Compass Minerals International (CMP) 10-Q 5 Nov 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 30, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-31921
Entity Registrant Name	Compass Minerals International, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3972986
Entity Address, Address Line One	9900 West 109th Street
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Overland Park
Entity Address, State or Province	KS
Entity Address, Postal Zip Code	66210
City Area Code	913
Local Phone Number	344-9200
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	CMP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		33,955,138
Entity Central Index Key	0001227654
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 34.1	$ 34.7
Receivables, less allowance for doubtful accounts of $8.2 in 2020 and $9.4 in 2019	194.2	342.4
Inventories	385.5	311.5
Other	71.6	96.4
Total current assets	685.4	785
Property, plant and equipment, net	944.8	1,030.8
Intangible assets, net	83.5	103
Goodwill	260.7	343
Investment in equity investee	24.4	24.9
Other	159	156.5
Total assets	2,157.8	2,443.2
Current liabilities:
Current portion of long-term debt	56.4	52.1
Accounts payable	121.5	126.2
Accrued salaries and wages	34.4	34.4
Income taxes payable	9	10.4
Accrued interest	16.4	11.3
Accrued expenses and other current liabilities	64.1	61.5
Total current liabilities	301.8	295.9
Long-term debt, net of current portion	1,289.2	1,363.9
Deferred income taxes, net	80.8	89.9
Other noncurrent liabilities	161.9	163.9
Commitments and contingencies (Note 9)
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	124.5	117.1
Treasury stock, at cost — 1,412,126 shares at September 30, 2020 and 1,481,611 shares at December 31, 2019	(4.4)	(3.2)
Retained earnings	560.1	607.4
Accumulated other comprehensive loss	(356.5)	(192.1)
Total stockholders’ equity	324.1	529.6
Total liabilities and stockholders’ equity	$ 2,157.8	$ 2,443.2

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Allowance for doubtful accounts	$ 8.2	$ 9.4
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)	1,412,126	1,481,611

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Sales	$ 282.4	$ 341.3	$ 952.4	$ 990.2
Gross profit	58.7	76.4	212.3	194.8
Selling, general and administrative expenses	41.3	46.3	126.2	127.4
Operating earnings	17.4	30.1	86.1	67.4
Other expense (income):
Interest expense	17.1	17.7	53.3	50.7
Net earnings in equity investee	(0.3)	(0.4)	(0.4)	(0.4)
Loss (gain) on foreign exchange	4.1	(1.8)	(5.2)	7.3
Other, net	(0.1)	(0.8)	(0.4)	(1.9)
(Loss) earnings before income taxes	(3.4)	15.4	38.8	11.7
Income tax (benefit) expense	(1.3)	4.8	11.6	5.3
Net (loss) earnings	$ (2.1)	$ 10.6	$ 27.2	$ 6.4
Basic net (loss) earnings per common share (in dollars per share)	$ (0.07)	$ 0.31	$ 0.78	$ 0.17
Diluted net (loss) earnings per common share (in dollars per share)	$ (0.07)	$ 0.31	$ 0.76	$ 0.17
Weighted-average common shares outstanding (in thousands):
Basic (in shares)	33,947	33,884	33,918	33,880
Diluted (in shares)	33,947	33,884	33,918	33,880
Shipping and handling cost
Cost	$ 43.6	$ 54.4	$ 185.9	$ 215.3
Product cost
Cost	$ 180.1	$ 210.5	$ 554.2	$ 580.1

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (2.1)	$ 10.6	$ 27.2	$ 6.4
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.1) in both the three and nine months ended September 30, 2020 and $(0.0) in both the three and nine months ended September 30, 2019.	0.1	0.1	0.5	0.3
Unrealized (loss) gain on cash flow hedges, net of tax of $0.3 and $(0.0) in the three and nine months ended September 30, 2020, respectively, and $(0.1) and $(0.0) in the three and nine months ended September 30, 2019, respectively.	(0.7)	0.3	0.1	0
Cumulative translation adjustment	6.4	(50.7)	(165)	(17.9)
Comprehensive income (loss)	$ 3.7	$ (39.7)	$ (137.2)	$ (11.2)

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Unrealized gain from change in pension obligations, tax	$ (0.1)	$ 0	$ (0.1)	$ 0
Unrealized (loss) gain on cash flow hedges, tax	$ 0.3	$ (0.1)	$ 0	$ 0

