with respect to its deicing products. As a result, sales and operating income are generally higher in the first and fourth quarters and lower during the second and third quarters of each year.  In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the product is used. Following industry practice in North America and the U.K., the Company seeks to stockpile sufficient quantities of deicing salt throughout the second, third and fourth quarters to meet the estimated requirements for the upcoming winter season. Production of deicing salt can vary based on the severity or mildness of the preceding winter season.  Due to the seasonal nature of the deicing product lines, operating results for the interim periods are not necessarily indicative of the results that may be expected for the full year.

Recent Accounting Pronouncements – In July 2015, the Financial Accounting Standards Board ("FASB") issued guidance that requires entities to measure inventory within the scope of the standard at the lower of cost or net realizable value. "Net realizable value" is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early adoption is permitted. The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In April 2015, the FASB issued guidance about whether fees paid by customers in cloud computing arrangements include a software license.  If a cloud computing arrangement includes a software license, a customer should account for the software license element in a manner consistent with previously issued guidance for software licenses.  If the arrangement does not include a software license, a customer should account for the arrangement as a service contract.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015.  An entity can adopt the guidance prospectively or retrospectively and early adoption is permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In April 2015, the FASB issued guidance which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the related debt liability rather than an asset.  The recognition and measurement guidance for debt issuance costs are not affected by this guidance.  This new guidance is effective retrospectively for fiscal years, and interim periods within those years, beginning after December 15, 2015.  Early adoption is permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In August 2014, the FASB issued guidance which requires management to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide disclosure in the footnotes under certain circumstances.  This guidance is effective for fiscal years ending after December 15, 2016 with early adoption permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers.  The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services.  This guidance is effective for fiscal years and interim periods with those years beginning after December 15, 2017 and early adoption is not permitted.  The guidance permits the use of either a full or modified retrospective or cumulative effect transition method.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.

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Stockholders' Equity and Equity Instruments - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (53.0)	$ 38.6	$ (15.5)	$ 34.5
Other comprehensive income (loss) before reclassifications	(37.7)	(28.9)	(76.9)	(24.8)
Amounts reclassified from accumulated other comprehensive income (loss)	0.5	0.3	2.2	0.3
Net current period other comprehensive income (loss)	(37.2)	(28.6)	(74.7)	(24.5)
Ending balance	(90.2)	10.0	(90.2)	10.0
Losses (gains) on foreign exchange of intercompany notes of long-term nature	13.0	10.4	27.6	10.8
Gains and (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1.5)	0.4	(2.0)	0.3
Other comprehensive income (loss) before reclassifications	(0.3)	(0.5)	(0.9)	0.2
Amounts reclassified from accumulated other comprehensive income (loss)	0.3	0.0	1.4	(0.6)
Net current period other comprehensive income (loss)	0.0	(0.5)	0.5	(0.4)
Ending balance	(1.5)	(0.1)	(1.5)	(0.1)
Defined Benefit Pension [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(8.4)	(8.7)	(9.0)	(9.3)
Other comprehensive income (loss) before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.3	0.8	0.9
Net current period other comprehensive income (loss)	0.2	0.3	0.8	0.9
Ending balance	(8.2)	(8.4)	(8.2)	(8.4)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(43.1)	46.9	(4.5)	43.5
Other comprehensive income (loss) before reclassifications	(37.4)	(28.4)	(76.0)	(25.0)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Net current period other comprehensive income (loss)	(37.4)	(28.4)	(76.0)	(25.0)
Ending balance	$ (80.5)	$ 18.5	$ (80.5)	$ 18.5

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of hedged items

The following tables present the fair value of the Company’s hedged items as of September 30, 2015 and December 31, 2014, (in millions):

	Asset Derivatives			Liability Derivatives
Derivatives designated as hedging instruments(a) (b)	Balance Sheet Location	September 30, 2015		Balance Sheet Location	September 30, 2015
Commodity contracts	Other current assets	$	0.1	Accrued expenses	$	2.2
Commodity contracts	Other assets	—		Other noncurrent liabilities	0.5
Total derivatives designated as hedging instruments		$	0.1		$	2.7

(a) As of September 30, 2015, the Company has commodity hedge agreements with four counterparties.  Three of the counterparties are in payable positions.

(b) The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.

	Asset Derivatives			Liability Derivatives
Derivatives designated as hedging instruments(a) (b)	Balance Sheet Location	December 31, 2014		Balance Sheet Location	December 31, 2014
Commodity contracts	Other current assets	$	0.1	Accrued expenses	$	2.5
Commodity contracts	Other assets	—		Other noncurrent liabilities	1.0
Total derivatives designated as hedging instruments		$	0.1		$	3.5

(a) The Company has commodity hedge agreements with four counterparties.  Amounts recorded as liabilities for the Company’s commodity contracts are payable to all counterparties.  The amount recorded as an asset is due from two counterparties.

(b) The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets approximately $0.1 million of its commodity contracts that are in a receivable position against its contracts in payable positions.

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Stockholders' Equity and Equity Instruments (Tables)

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Range of estimates and calculated fair values of options granted in period

The range of estimates and calculated fair values for options granted during the first nine months of 2015 is included in the table below. The weighted-average grant date fair value of these options was $14.78.

	Range
Fair value of options granted	$ 14.22 - $15.09
Exercise price	$ 91.75 - $93.26
Expected term (years)	4.5-5
Expected volatility	24.7% - 25.0%
Dividend yield	3.1%
Risk-free rate of return	1.3% - 1.6 %

Stock-based compensation activity

The following table summarizes stock-based compensation activity during the nine months ended September 30, 2015.

	Stock Options				RSUs				PSUs(a)
	Number		Weighted-average exercise price		Number		Weighted-average fair value		Number		Weighted-average fair value
Outstanding at December 31, 2014	278,429		$	79.23	88,532		$	76.58	59,627		$	88.69
Granted	120,956		91.76		19,492		91.76		35,584		100.49
Exercised (b)	(31,104	)	72.20		—		—		—		—
Released from restriction (b)	—		—		(15,952	)	71.69		(10,454	)	74.49
Cancelled/Expired	(9,060	)	84.81		(2,188	)	81.56		(6,689	)	81.47
Outstanding at September 30, 2015	359,221		$	83.88	89,884		$	80.62	78,068		$	96.59

(a) Until they vest, PSUs are included in the table at the 100% attainment level at their grant date and at that level represent one share per unit.  The final performance period for the 2012 PSU grant was completed in 2014.  The Company issued 10,454 shares and cancelled 4,443 PSUs due to performance in the first quarter of 2015 related to the 2012 PSU grant.

(b) Common stock issued for exercised options and RSUs and PSUs released from restriction was issued from treasury stock.

Components of and changes in accumulated other comprehensive income

The components of and changes in accumulated other comprehensive income (loss) (“AOCI”) as of and for the three and nine months ended September 30, 2015 and 2014 are as follows (in millions):

Three Months Ended September 30, 2015 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	(1.5	)	$	(8.4	)	$	(43.1	)	$	(53.0	)
Other comprehensive income (loss) before reclassifications (b)	(0.3		)	—			(37.4		)	(37.7		)
Amounts reclassified from accumulated other comprehensive income (loss)	0.3			0.2			—			0.5
Net current period other comprehensive income (loss)	—			0.2			(37.4		)	(37.2		)
Ending balance	$	(1.5	)	$	(8.2	)	$	(80.5	)	$	(90.2	)

Three Months Ended September 30, 2014 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	0.4		$	(8.7	)	$	46.9		$	38.6
Other comprehensive income (loss) before reclassifications (b)	(0.5		)	—			(28.4		)	(28.9		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			0.3			—			0.3
Net current period other comprehensive income (loss)	(0.5		)	0.3			(28.4		)	(28.6		)
Ending balance	$	(0.1	)	$	(8.4	)	$	18.5		$	10.0

Nine Months Ended September 30, 2015 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	(2.0	)	$	(9.0	)	$	(4.5	)	$	(15.5	)
Other comprehensive income (loss) before reclassifications (b)	(0.9		)	—			(76.0		)	(76.9		)
Amounts reclassified from accumulated other comprehensive income (loss)	1.4			0.8			—			2.2
Net current period other comprehensive income (loss)	0.5			0.8			(76.0		)	(74.7		)
Ending balance	$	(1.5	)	$	(8.2	)	$	(80.5	)	$	(90.2	)

Nine Months Ended September 30, 2014 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	0.3		$	(9.3	)	$	43.5		$	34.5
Other comprehensive income (loss) before reclassifications (b)	0.2			—			(25.0		)	(24.8		)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.6		)	0.9			—			0.3
Net current period other comprehensive income (loss)	(0.4		)	0.9			(25.0		)	(24.5		)
Ending balance	$	(0.1	)	$	(8.4	)	$	18.5		$	10.0

(a) With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.

(b) The Company recorded foreign exchange (gains) losses of approximately $13.0 million and $27.6 million in the three months and nine months ended September 30, 2015, respectively, and $10.4 million and $10.8 million in the three and nine months ended September 30, 2014, respectively, in accumulated other comprehensive income (loss) related to intercompany notes which were deemed to be of long-term investment nature.

Reclassifications out of Accumulated Other Comprehensive Income

The amounts reclassified from AOCI to (income) expense for the three and nine months ended September 30, 2015 and 2014 are shown below (in millions):

	Amount Reclassified from AOCI
	Three Months Ended September 30, 2015			Nine Months Ended September 30, 2015			Line Item Impacted in the Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments	$	0.5		$	2.2		Product cost
	(0.2		)	(0.8		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.3			1.4
Amortization of defined benefit pension:
Amortization of loss	$	0.3		$	1.0		Product cost
	(0.1		)	(0.2		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.2			0.8
Total reclassifications, net of income taxes	$	0.5		$	2.2

	Amount Reclassified from AOCI
	Three Months Ended September 30, 2014			Nine Months Ended September 30, 2014			Line Item Impacted in the Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments	$	(0.1	)	$	(1.0	)	Product cost
	0.1			0.4			Income tax expense (benefit)
Reclassifications, net of income taxes	—			(0.6		)
Amortization of defined benefit pension:
Amortization of loss	$	0.4		$	1.2		Product cost
	(0.1		)	(0.3		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.3			0.9
Total reclassifications, net of income taxes	$	0.3		$	0.3

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Stockholders' Equity and Equity Instruments - Amount Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	$ 111.5	$ 33.2	$ 381.7	$ 336.5
Income tax expense (benefit)	12.7	32.7	41.6	50.7
Total reclassifications, net of income taxes	27.0	87.9	100.8	137.4
Reclassifications, net of income taxes [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of income taxes	0.5	0.3	2.2	0.3
Reclassifications, net of income taxes [Member] | Gains and (losses) from cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.5	(0.1)	2.2	(1.0)
Income tax expense (benefit)	(0.2)	0.1	(0.8)	0.4
Total reclassifications, net of income taxes	0.3	0.0	1.4	(0.6)
Reclassifications, net of income taxes [Member] | Amortization of defined benefit pension [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.3	0.4	1.0	1.2
Income tax expense (benefit)	(0.1)	(0.1)	(0.2)	(0.3)
Total reclassifications, net of income taxes	$ 0.2	$ 0.3	$ 0.8	$ 0.9

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair value measurements

The estimated fair values for each type of instrument are presented below (in millions).

	September 30, 2015			Level One			Level Two			Level Three
Asset Class:
Mutual fund investments in a non-qualified retirement plan(a)	$	1.6		$	1.6		$	—		$	—
Total Assets	$	1.6		$	1.6		$	—		$	—
Liability Class:
Liabilities related to non-qualified retirement plan	$	(1.6	)	$	(1.6	)	$	—		$	—
Derivatives – natural gas instruments	(2.6		)	—			(2.6		)	—
Total Liabilities	$	(4.2	)	$	(1.6	)	$	(2.6	)	$	—

(a) Includes mutual fund investments of approximately 20% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small-cap U.S. companies, approximately 5% in international companies, approximately 5% in bond funds, approximately 35% in short-term investments and approximately 30% in blended funds.

	December 31, 2014			Level One			Level Two			Level Three
Asset Class:
Mutual fund investments in a non-qualified retirement plan(a)	$	1.9		$	1.9		$	—		$	—
Total Assets	$	1.9		$	1.9		$	—		$	—
Liability Class:
Liabilities related to non-qualified retirement plan	$	(1.9	)	$	(1.9	)	$	—		$	—
Derivatives – natural gas instruments	(3.4		)	—			(3.4		)	—
Total Liabilities	$	(5.3	)	$	(1.9	)	$	(3.4	)	$	—

(a) Includes mutual fund investments of approximately 15% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of international companies, approximately 5% in bond funds, approximately 35% in short-term investments and approximately 40% in blended funds.

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Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data):

	Three months ended September 30,						Nine months ended September 30,
	2015			2014			2015			2014
Numerator:
Net earnings	$	27.0		$	87.9		$	100.8		$	137.4
Less: net earnings allocated to participating securities (a)	(0.1		)	(0.5		)	(0.6		)	(0.8		)
Net earnings Available to common shareholders	$	26.9		$	87.4		$	100.2		$	136.6
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share	33,696			33,575			33,668			33,542
Weighted-average awards outstanding (b)	12			26			19			24
Shares for diluted earnings per share	33,708			33,601			33,687			33,566
Net earnings per common share, basic	$	0.80		$	2.60		$	2.98		$	4.07
Net earnings per common share, diluted	$	0.80		$	2.60		$	2.97		$	4.07

(a) Participating securities include options, PSUs and RSUs that receive non-forfeitable dividends. Weighted participating securities included 182,000 and 197,000 for the three and nine months ended September 30, 2015, respectively, and 209,000 and 214,000 for the three and nine months ended September 30, 2014, respectively.

(b) For the calculation of diluted earnings per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted average number of outstanding common shares.  In addition, the Company had 450,000 and 429,000 weighted-awards outstanding for the three and nine months ended September 30, 2015, respectively, and 389,000 and 397,000 for the three and nine months ended September 30, 2014, respectively, which were anti-dilutive and therefore not included in the diluted earnings per-share calculation.

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net earnings	$ 100.8	$ 137.4
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation, depletion and amortization	57.8	57.2
Finance fee amortization	0.9	0.9
Early extinguishment of debt	0.0	6.9
Stock-based compensation	4.9	3.7
Deferred income taxes	1.2	13.0
Gain from insurance settlement	0.0	(83.3)
Other, net	2.6	(0.3)
Insurance receipts for operating purposes, Goderich tornado	0.0	11.9
Changes in operating assets and liabilities, net of acquisition:
Receivables	70.1	64.0
Inventories	(78.2)	(38.1)
Other assets	(11.7)	(11.3)
Accounts payable and accrued expenses	(54.0)	(32.1)
Other liabilities	0.7	(0.2)
Net cash provided by operating activities	95.1	129.7
Cash flows from investing activities:
Capital expenditures	(154.4)	(83.5)
Acquisition of business	0.0	(86.5)
Insurance receipts for investment purposes, Goderich tornado	0.0	19.4
Other, net	(0.9)	3.1
Net cash used in investing activities	(155.3)	(147.5)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0.0	250.0
Principal payments on long-term debt	(2.9)	(101.4)
Premium and other payments to refinance debt	0.0	(5.5)
Deferred financing costs	0.0	(4.1)
Dividends paid	(67.0)	(60.6)
Proceeds received from stock option exercises	2.3	6.1
Excess tax benefit (deficiency) from equity compensation awards	0.1	(0.2)
Net cash provided by (used in) financing activities	(67.5)	84.3
Effect of exchange rate changes on cash and cash equivalents	(20.0)	(6.1)
Net change in cash and cash equivalents	(147.7)	60.4
Cash and cash equivalents, beginning of the year	266.8	159.6
Cash and cash equivalents, end of period	119.1	220.0
Supplemental cash flow information:
Interest paid, net of amounts capitalized	18.6	10.8
Income taxes paid, net of refunds	$ 83.5	33.2
Fair value of assets acquired		99.2
Cash paid during the nine months ended September 30, 2014		(86.5)
Liabilities assumed		$ 12.7