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2018	$ 540.2	$ (0.1)	$ 0.4	$ 110.1	$ (2.9)	$ 643.5	$ (0.1)	$ (210.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	22.3					7.6		14.7
Dividends on common stock	(24.5)			0.1		(24.6)
Shares issued for stock units, net of shares withheld for taxes	(0.2)				(0.2)
Stock-based compensation	1.1			1.1
Ending balance at Mar. 31, 2019	538.8		0.4	111.3	(3.1)	626.4		(196.2)
Beginning balance at Dec. 31, 2018	540.2	$ (0.1)	0.4	110.1	(2.9)	643.5	$ (0.1)	(210.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(11.2)
Ending balance at Sep. 30, 2019	459.5		0.4	114.8	(3.2)	576		(228.5)
Beginning balance at Mar. 31, 2019	538.8		0.4	111.3	(3.1)	626.4		(196.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	6.2					(11.8)		18
Dividends on common stock	(24.7)			0.1		(24.8)
Shares issued for stock units, net of shares withheld for taxes	(0.1)				(0.1)
Stock-based compensation	2.7			2.7
Ending balance at Jun. 30, 2019	522.9		0.4	114.1	(3.2)	589.8		(178.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(39.7)					10.6		(50.3)
Dividends on common stock	(24.3)			0.1		(24.4)
Stock-based compensation	0.6			0.6
Ending balance at Sep. 30, 2019	459.5		0.4	114.8	(3.2)	576		(228.5)
Beginning balance at Dec. 31, 2019	529.6		0.4	117.1	(3.2)	607.4		(192.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(145.6)					27.6		(173.2)
Dividends on common stock	(24.8)			0.1		(24.9)
Shares issued for stock units, net of shares withheld for taxes	(0.1)				(0.1)
Stock-based compensation	2.4			2.4
Ending balance at Mar. 31, 2020	361.5		0.4	119.6	(3.3)	610.1		(365.3)
Beginning balance at Dec. 31, 2019	529.6		0.4	117.1	(3.2)	607.4		(192.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(137.2)
Ending balance at Sep. 30, 2020	324.1		0.4	124.5	(4.4)	560.1		(356.5)
Beginning balance at Mar. 31, 2020	361.5		0.4	119.6	(3.3)	610.1		(365.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	4.7					1.7		3
Dividends on common stock	(24.7)			0.1		(24.8)
Shares issued for stock units, net of shares withheld for taxes	(0.6)			(0.1)	(0.5)
Stock-based compensation	2.7			2.7
Ending balance at Jun. 30, 2020	343.6		0.4	122.3	(3.8)	587		(362.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	3.7					(2.1)		5.8
Dividends on common stock	(24.7)			0.1		(24.8)
Shares issued for stock units, net of shares withheld for taxes	(0.6)			(0.1)	(0.5)
Stock options exercised, net of shares withheld for taxes	0			0.1	(0.1)
Stock-based compensation	2.1			2.1
Ending balance at Sep. 30, 2020	$ 324.1		$ 0.4	$ 124.5	$ (4.4)	$ 560.1		$ (356.5)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 0.72	$ 0.72	$ 0.72	$ 0.72	$ 0.72	$ 0.72

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net earnings	$ 27.2	$ 6.4
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation, depletion and amortization	103.6	102.8
Finance fee amortization	2.4	2.1
Early extinguishment of debt	0.1	0
Stock-based compensation	7.2	4
Deferred income taxes	4.9	(10.2)
Net earnings in equity investee	(0.4)	(0.4)
Unrealized foreign exchange (gain) loss	(8.4)	8.5
Other, net	5.6	6.2
Changes in operating assets and liabilities:
Receivables	111	90
Inventories	(96.2)	(75.2)
Other assets	8.6	4.8
Accounts payable and accrued expenses and other current liabilities	21.2	(26.3)
Other liabilities	1.7	(14.8)
Net cash provided by operating activities	188.5	97.9
Cash flows from investing activities:
Capital expenditures	(62.9)	(71.6)
Other, net	(2.3)	(1.6)
Net cash used in investing activities	(65.2)	(73.2)
Cash flows from financing activities:
Proceeds from revolving credit facility borrowings	144.3	288.8
Principal payments on revolving credit facility borrowings	(204.1)	(235.4)
Proceeds from issuance of long-term debt	66.1	58.1
Principal payments on long-term debt	(46.7)	(62.2)
Dividends paid	(74.2)	(73.6)
Deferred financing costs	(1.1)	(0.3)
Shares withheld to satisfy employee tax obligations	(1.2)	(0.3)
Other, net	(1.4)	(0.9)
Net cash used in financing activities	(118.3)	(25.8)
Effect of exchange rate changes on cash and cash equivalents	(5.6)	(2)
Net change in cash and cash equivalents	(0.6)	(3.1)
Cash and cash equivalents, beginning of the year	34.7	27
Cash and cash equivalents, end of period	34.1	23.9
Supplemental cash flow information:
Interest paid, net of amounts capitalized	43.3	47.6
Income taxes paid, net of refunds	$ (18.5)	$ 48.6