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Goderich Tornado (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended	38 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2014
Goderich Tornado [Abstract]
Total insurance advances			$ 114.9
Deferred revenue		$ 28.6
Total insurance advances received and recorded as reduction to salt product costs			26.9
Insurance proceeds for replacement of property, plant and equipment and business interruption			83.3
Deferred released in connection with settlement	$ 83.3		$ 83.3
Gain recorded as reduction to production cost	82.3
Gain recorded as reduction to selling, general and administrative expenses	$ 1.0

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Stockholders' Equity and Equity Instruments - Plan Information (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2015 shares	Sep. 30, 2015 USD ($) award_type $ / shares shares	Sep. 30, 2014 USD ($)	May. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued shares of treasury stock (in shares)		31,141
Tax benefit from equity compensation awards recorded as additional paid-in capital | $		$ 0.1
Compensation expense recorded during period pursuant to stock-based compensation plans | $		$ 4.9	$ 3.7
2015 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)				3,000,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)		120,956
Vesting period		4 years
Options expiration period		7 years
Fair value measurement method		Black-Scholes option valuation model
Weighted-average grant date fair value of options (in dollars per share) | $ / shares		$ 14.78
Reissued shares of treasury stock (in shares)		31,104
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		19,492
Vesting period		3 years
Reissued shares of treasury stock (in shares)		15,952
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		35,584
Vesting period		3 years
Performance period of PSUs		3 years
Minimum percentage of earnings (in hundredths)		0.00%
Maximum percentage of earnings (in hundredths)		150.00%
Number of award types | award_type		2
PSUs [Member] | 2012 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued shares of treasury stock (in shares)	10,454	10,454
TSR PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs		3 years
Fair value measurement method		Monte-Carlo simulation model
ROIC PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs		3 years

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CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 119.1	$ 266.8
Receivables, less allowance for doubtful accounts of $1.4 in 2015 and 2014	138.1	213.0
Inventories	268.7	199.0
Deferred income taxes, net	8.4	9.7
Other	19.9	14.2
Total current assets	554.2	702.7
Property, plant and equipment, net	762.9	700.9
Intangible assets, net	93.6	106.2
Goodwill	60.0	68.5
Other	58.0	58.9
Total assets	1,528.7	1,637.2
Current liabilities:
Current portion of long-term debt	3.9	3.9
Accounts payable	77.9	97.6
Accrued expenses	65.8	60.6
Accrued salaries and wages	19.9	24.4
Income taxes payable	5.5	44.4
Accrued interest	3.0	6.8
Total current liabilities	176.0	237.7
Long-term debt, net of current portion	619.6	622.5
Deferred income taxes, net	81.7	88.9
Other noncurrent liabilities	$ 31.4	$ 34.5
Commitments and contingencies
Stockholders' equity:
Common stock: $0.01 par value, 200,000,000 authorized shares; 35,367,264 issued shares	$ 0.4	$ 0.4
Additional paid-in capital	89.9	82.5
Treasury stock, at cost — 1,669,346 shares at September 30, 2015 and 1,757,997 shares at December 31, 2014	(3.2)	(3.3)
Retained earnings	623.1	589.5
Accumulated other comprehensive loss	(90.2)	(15.5)
Total stockholders' equity	620.0	653.6
Total liabilities and stockholders' equity	$ 1,528.7	$ 1,637.2

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Derivative Financial Instruments (Details) MMBTU in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) MMBTU counterparty	Dec. 31, 2014 USD ($) MMBTU counterparty
Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0.1	$ 0.1
Liability Derivatives	$ 2.7	$ 3.5
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Underlying risk	change in natural gas prices
Period through which natural gas is hedged	Dec. 31, 2016
Percent of forecasted usage to be hedged (up to 90%)	90.00%
Maximum period which the Company hedges in advance of forecasted purchase	36 months
Notional amount (in MMBtus) | MMBTU	1.9	3.4
Net losses to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months	$ 2.1
Number of counterparties | counterparty	4	4
Number of counterparties for amounts recorded as liabilities | counterparty	3
Number of counterparties for amounts recorded as assets | counterparty		2
Netting of contracts in a receivable position against contracts in payable position		$ 0.1
Commodity Contracts [Member] | Designated as Hedging Instruments [Member] | Other Current Asset [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0.1	0.1
Commodity Contracts [Member] | Designated as Hedging Instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.0	0.0
Commodity Contracts [Member] | Designated as Hedging Instruments [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	2.2	2.5
Commodity Contracts [Member] | Designated as Hedging Instruments [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0.5	$ 1.0

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gain from change in pension obligations, tax	$ (0.1)	$ (0.1)	$ (0.2)	$ (0.3)
Unrealized gain (loss) on cash flow hedges, tax	$ 0.1	$ 0.3	$ (0.3)	$ 0.2

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Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 1.0	$ 1.3	$ 3.3	$ 3.1
Acquired Indefinite-lived Intangible Assets [Line Items]
Goodwill	60.0		60.0		$ 68.5
Plant Nutrition [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 53.6		$ 53.6		$ 62.0
Supply Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			50 years
SOP Production Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			25 years
Patents [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			10 years
Patents [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			20 years
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			5 years
Lease Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			25 years
Customer and Distributor Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			10 years
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			10 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Lives			5 years

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Accounting Policies and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements – In July 2015, the Financial Accounting Standards Board ("FASB") issued guidance that requires entities to measure inventory within the scope of the standard at the lower of cost or net realizable value. "Net realizable value" is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early adoption is permitted. The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In April 2015, the FASB issued guidance about whether fees paid by customers in cloud computing arrangements include a software license.  If a cloud computing arrangement includes a software license, a customer should account for the software license element in a manner consistent with previously issued guidance for software licenses.  If the arrangement does not include a software license, a customer should account for the arrangement as a service contract.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015.  An entity can adopt the guidance prospectively or retrospectively and early adoption is permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In April 2015, the FASB issued guidance which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the related debt liability rather than an asset.  The recognition and measurement guidance for debt issuance costs are not affected by this guidance.  This new guidance is effective retrospectively for fiscal years, and interim periods within those years, beginning after December 15, 2015.  Early adoption is permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In August 2014, the FASB issued guidance which requires management to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide disclosure in the footnotes under certain circumstances.  This guidance is effective for fiscal years ending after December 15, 2016 with early adoption permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.

In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers.  The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services.  This guidance is effective for fiscal years and interim periods with those years beginning after December 15, 2017 and early adoption is not permitted.  The guidance permits the use of either a full or modified retrospective or cumulative effect transition method.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.

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Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Foreign Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 3.8	$ 3.8
Foreign Federal 2033 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 8.0	2.3
Expiration date	Dec. 31, 2033
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 1.0	$ 0.3
Expiration date	Dec. 31, 2033
Canadian Provincial [Member]
Income Tax Examination [Line Items]
Total reassessments including interest	$ 80.0
Amount of security posted in the form of a performance bond	50.0
Amount of security posted in the form of cash	$ 28.0
Canadian Provincial [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Years under examination	2002
Canadian Provincial [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Years under examination	2009
Canadian Federal and Provincial [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Amount of security posted in the form of a performance bond	$ 18.0
Total reassessment amount including penalty and interest	89.0
Amount of security in the form of a bank letter guarantee	36.0
Canadian Federal and Provincial [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Amount of security posted in the form of a performance bond	10.0
Total reassessment amount including penalty and interest	31.0
Amount of security in the form of a bank letter guarantee	$ 10.0
Canadian Federal and Provincial [Member] | Minimum [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Years under examination	2004
Canadian Federal and Provincial [Member] | Minimum [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Years under examination	2007
Canadian Federal and Provincial [Member] | Maximum [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Years under examination	2006
Canadian Federal and Provincial [Member] | Maximum [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Years under examination	2008

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Property, Plant and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Property, plant and equipment, net consists of the following (in millions):

	September 30, 2015			December 31, 2014
Land, buildings and structures and leasehold improvements	$	347.3		$	352.2
Machinery and equipment	696.7			669.1
Office furniture and equipment	19.6			17.5
Mineral interests	171.7			179.6
Construction in progress	164.2			108.9
	1,399.5			1,327.3
Less accumulated depreciation and depletion	(636.6		)	(626.4		)
Property, plant and equipment, net	$	762.9		$	700.9

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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - 9 months ended Sep. 30, 2015 - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2014	$ 653.6	$ 0.4	$ 82.5	$ (3.3)	$ 589.5	$ (15.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common stock/equity awards	(67.0)		0.2		(67.2)
Stock options exercised	2.3		2.2	0.1
Income tax benefit from equity awards	0.1		0.1
Stock-based compensation	4.9		4.9
Comprehensive income (loss)	26.1				100.8	(74.7)
Balance at Sep. 30, 2015	$ 620.0	$ 0.4	$ 89.9	$ (3.2)	$ 623.1	$ (90.2)

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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Allowance for doubtful accounts	$ 1.4	$ 1.4
Stockholders' equity:
Common Stock, par or stated value per share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	200,000,000	200,000,000
Common Stock, shares issued (in shares)	35,367,264	35,367,264
Treasury stock, shares (in shares)	1,669,346	1,757,997

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Operating Segments

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Operating Segments

Operating Segments:

The Company broadened its portfolio of specialty plant nutrient products with the acquisition of Wolf Trax Inc. (renamed Compass Minerals Manitoba, Inc. or “Compass Manitoba”) in the second quarter of 2014.  This acquisition expands the Company’s portfolio of specialty crop nutrient products and further differentiates it from commodity fertilizers.  The results of operations and financial position for Compass Manitoba have been included in the Company’s plant nutrition segment from the date of the acquisition.  Segment information is as follows (in millions):

	Three Months Ended September 30, 2015
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	179.9	$	50.2	$	2.6		$	232.7
Intersegment sales	—		1.6		(1.6		)	—
Shipping and handling cost	48.5		4.7		—			53.2
Operating earnings (loss)	45.0		8.8		(13.0		)	40.8
Depreciation, depletion and amortization	11.1		7.6		0.9			19.6
Total assets (as of end of period)	898.2		568.9		61.6			1,528.7

	Three Months Ended September 30, 2014
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	175.4	$	62.7	$	2.4		$	240.5
Intersegment sales	0.3		1.5		(1.8		)	—
Shipping and handling cost	51.6		5.9		—			57.5
Operating earnings (loss) (b)	116.7		19.0		(12.7		)	123.0
Depreciation, depletion and amortization	11.4		7.1		1.5			20.0
Total assets (as of end of period)	970.1		517.7		58.7			1,546.5

	Nine Months Ended September 30, 2015
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	612.9	$	187.9	$	8.6		$	809.4
Intersegment sales	0.1		5.1		(5.2		)	—
Shipping and handling cost	178.1		17.8		—			195.9
Operating earnings (loss)	143.1		46.4		(40.0		)	149.5
Depreciation, depletion and amortization	32.9		21.7		3.2			57.8

	Nine Months Ended September 30, 2014
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	647.3	$	194.4	$	7.4		$	849.1
Intersegment sales	0.7		4.7		(5.4		)	—
Shipping and handling cost	211.7		21.3		—			233.0
Operating earnings (loss) (b)	187.0		53.2		(36.8		)	203.4
Depreciation, depletion and amortization	33.5		20.0		3.7			57.2

(a) Corporate and Other includes corporate entities, records management operations and other incidental operations and eliminations.  Operating earnings (loss) for corporate and other includes indirect corporate overhead including costs for general corporate governance and oversight, as well as costs for the human resources, information technology and finance functions.

(b) Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 23, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	COMPASS MINERALS INTERNATIONAL INC
Entity Central Index Key	0001227654
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,701,533
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015

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Stockholders' Equity and Equity Instruments

9 Months Ended

Sep. 30, 2015

Equity [Abstract]

Stockholders' Equity and Equity Instruments

Stockholders' Equity and Equity Instruments:

In the first nine months of 2015, the Company granted 120,956 stock options, 19,492 restricted stock units (“RSUs”) and 35,584 performance stock units (“PSUs”) to certain employees under its 2005 Incentive Award Plan.  The Company’s closing stock price on the grant date was used to set the exercise price for the options and the fair value of the RSUs.  The options vest ratably on each anniversary date over a four-year service period. Unexercised options expire after seven years. The RSUs vest on the third anniversary following the grant date. None of the awards granted have voting rights.  The RSUs granted entitle the holders to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock for RSUs earned.  In May 2015, the Company’s shareholders approved the 2015 Incentive Award Plan, which authorizes the issuance of 3,000,000 shares.  Since the date the 2015 Incentive Award Plan was approved, the Company ceased issuing equity awards under the 2005 Incentive Award Plan.

The PSUs granted in the first nine months of 2015 have a three-year performance period beginning in 2015 and ending in 2017 and earn units of between 0% and 150% based upon the attainment of certain performance conditions.  The Company granted two types of PSUs in the first nine months of 2015.  The total shareholder return PSU (“TSR PSU”) is earned by determining the Company’s total shareholder return, compared to the total shareholder return for each company comprising the Russell 3000 Index over the three-year performance period.  The return on invested capital PSU (“ROIC PSU”) is earned by averaging the Company’s annual return on invested capital over the three-year performance period.  The performance units will vest three years after the grant date.  The PSUs granted entitle the holders to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock from the grant date through the vest date for PSUs earned.

To estimate the fair value of options on the grant date, the Company uses the Black-Scholes option valuation model.  Award recipients are grouped according to expected exercise behavior. Unless better information is available to estimate the expected term of the options, the estimate is based on historical exercise experience. The risk-free rate, using U.S. Treasury yield curves in effect at the time of grant, is selected based on the expected term of each group. The Company’s historical stock price is used to estimate expected volatility.  The range of estimates and calculated fair values for options granted during the first nine months of 2015 is included in the table below. The weighted-average grant date fair value of these options was $14.78.

	Range
Fair value of options granted	$ 14.22 - $15.09
Exercise price	$ 91.75 - $93.26
Expected term (years)	4.5-5
Expected volatility	24.7% - 25.0%
Dividend yield	3.1%
Risk-free rate of return	1.3% - 1.6 %

To estimate the fair value of the TSR PSUs on the grant date, the Company uses a Monte-Carlo simulation model, which simulates future stock prices of the Company as well as the companies comprising the Russell 3000 Index.  This model uses historical stock prices to estimate expected volatility and the Company’s correlation to the Russell 3000 Index.  The risk-free rate was determined using the same methodology as the option valuations as discussed above. The estimated fair value of the TSR PSUs granted in 2015 is $111.07 per unit.  The Company’s closing stock price on the grant date was used to set the fair value of the ROIC PSUs.  The Company will adjust the expense of the ROIC PSUs based upon its estimate of the number of shares that will ultimately vest at each interim date during the three-year vesting period.

During the nine months ended September 30, 2015, the Company reissued 31,104 shares of treasury stock related to the exercise of stock options, 15,952 shares related to the release of RSUs which vested, 10,454 shares related to the release of PSUs which vested and 31,141 shares related to stock payments.  The Company recognized a tax benefit of $0.1 million from its equity compensation awards as an increase to additional paid-in capital during the first nine months of 2015. During the first nine months of 2015 and 2014, the Company recorded $4.9 million and $3.7 million, respectively, of compensation expense pursuant to its stock-based compensation plans.  No amounts have been capitalized. The following table summarizes stock-based compensation activity during the nine months ended September 30, 2015.