Accounting Policies and Basis o

Accounting Policies and Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Accounting Policies and Basis of Presentation	Accounting Policies and Basis of Presentation: Compass Minerals International, Inc. (“CMI”), through its subsidiaries (collectively, the “Company”), is a leading producer of essential minerals that solve nature’s challenges, including salt for winter roadway safety and other consumer, industrial and agricultural uses, specialty plant nutrition minerals that improve the quality and yield of crops, and specialty chemicals for water treatment and other industrial processes. The Company’s principal products are salt, consisting of sodium chloride and magnesium chloride; plant nutrients, consisting of sulfate of potash (“SOP”), secondary nutrients and micronutrients; and specialty chemicals. The Company also provides records management services to businesses located in the United Kingdom (the “U.K.”). The Company’s production sites are located in the United States (“U.S.”), Canada, Brazil and the U.K. Except where otherwise noted, references to North America include only the continental U.S. and Canada, and references to the U.K. include only England, Scotland and Wales. References to “Compass Minerals,” “our,” “us” and “we” refer to CMI and its consolidated subsidiaries. CMI is a holding company with no significant operations other than those of its wholly-owned subsidiaries. The consolidated financial statements include the accounts of CMI and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. The Company uses the equity method of accounting for equity securities when it has significant influence or when it has more than a minor ownership interest or more than minor influence over an investee’s operations but does not have a controlling financial interest. Initial investments are recorded at cost (including certain transaction costs) and are adjusted by the Company’s share of the investees’ undistributed earnings and losses. The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) 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. GAAP for complete financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company for the year ended December 31, 2019, as filed with the Securities and Exchange Commission (“SEC”) in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation, have been included. The Company experiences a substantial amount of seasonality in its sales with respect to its deicing salt products. As a result, sales and operating earnings 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 products are 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 also 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. The Company’s plant nutrition business is also seasonal. For example, the strongest demand for the Company’s plant nutrition products in Brazil typically occurs during the spring planting season. As a result, the Company and its customers generally build inventories during the low demand periods of the year to ensure timely product availability during the peak sales season. The seasonality of this demand results in the Company’s sales volumes and operating income for the Plant Nutrition South America segment usually being the highest during the third and fourth quarters of each year (as the spring planting season begins in September in Brazil). Significant Accounting Policies The Company’s significant accounting policies are detailed in “Note 2 – Summary of Significant Accounting Policies” within Item 8 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued guidance to simplify the accounting for goodwill impairment. The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance remains largely unchanged. The adoption of this guidance on January 1, 2020, did not have an impact on the Company’s consolidated financial statements. On January 1, 2020, the Company adopted guidance issued by the FASB related to credit losses for financial instruments, which replaces the incurred loss methodology with a current expected credit loss methodology (“CECL”). The Company has determined that its receivables are the only financial instrument that is within scope of this CECL guidance. The CECL methodology requires financial assets to be recorded at the net amount expected to be collected over the lifetime of the asset such that the estimated losses are accrued on the day the asset is acquired. The CECL methodology also requires financial assets to be aggregated and evaluated within pools with similar risk characteristics. The Company has recorded an allowance on its receivables based on historical los s rates modified to consider supportable forecasts related to customer-specific and macroeconomic factors. For instance, the Company’s 2020 allowance for doubtful accounts considered the potential