	Stock Options				RSUs				PSUs(a)
	Number		Weighted-average exercise price		Number		Weighted-average fair value		Number		Weighted-average fair value
Outstanding at December 31, 2014	278,429		$	79.23	88,532		$	76.58	59,627		$	88.69
Granted	120,956		91.76		19,492		91.76		35,584		100.49
Exercised (b)	(31,104	)	72.20		—		—		—		—
Released from restriction (b)	—		—		(15,952	)	71.69		(10,454	)	74.49
Cancelled/Expired	(9,060	)	84.81		(2,188	)	81.56		(6,689	)	81.47
Outstanding at September 30, 2015	359,221		$	83.88	89,884		$	80.62	78,068		$	96.59

(a) Until they vest, PSUs are included in the table at the 100% attainment level at their grant date and at that level represent one share per unit.  The final performance period for the 2012 PSU grant was completed in 2014.  The Company issued 10,454 shares and cancelled 4,443 PSUs due to performance in the first quarter of 2015 related to the 2012 PSU grant.

(b) Common stock issued for exercised options and RSUs and PSUs released from restriction was issued from treasury stock.

Other Comprehensive Income (Loss)

The Company’s comprehensive income (loss) is comprised of net earnings, net amortization of the unrealized loss of the pension obligation, the change in the unrealized gain (loss) on natural gas cash flow hedges and foreign currency translation adjustments.  The components of and changes in accumulated other comprehensive income (loss) (“AOCI”) as of and for the three and nine months ended September 30, 2015 and 2014 are as follows (in millions):

Three Months Ended September 30, 2015 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	(1.5	)	$	(8.4	)	$	(43.1	)	$	(53.0	)
Other comprehensive income (loss) before reclassifications (b)	(0.3		)	—			(37.4		)	(37.7		)
Amounts reclassified from accumulated other comprehensive income (loss)	0.3			0.2			—			0.5
Net current period other comprehensive income (loss)	—			0.2			(37.4		)	(37.2		)
Ending balance	$	(1.5	)	$	(8.2	)	$	(80.5	)	$	(90.2	)

Three Months Ended September 30, 2014 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	0.4		$	(8.7	)	$	46.9		$	38.6
Other comprehensive income (loss) before reclassifications (b)	(0.5		)	—			(28.4		)	(28.9		)
Amounts reclassified from accumulated other comprehensive income (loss)	—			0.3			—			0.3
Net current period other comprehensive income (loss)	(0.5		)	0.3			(28.4		)	(28.6		)
Ending balance	$	(0.1	)	$	(8.4	)	$	18.5		$	10.0

Nine Months Ended September 30, 2015 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	(2.0	)	$	(9.0	)	$	(4.5	)	$	(15.5	)
Other comprehensive income (loss) before reclassifications (b)	(0.9		)	—			(76.0		)	(76.9		)
Amounts reclassified from accumulated other comprehensive income (loss)	1.4			0.8			—			2.2
Net current period other comprehensive income (loss)	0.5			0.8			(76.0		)	(74.7		)
Ending balance	$	(1.5	)	$	(8.2	)	$	(80.5	)	$	(90.2	)

Nine Months Ended September 30, 2014 (a)	Gains and (Losses) on Cash Flow Hedges			Defined Benefit Pension			Foreign Currency			Total
Beginning balance	$	0.3		$	(9.3	)	$	43.5		$	34.5
Other comprehensive income (loss) before reclassifications (b)	0.2			—			(25.0		)	(24.8		)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.6		)	0.9			—			0.3
Net current period other comprehensive income (loss)	(0.4		)	0.9			(25.0		)	(24.5		)
Ending balance	$	(0.1	)	$	(8.4	)	$	18.5		$	10.0

(a) With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.

(b) The Company recorded foreign exchange (gains) losses of approximately $13.0 million and $27.6 million in the three months and nine months ended September 30, 2015, respectively, and $10.4 million and $10.8 million in the three and nine months ended September 30, 2014, respectively, in accumulated other comprehensive income (loss) related to intercompany notes which were deemed to be of long-term investment nature.

The amounts reclassified from AOCI to (income) expense for the three and nine months ended September 30, 2015 and 2014 are shown below (in millions):

	Amount Reclassified from AOCI
	Three Months Ended September 30, 2015			Nine Months Ended September 30, 2015			Line Item Impacted in the Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments	$	0.5		$	2.2		Product cost
	(0.2		)	(0.8		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.3			1.4
Amortization of defined benefit pension:
Amortization of loss	$	0.3		$	1.0		Product cost
	(0.1		)	(0.2		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.2			0.8
Total reclassifications, net of income taxes	$	0.5		$	2.2

	Amount Reclassified from AOCI
	Three Months Ended September 30, 2014			Nine Months Ended September 30, 2014			Line Item Impacted in the Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments	$	(0.1	)	$	(1.0	)	Product cost
	0.1			0.4			Income tax expense (benefit)
Reclassifications, net of income taxes	—			(0.6		)
Amortization of defined benefit pension:
Amortization of loss	$	0.4		$	1.2		Product cost
	(0.1		)	(0.3		)	Income tax expense (benefit)
Reclassifications, net of income taxes	0.3			0.9
Total reclassifications, net of income taxes	$	0.3		$	0.3

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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Sales	$ 232.7	$ 240.5	$ 809.4	$ 849.1
Shipping and handling cost	53.2	57.5	195.9	233.0
Product cost	111.5	33.2	381.7	336.5
Gross profit	68.0	149.8	231.8	279.6
Selling, general and administrative expenses	27.2	26.8	82.3	76.2
Operating earnings	40.8	123.0	149.5	203.4
Other (income) expense:
Interest expense	5.4	5.5	16.1	14.4
Other, net	(4.3)	(3.1)	(9.0)	0.9
Earnings before income taxes	39.7	120.6	142.4	188.1
Income tax expense	12.7	32.7	41.6	50.7
Net earnings	$ 27.0	$ 87.9	$ 100.8	$ 137.4
Basic net earnings per common share (in dollars per share)	$ 0.80	$ 2.60	$ 2.98	$ 4.07
Diluted net earnings per common share (in dollars per share)	$ 0.80	$ 2.60	$ 2.97	$ 4.07
Weighted-average common shares outstanding (in thousands):
Basic (in shares)	33,696	33,575	33,668	33,542
Diluted (in shares)	33,708	33,601	33,687	33,566
Cash dividends per share (in dollars per share)	$ 0.66	$ 0.60	$ 1.98	$ 1.8

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Property, Plant and Equipment, Net

9 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, Net

Property, Plant and Equipment, Net:

Property, plant and equipment, net consists of the following (in millions):

	September 30, 2015			December 31, 2014
Land, buildings and structures and leasehold improvements	$	347.3		$	352.2
Machinery and equipment	696.7			669.1
Office furniture and equipment	19.6			17.5
Mineral interests	171.7			179.6
Construction in progress	164.2			108.9
	1,399.5			1,327.3
Less accumulated depreciation and depletion	(636.6		)	(626.4		)
Property, plant and equipment, net	$	762.9		$	700.9

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Inventories

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Inventories

Inventories:

Inventories consist of the following (in millions):

	September 30, 2015		December 31, 2014
Finished goods	$	218.1	$	148.5
Raw materials and supplies	50.6		50.5
Total inventories	$	268.7	$	199.0

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Inventories (Tables)

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following (in millions):

	September 30, 2015		December 31, 2014
Finished goods	$	218.1	$	148.5
Raw materials and supplies	50.6		50.5
Total inventories	$	268.7	$	199.0

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments:

The Company is subject to various types of market risks including interest rate risk, foreign currency exchange rate transaction and translation risk, and commodity pricing risk.  Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments.  Currently, the Company manages a portion of its commodity pricing risk by using derivative instruments.  The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangements. The Company has entered into natural gas derivative instruments with counterparties it views as creditworthy.  However, management does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with these counterparties.

Cash Flow Hedges

As of September 30, 2015, the Company has entered into natural gas derivative instruments. The Company records derivative financial instruments as either assets or liabilities at fair value in the consolidated statements of financial position.  Derivatives qualify for treatment as hedges when there is a high correlation between the change in fair value of the derivative instrument and the related change in value of the underlying hedged item. Depending on the exposure being hedged, the Company must designate the hedging instrument as a fair value hedge, a cash flow hedge or a net investment in foreign operations hedge.  All derivative instruments held by the Company as of September 30, 2015 and December 31, 2014 qualified as cash flow hedges. For these qualifying hedges, the effective portion of the change in fair value is recognized through earnings when the underlying transaction being hedged affects earnings, allowing a derivative’s gains and losses to offset related results from the hedged item in the statements of operations (see Note 10). For derivative instruments that are not accounted for as hedges, or for the ineffective portions of qualifying hedges, the change in fair value is recorded through earnings in the period of change. The Company formally documents, designates, and assesses the effectiveness of transactions that receive hedge accounting treatment initially and on an ongoing basis.  Any ineffectiveness related to these hedges was not material for any of the periods presented.

Natural gas is consumed at several of the Company’s production facilities, and a change in natural gas prices impacts the Company’s operating margin.  As of September 30, 2015, the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through December 2016.  The Company’s objective is to reduce the earnings and cash flow impacts of changes in market prices of natural gas by fixing the purchase price of up to 90% of its forecasted natural gas usage.  It is the Company’s policy to consider hedging portions of its natural gas usage up to 36 months in advance of the forecasted purchase. As of September 30, 2015 and December 31, 2014, the Company had agreements in place to hedge forecasted natural gas purchases of 1.9 million and 3.4 million MMBtus, respectively.

As of September 30, 2015, the Company expects to reclassify from accumulated other comprehensive loss to earnings during the next twelve months approximately $2.1 million of net losses on derivative instruments related to its natural gas hedges.

The following tables present the fair value of the Company’s hedged items as of September 30, 2015 and December 31, 2014, (in millions):

	Asset Derivatives			Liability Derivatives
Derivatives designated as hedging instruments(a) (b)	Balance Sheet Location	September 30, 2015		Balance Sheet Location	September 30, 2015
Commodity contracts	Other current assets	$	0.1	Accrued expenses	$	2.2
Commodity contracts	Other assets	—		Other noncurrent liabilities	0.5
Total derivatives designated as hedging instruments		$	0.1		$	2.7

(a) As of September 30, 2015, the Company has commodity hedge agreements with four counterparties.  Three of the counterparties are in payable positions.

(b) The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.

	Asset Derivatives			Liability Derivatives
Derivatives designated as hedging instruments(a) (b)	Balance Sheet Location	December 31, 2014		Balance Sheet Location	December 31, 2014
Commodity contracts	Other current assets	$	0.1	Accrued expenses	$	2.5
Commodity contracts	Other assets	—		Other noncurrent liabilities	1.0
Total derivatives designated as hedging instruments		$	0.1		$	3.5

(a) The Company has commodity hedge agreements with four counterparties.  Amounts recorded as liabilities for the Company’s commodity contracts are payable to all counterparties.  The amount recorded as an asset is due from two counterparties.

(b) The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets approximately $0.1 million of its commodity contracts that are in a receivable position against its contracts in payable positions.

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Long-term Debt

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-term Debt

Long-term Debt:

Long-term debt consists of the following (in millions):

	September 30, 2015			December 31, 2014
Term Loan due May 2017	$	373.5		$	376.4
Revolving Credit Facility due August 2017	—			—
4.875% Senior Notes due July 2024	250.0			250.0
	623.5			626.4
Less current portion	(3.9		)	(3.9		)
Long-term debt	$	619.6		$	622.5

The term loan and revolving credit facility are secured by substantially all existing and future assets of the Company’s subsidiaries.

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Goodwill and Intangible Assets, Net

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, Net

Goodwill and Intangible Assets, Net:

The estimated lives of the Company’s intangible assets are as follows:

Intangible asset	Estimated Lives
Supply agreement	50 years
SOP production rights	25 years
Patents	10-20 years
Developed technology	5 years
Lease rights	25 years
Customer and distributor relationships	10 years
Trademarks	10 years
Noncompete agreements	5 years
Trade names	Indefinite
Water rights	Indefinite

None of the finite-lived intangible assets have a residual value. Aggregate amortization expense was $1.0 million and $1.3 million in the third quarters of 2015 and 2014, respectively, and $3.3 million and $3.1 million in the first nine months of 2015 and 2014, respectively.

The Company has goodwill of $60.0 million and $68.5 million as of September 30, 2015 and December 31, 2014 in its consolidated balance sheets.  Approximately $53.6 million and $62.0 million of the amounts recorded for goodwill as of September 30, 2015 and December 31, 2014, respectively, were recorded in the Company’s plant nutrition segment and the remaining amounts in both periods were immaterial and recorded in its salt segment and corporate and other.  The change in goodwill from December 31, 2014 was due to the impact from translating foreign-denominated amounts to U.S. dollars.

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Income Taxes

9 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes:

The Company’s effective income tax rate differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, state income taxes (net of federal tax benefit), foreign income tax rate differentials, foreign mining taxes, domestic manufacturing deductions, and interest expense recognition differences for book and tax purposes.  The Company’s effective rate is impacted by permanent tax deductions which have a less favorable impact as pretax income increases.

At both September 30, 2015 and December 31, 2014, the Company had approximately $3.8 million of gross foreign federal net operating loss (“NOL”) carryforwards that have no expiration date.  In addition, the Company had $8.0 million and $2.3 million as of September 30, 2015 and December 31, 2014, respectively, of gross foreign federal NOL carryforwards which expire beginning in 2033 and $1.0 million and $0.3 million as of September 30, 2015 and December 31, 2014, respectively, of tax-effected state NOL carryforwards which expire beginning in 2033. In the future, if the Company determines, based on the existence of sufficient evidence, that it should realize more or less of its deferred tax assets, an adjustment to any existing valuation allowance will be made in the period such determination is made.

Canadian provincial tax authorities have challenged tax positions claimed by one of the Company’s Canadian subsidiaries and have issued tax reassessments for years 2002-2009.  The reassessments are a result of ongoing audits and total approximately $80 million, including interest through September 30, 2015.  The Company disputes these reassessments and plans to continue to work with the appropriate authorities in Canada to resolve the dispute.  There is a reasonable possibility that the ultimate resolution of this dispute, and any related disputes for other open tax years, may be materially higher or lower than the amounts the Company has reserved for such disputes.  In connection with this dispute, local regulations require the Company to post security with the tax authority until the dispute is resolved.  The Company and the tax authority have agreed that it will post collateral in the form of a $50 million performance bond.  The Company has paid approximately $28 million (most of which is recorded in other assets in the consolidated balance sheets) with the remaining balance to be paid after 2015. 

In addition, Canadian federal and provincial taxing authorities have reassessed the Company for years 2004-2006 which have been previously settled by agreement among the Company, the Canadian federal taxing authority and the U.S. federal taxing authority.  The Company has fully complied with the agreement since entering into it and it believes this action is highly unusual.  The Company is seeking to enforce the agreement which provided the basis upon which the returns were previously filed and settled.  The total amount of the reassessments, including penalties and interest through September 30, 2015, related to this matter is approximately $89 million.  The Company has agreed to post collateral in the form of an approximately $18 million performance bond and $36 million in the form of a bank letter guarantee which is necessary to proceed with future appeals or litigation.