impact that the coronavirus pandemic could have on the collectability of its outstanding receivables. The Company’s customer pools are comprised of North American highway deicing customers, North American consumer and industrial customers, Plant Nutrition North America customers, Plant Nutrition South America customers and customers whose outstanding receivable balances have been sent to collections. Customers grouped within these pools have similar risk characteristics. The Company’s allowance for doubtful accounts consists of estimates of expected credit losses and accruals for returns and allowances. At the transition date of January 1, 2020, the implementation of CECL had an immaterial impact of less than $0.1 million on the Company’s consolidated financial statements. Under CECL, the Company had an allowance for doubtful accounts of $9.4 million and $8.2 million as of January 1, 2020, and September 30, 2020, r espectively.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition: Nature of Products and Services The Company’s Salt segment products include salt and magnesium chloride for use in road deicing and dust control, food processing, water softeners, and agricultural and industrial applications. The Company’s plant nutrition products include SOP, secondary nutrients, micronutrients and chemicals for the industrial chemical industry. In the U.K., the Company operates a records management business utilizing excavated areas of the Winsford salt mine with one other location in London, England. Identifying the Contract The Company accounts for a customer contract when there is approval and commitment from both parties, the rights of the parties and payment terms are identified, the contract has commercial substance and collectability of consideration is probable. Identifying the Performance Obligations At contract inception, the Company assesses the goods and services it has promised to its customers and identifies a performance obligation for each promise to transfer to the customer a distinct good or service (or bundle of goods or services). Determining whether products and services are considered distinct performance obligations that should be accounted for separately or aggregated together may require significant judgment. Identifying and Allocating the Transaction Price The Company’s revenues are measured based on consideration specified in the customer contract, net of any sales incentives and amounts collected on behalf of third parties such as sales taxes. In certain cases, the Company’s customer contracts may include promises to transfer multiple products and services to a customer. For multiple-element arrangements, the Company generally allocates the transaction price to each performance obligation in proportion to its stand-alone selling price. When Performance Obligations Are Satisfied The vast majority of the Company’s revenues are recognized at a point in time when the performance obligations are satisfied based upon transfer of control of the product or service to a customer. To determine when the control of goods is transferred, the Company typically assesses, among other things, the shipping terms of the contract, as shipping is an indicator of transfer of control. Some of the Company’s products are sold when the control of the goods transfers to the customer at the time of shipment. There are also instances when the Company provides shipping services to deliver its products. Shipping and handling costs that occur before the customer obtains control of the goods are deemed to be fulfillment activities and are accounted for as fulfillment costs. The Company recognizes shipping and handling costs that are incurred after the customer obtains control of the goods as fulfillment costs which are accrued at the time of revenue recognition. Significant Payment Terms The customer contract states the final terms of the sale, including the description, quantity and price of each product or service purchased. Payment is typically due in full within 30 days of delivery. The Company does not adjust the consideration for the effects of a significant financing component if the Company expects, at contract inception, that the period between when the good or service is transferred to the customer and when the customer pays for that good or service will be one year or less. Refunds, Returns and Warranties The Company’s products are generally not sold with a right of return and the Company does not generally provide credits or incentives, which may be required to be accounted for as variable consideration when estimating the amount of revenue to be recognized. The Company uses historical experience to estimate accruals for refunds due to manufacturing or other defects. See Note 10 for disaggregation of revenue by segment, type and geographical region.