The Company received Canadian income tax reassessments for years 2007-2008.  The total amount of the reassessments, including penalties and interest through September 30, 2015, related to this matter is approximately $31 million.  The Company does not agree with these adjustments and has filed for assistance from the tax jurisdictions for relief from the impact of double taxation as available in the tax treaty between the U.S. and Canada.  The Company has filed protective Notices of Objection and has agreed to post collateral of an approximately $10 million performance bond and $10 million in the form of a bank letter guarantee which is necessary to proceed with future appeals or litigation.  Although the outcome of examinations by taxing authorities is uncertain, the Company believes it has adequately reserved for this matter.

The Company will be required by the same local regulations to provide security for additional interest on the above disputed amounts and for any future reassessments issued by these Canadian tax authorities in the form of cash, letters of credit, performance bonds, asset liens or other arrangements agreeable with the tax authorities until the dispute is resolved.

The Company expects that the ultimate outcome of these matters will not have a material impact on its results of operations or financial condition. However, the Company can provide no assurance as to the ultimate outcome of these matters and the impact could be material if they are not resolved in the Company’s favor.  As of September 30, 2015, the amount reserved related to these reassessments was immaterial to the Company’s consolidated financial statements.

Additionally, the Company has other uncertain tax positions as well as assessments and disputed positions with taxing authorities in its various jurisdictions.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies:

The Company is involved in legal and administrative proceedings and claims of various types from normal Company activities.

The Company is aware of an aboriginal land claim filed in 2003 by The Chippewas of Nawash and The Chippewas of Saugeen (the “Chippewas”) in the Ontario Superior Court against The Attorney General of Canada and Her Majesty The Queen In Right of Ontario. The Chippewas claim that a large part of the land under Lake Huron was never surrendered by treaty and thus seek a declaration that the Chippewas hold aboriginal title to those submerged lands.  The land to which aboriginal title is claimed includes land under which the Company’s Goderich mine operates and has mining rights granted to it by the government of Ontario. The actions also seek damages for the value and loss of use of lands.  The Company is not a party to the court actions. The Company understands that the Canadian and Ontario governments are defending the actions for aboriginal title on the basis, among other things, that common law does not recognize aboriginal title to the Great Lakes and other navigable waterways.

Similar claims are pending with respect to other parts of the Great Lakes by other aboriginal claimants. The Company has been informed by the Ministry of The Attorney General of Ontario that “Canada takes the position that the common law does not recognize aboriginal title to the Great Lakes and its connecting waterways.”

The Company is involved in proceedings alleging unfair labor practices at its Cote Blanche, Louisiana, mine.  This matter arises out of a labor dispute between the Company and the United Steelworkers Union over the terms of a new contract for certain employees at the mine. These employees initiated a strike that began on April 7, 2010, and ended on June 15, 2010.  In September 2012, the U.S. National Labor Relations Board issued a decision finding that the Company had committed unfair labor practices in connection with the labor dispute.  Under the ruling, the Company is responsible for back pay to affected employees as a result of changes made in union work rules and past practices beginning April 1, 2010.  Any requirement for the Company to pay back wages will be offset by any wages earned at other places of employment during this period.  In the fourth quarter of 2013, this ruling was upheld by an appeals court and the Company recorded a reserve of approximately $5 million in its consolidated financial statements related to expected payments required to resolve the dispute.

In the first quarter of 2015, additional information became available and the Company recorded an additional $2 million reserve for this matter in its consolidated financial statements.  Both parties are currently negotiating in an effort to reach a settlement. If the Company is unable to come to terms with the union, the parties may agree to arbitration and any decisions reached in arbitration would be binding.  The Company may need to record additional losses in its financial statements as a result of future developments.

The Wisconsin Department of Agriculture, Trade and Consumer Protection (“DATCP”) has information indicating that agricultural chemicals are present within the subsurface area of the Kenosha, Wisconsin plant. The agricultural chemicals were used by previous owners and operators of the site.  None of the identified chemicals have been used in association with Compass Minerals’ operations since it acquired the property in 2002.  DATCP directed the Company to conduct further investigations into the possible presence of agricultural chemicals in soil and ground water at the Kenosha plant.  The Company has completed such investigations of the soils and ground water and has provided the findings to DATCP. The Company is presently proceeding with select remediation activities to mitigate agricultural chemical impact to soils and ground water at the site.  All investigations and mitigation activities to date, and any potential future remediation work, are being conducted under the Wisconsin Agricultural Chemical Cleanup Program (“ACCP”), which would provide for reimbursement of some of the costs. The Company may seek participation by, or cost reimbursement from, the parties responsible for the presence of any agricultural chemicals found in soil and ground water at this site if the Company does not receive an acknowledgment of no further action and is required to conduct further investigation or remedial work that may not be eligible for reimbursement under the ACCP.

The Company does not believe that these actions will have a material adverse financial effect on the Company. Furthermore, while any litigation contains an element of uncertainty, management presently believes that the outcome of each such proceeding or claim, which is pending or known to be threatened, or all of them combined, will not have a material adverse effect on the Company’s results of operations, cash flows or financial position.

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Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,399.5	$ 1,327.3
Less accumulated depreciation and depletion	(636.6)	(626.4)
Property, plant and equipment, net	762.9	700.9
Land, Buildings and Structures and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	347.3	352.2
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	696.7	669.1
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19.6	17.5
Mineral Interests [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	171.7	179.6
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 164.2	$ 108.9

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Earnings per Share

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Earnings per Share

Earnings per Share:

The Company calculates earnings per share using the two-class method.  The two-class method requires allocating the Company’s net earnings to both common shares and participating securities.  The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data):

	Three months ended September 30,						Nine months ended September 30,
	2015			2014			2015			2014
Numerator:
Net earnings	$	27.0		$	87.9		$	100.8		$	137.4
Less: net earnings allocated to participating securities (a)	(0.1		)	(0.5		)	(0.6		)	(0.8		)
Net earnings Available to common shareholders	$	26.9		$	87.4		$	100.2		$	136.6
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share	33,696			33,575			33,668			33,542
Weighted-average awards outstanding (b)	12			26			19			24
Shares for diluted earnings per share	33,708			33,601			33,687			33,566
Net earnings per common share, basic	$	0.80		$	2.60		$	2.98		$	4.07
Net earnings per common share, diluted	$	0.80		$	2.60		$	2.97		$	4.07

(a) Participating securities include options, PSUs and RSUs that receive non-forfeitable dividends. Weighted participating securities included 182,000 and 197,000 for the three and nine months ended September 30, 2015, respectively, and 209,000 and 214,000 for the three and nine months ended September 30, 2014, respectively.

(b) For the calculation of diluted earnings per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted average number of outstanding common shares.  In addition, the Company had 450,000 and 429,000 weighted-awards outstanding for the three and nine months ended September 30, 2015, respectively, and 389,000 and 397,000 for the three and nine months ended September 30, 2014, respectively, which were anti-dilutive and therefore not included in the diluted earnings per-share calculation.

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Long-term Debt (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-term debt

Long-term debt consists of the following (in millions):

	September 30, 2015			December 31, 2014
Term Loan due May 2017	$	373.5		$	376.4
Revolving Credit Facility due August 2017	—			—
4.875% Senior Notes due July 2024	250.0			250.0
	623.5			626.4
Less current portion	(3.9		)	(3.9		)
Long-term debt	$	619.6		$	622.5

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Stockholders' Equity and Equity Instruments - Fair Value, Exercise Price Range, and Accumulated Other Comprehensive Income (Details) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2015 $ / shares
Fair value assumptions and methodology [Abstract]
Lower limit of fair value of options granted (in dollars per share)	$ 14.22
Upper limit of fair value of options granted (in dollars per share)	$ 15.09
Lower limit of expected volatility (in hundredths)	24.70%
Upper limit of expected volatility (in hundredths)	25.00%
Dividend yield (in hundredths)	3.10%
Risk-free rate of return lower limit (in hundredths)	1.30%
Risk-free rate of return upper limit (in hundredths)	1.60%
Minimum [Member]
Fair value assumptions and methodology [Abstract]
Exercise price (in dollars per share)	$ 91.75
Expected term	4 years 6 months
Maximum [Member]
Fair value assumptions and methodology [Abstract]
Exercise price (in dollars per share)	$ 93.26
Expected term	5 years

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net earnings	$ 27.0	$ 87.9	$ 100.8	$ 137.4
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.1) and $(0.2) in the three and nine months ended September 30, 2015, respectively, and $(0.1) and $(0.3) in the three and nine months ended September 30, 2014, respectively	0.2	0.3	0.8	0.9
Unrealized gain (loss) on cash flow hedges, net of tax of $0.1 and $(0.3) in the three and nine months ended September 30, 2015, respectively, and $0.3 and $0.2 in the three and nine months ended September 30, 2014, respectively	0.0	(0.5)	0.5	(0.4)
Cumulative translation adjustment	(37.4)	(28.4)	(76.0)	(25.0)
Comprehensive income (loss)	$ (10.2)	$ 59.3	$ 26.1	$ 112.9

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Goderich Tornado

9 Months Ended

Sep. 30, 2015

Goderich Tornado [Abstract]

Goderich Tornado

Goderich Tornado:

In August 2011, a tornado struck the Company’s salt mine and its salt mechanical evaporation plant, both located in Goderich, Ontario, Canada. There was no damage to the underground operations at the mine. However, some of the mine’s surface structures and the evaporation plant incurred significant damage which temporarily ceased production at both facilities. Both facilities resumed normal production and shipping activities in 2012.

The Company recorded impairment of its property, plant and equipment and clean-up and restoration costs during 2011 through 2013 related to the impacted areas at both of the Goderich facilities. There were no material expenses or charges related to the tornado in 2014. In the third quarter of 2014, the Company resolved all contingencies and settled its insurance claim. The settlement included a substantial amount related to business interruption losses. Cumulatively, the Company received $114.9 million in cash, including approximately $28.6 million received in 2014 which was originally recorded as deferred revenue in the Company’s consolidated balance sheets. The insurance proceeds included approximately $26.9 million related to clean-up and restoration costs and asset impairment charges and approximately $83.3 million of proceeds for the replacement of property, plant and equipment and business interruption losses. In connection with the settlement, the Company released its deferred revenue balance of $83.3 million and recorded a gain of $82.3 million as a reduction to product cost and approximately $1.0 million as a reduction to selling, general and administrative expenses in its consolidated statements of operations for the third quarter of 2014. The difference between the cash received and the amounts recorded above relates to the foreign exchange impact from translating amounts from Canadian dollars to U.S. dollars.

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Operating Segments (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Segment information

Segment information is as follows (in millions):

	Three Months Ended September 30, 2015
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	179.9	$	50.2	$	2.6		$	232.7
Intersegment sales	—		1.6		(1.6		)	—
Shipping and handling cost	48.5		4.7		—			53.2
Operating earnings (loss)	45.0		8.8		(13.0		)	40.8
Depreciation, depletion and amortization	11.1		7.6		0.9			19.6
Total assets (as of end of period)	898.2		568.9		61.6			1,528.7

	Three Months Ended September 30, 2014
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	175.4	$	62.7	$	2.4		$	240.5
Intersegment sales	0.3		1.5		(1.8		)	—
Shipping and handling cost	51.6		5.9		—			57.5
Operating earnings (loss) (b)	116.7		19.0		(12.7		)	123.0
Depreciation, depletion and amortization	11.4		7.1		1.5			20.0
Total assets (as of end of period)	970.1		517.7		58.7			1,546.5

	Nine Months Ended September 30, 2015
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	612.9	$	187.9	$	8.6		$	809.4
Intersegment sales	0.1		5.1		(5.2		)	—
Shipping and handling cost	178.1		17.8		—			195.9
Operating earnings (loss)	143.1		46.4		(40.0		)	149.5
Depreciation, depletion and amortization	32.9		21.7		3.2			57.8

	Nine Months Ended September 30, 2014
	Salt		Plant Nutrition		Corporate and Other (a)			Total
Sales to external customers	$	647.3	$	194.4	$	7.4		$	849.1
Intersegment sales	0.7		4.7		(5.4		)	—
Shipping and handling cost	211.7		21.3		—			233.0
Operating earnings (loss) (b)	187.0		53.2		(36.8		)	203.4
Depreciation, depletion and amortization	33.5		20.0		3.7			57.2

(a) Corporate and Other includes corporate entities, records management operations and other incidental operations and eliminations.  Operating earnings (loss) for corporate and other includes indirect corporate overhead including costs for general corporate governance and oversight, as well as costs for the human resources, information technology and finance functions.

(b) Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.

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Commitments and Contingencies (Details) - Cote Blanche [Member] - USD ($) $ in Millions	Mar. 31, 2015	Dec. 31, 2013
Loss Contingencies [Line Items]
Reserve for expected payments required to resolve the dispute		$ 5
Additional amount of reserve for expected payments required to resolve the dispute	$ 2

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Fair Value Measurements

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company’s financial instruments are measured and reported at their estimated fair value.  Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction.  When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (level one inputs), or absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (level two inputs). The Company does not have any unobservable inputs that are not corroborated by market inputs (level three inputs).

The Company holds marketable securities associated with its non-qualified retirement plan, which are valued based on readily available quoted market prices.  The Company utilizes derivative instruments to manage its risk of changes in natural gas prices.  The fair value of the natural gas derivative instruments are determined using market data of forward prices for all of the Company’s contracts.  The estimated fair values for each type of instrument are presented below (in millions).

	September 30, 2015			Level One			Level Two			Level Three
Asset Class:
Mutual fund investments in a non-qualified retirement plan(a)	$	1.6		$	1.6		$	—		$	—
Total Assets	$	1.6		$	1.6		$	—		$	—
Liability Class:
Liabilities related to non-qualified retirement plan	$	(1.6	)	$	(1.6	)	$	—		$	—
Derivatives – natural gas instruments	(2.6		)	—			(2.6		)	—
Total Liabilities	$	(4.2	)	$	(1.6	)	$	(2.6	)	$	—

(a) Includes mutual fund investments of approximately 20% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small-cap U.S. companies, approximately 5% in international companies, approximately 5% in bond funds, approximately 35% in short-term investments and approximately 30% in blended funds.

	December 31, 2014			Level One			Level Two			Level Three
Asset Class:
Mutual fund investments in a non-qualified retirement plan(a)	$	1.9		$	1.9		$	—		$	—
Total Assets	$	1.9		$	1.9		$	—		$	—
Liability Class:
Liabilities related to non-qualified retirement plan	$	(1.9	)	$	(1.9	)	$	—		$	—
Derivatives – natural gas instruments	(3.4		)	—			(3.4		)	—
Total Liabilities	$	(5.3	)	$	(1.9	)	$	(3.4	)	$	—

(a) Includes mutual fund investments of approximately 15% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of international companies, approximately 5% in bond funds, approximately 35% in short-term investments and approximately 40% in blended funds.

Cash and cash equivalents, accounts receivable (net of allowance for bad debts) and payables are carried at cost, which approximates fair value due to their liquid and short-term nature. The Company’s investments related to its nonqualified retirement plan of $1.6 million and $1.9 million as of September 30, 2015 and December 31, 2014, respectively, are stated at fair value based on quoted market prices.  As of September 30, 2015, the estimated amount a third-party would pay for the fixed-rate 4.875% senior notes due July 2024, based on available trading information, totaled $231.3 million (level two) compared with the aggregate principal amount at maturity of $250.0 million. The estimated amount a third-party would pay at September 30, 2015 for the amounts outstanding under the credit agreement, based upon available bid information received from the Company’s lender, totaled $369.8 million (level two) compared with the aggregate principal balance of $373.5 million.