Leases

Leases	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Leases	Leases: In February 2016, the FASB issued guidance which requires lessees to recognize on their balance sheet a right-of-use asset which represents a lessee’s right to use the underlying asset and a lease liability which represents a lessee’s obligation to make lease payments for the right to use the asset. In addition, the guidance requires expanded qualitative and quantitative disclosures. The Company adopted this guidance beginning in the first quarter of 2019, using a modified retrospective transition method, which required the cumulative effect of this change in accounting of $0.1 million to be recorded as an adjustment to beginning retained earnings. The Company elected the package of transition provisions available for existing contracts, which allowed entities to carryforward the historical assessment of whether the contract contained a lease and the lease classification. The Company enters into leases for warehouses and depots, rail cars, vehicles, mobile equipment, office space and certain other types of property and equipment. The Company determines whether an arrangement is or contains a lease at the inception of the contract. The right-of-use asset and lease liability are recognized based on the present value of the future minimum lease payments over the estimated lease term. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company estimates its incremental borrowing rate for each lease based upon the estimated lease term, the type of asset and the location of the leased asset. The most significant judgments in the application of the FASB guidance include whether a contract contains a lease and the lease term. Leases with an initial term of 12 months or less are not recorded on the Company’s Consolidated Balance Sheets. The Company recognizes lease expense for these short-term leases on a straight-line basis over the lease term. Many of the Company’s leases include one or more options to renew and extend the initial lease term. The exercise of lease renewal options is generally at the Company’s discretion. The lease term includes renewal periods in only those instances in which the Company determines it is reasonably assured of renewal. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. In these instances, the assets are depreciated over the useful life of the asset. The Company has elected the practical expedient available under the FASB guidance to not separate lease and nonlease components on all of its lease categories. As a result, many of the Company’s leases include variable payments for services (such as handling or storage) or payments based on the usage of the asset. In addition, certain of the Company’s lease agreements include rental payments that are adjusted periodically for inflation. The Company’s lease agreements do not contain any material residual value guarantees or any material restrictive covenants. The Company’s sublease income is immaterial. The Company’s Consolidated Balance Sheets includes the following (in millions): Consolidated Balance Sheets Location September 30, December 31, Assets Operating leases Other assets $ 56.2 $ 53.7 Finance leases Property, plant and equipment, net 6.8 5.8 Total leased assets $ 63.0 $ 59.5 Liabilities Current liabilities: Operating leases Accrued expenses and other current liabilities $ 13.1 $ 12.8 Finance leases Accrued expenses and other current liabilities 1.3 1.1 Noncurrent liabilities: Operating leases Other noncurrent liabilities 43.8 41.0 Finance leases Other noncurrent liabilities 6.4 6.2 Total lease liabilities $ 64.6 $ 61.1 The Company’s components of lease cost are as follows (in millions): Three Months Ended September 30, Nine Months Ended 2020 2019 2020 2019 Finance lease cost: Amortization of lease assets $ 0.4 $ 0.3 $ 1.3 $ 0.9 Interest on lease liabilities 0.1 0.1 0.4 0.4 Operating lease cost 4.5 4.5 12.6 14.2 Variable lease cost (a) 2.0 3.6 8.9 13.6 Net lease cost $ 7.0 $ 8.5 $ 23.2 $ 29.1 (a) Short-term leases are immaterial and included in variable lease cost. Maturities of lease liabilities are as follows (in millions): September 30, 2020 Operating Leases Finance Leases Total Remainder of 2020 $ 2.7 $ 0.5 $ 3.2 2021 16.0 1.6 17.6 2022 12.0 1.0 13.0 2023 7.7 0.9 8.6 2024 5.6 0.8 6.4 After 2024 22.8 6.4 29.2 Total lease payments 66.8 11.2 78.0 Less: Interest (9.9) (3.5) (13.4) Present value of lease liabilities $ 56.9 $ 7.7 $ 64.6 Supplemental lease term and discount rate information related to leases is as follows: September 30, 2020 December 31, 2019 Weighted-average remaining lease term (years) Operating leases 6.8 7.7 Finance leases 9.4 7.2 Weighted-average discount rate Operating leases 3.9 % 4.3 % Finance leases 7.4 % 7.6 % Supplemental cash flow information related to leases is as follows (in millions): Nine Months Ended 2020 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 12.0 $ 14.2 Operating cash flows from finance leases 0.4 0.4 Financing cash flows from finance leases 1.4 0.9 Leased assets obtained in exchange for new operating lease liabilities 14.0 2.8 Leased assets obtained in exchange for new finance lease liabilities 3.2 0.1
Leases	Leases: In February 2016, the FASB issued guidance which requires lessees to recognize on their balance sheet a right-of-use asset which represents a lessee’s right to use the underlying asset and a lease liability which represents a lessee’s obligation to make lease payments for the right to use the asset. In addition, the guidance requires expanded qualitative and quantitative disclosures. The Company adopted this guidance beginning in the first quarter of 2019, using a modified retrospective transition method, which required the cumulative effect of this change in accounting of $0.1 million to be recorded as an adjustment to beginning retained earnings. The Company elected the package of transition provisions available for existing contracts, which allowed entities to carryforward the historical assessment of whether the contract contained a lease and the lease classification. The Company enters into leases for warehouses and depots, rail cars, vehicles, mobile equipment, office space and certain other types of property and equipment. The Company determines whether an arrangement is or contains a lease at the inception of the contract. The right-of-use asset and lease liability are recognized based on the present value of the future minimum lease payments over the estimated lease term. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company estimates its incremental borrowing rate for each lease based upon the estimated lease term, the type of asset and the location of the leased asset. The most significant judgments in the application of the FASB guidance include whether a contract contains a lease and the lease term. Leases with an initial term of 12 months or less are not recorded on the Company’s Consolidated Balance Sheets. The Company recognizes lease expense for these short-term leases on a straight-line basis over the lease term. Many of the Company’s leases include one or more options to renew and extend the initial lease term. The exercise of lease renewal options is generally at the Company’s discretion. The lease term includes renewal periods in only those instances in which the Company determines it is reasonably assured of renewal. The depreciable life of assets and leasehold improvements are limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. In these instances, the assets are depreciated over the useful life of the asset. The Company has elected the practical expedient available under the FASB guidance to not separate lease and nonlease components on all of its lease categories. As a result, many of the Company’s leases include variable payments for services (such as handling or storage) or payments based on the usage of the asset. In addition, certain of the Company’s lease agreements include rental payments that are adjusted periodically for inflation. The Company’s lease agreements do not contain any material residual value guarantees or any material restrictive covenants. The Company’s sublease income is immaterial. The Company’s Consolidated Balance Sheets includes the following (in millions): Consolidated Balance Sheets Location September 30, December 31, Assets Operating leases Other assets $ 56.2 $ 53.7 Finance leases Property, plant and equipment, net 6.8 5.8 Total leased assets $ 63.0 $ 59.5 Liabilities Current liabilities: Operating leases Accrued expenses and other current liabilities $ 13.1 $ 12.8 Finance leases Accrued expenses and other current liabilities 1.3 1.1 Noncurrent liabilities: Operating leases Other noncurrent liabilities 43.8 41.0 Finance leases Other noncurrent liabilities 6.4 6.2 Total lease liabilities $ 64.6 $ 61.1 The Company’s components of lease cost are as follows (in millions): Three Months Ended September 30, Nine Months Ended 2020 2019 2020 2019 Finance lease cost: Amortization of lease assets $ 0.4 $ 0.3 $ 1.3 $ 0.9 Interest on lease liabilities 0.1 0.1 0.4 0.4 Operating lease cost 4.5 4.5 12.6 14.2 Variable lease cost (a) 2.0 3.6 8.9 13.6 Net lease cost $ 7.0 $ 8.5 $ 23.2 $ 29.1 (a) Short-term leases are immaterial and included in variable lease cost. Maturities of lease liabilities are as follows (in millions): September 30, 2020 Operating Leases Finance Leases Total Remainder of 2020 $ 2.7 $ 0.5 $ 3.2 2021 16.0 1.6 17.6 2022 12.0 1.0 13.0 2023 7.7 0.9 8.6 2024 5.6 0.8 6.4 After 2024 22.8 6.4 29.2 Total lease payments 66.8 11.2 78.0 Less: Interest (9.9) (3.5) (13.4) Present value of lease liabilities $ 56.9 $ 7.7 $ 64.6 Supplemental lease term and discount rate information related to leases is as follows: September 30, 2020 December 31, 2019 Weighted-average remaining lease term (years) Operating leases 6.8 7.7 Finance leases 9.4 7.2 Weighted-average discount rate Operating leases 3.9 % 4.3 % Finance leases 7.4 % 7.6 % Supplemental cash flow information related to leases is as follows (in millions): Nine Months Ended 2020 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 12.0 $ 14.2 Operating cash flows from finance leases 0.4 0.4 Financing cash flows from finance leases 1.4 0.9 Leased assets obtained in exchange for new operating lease liabilities 14.0 2.8 Leased assets obtained in exchange for new finance lease liabilities 3.2 0.1

Inventories

Inventories	9 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories: Inventories consist of the following (in millions): September 30, December 31, Finished goods $ 311.7 $ 235.3 Raw materials and supplies 73.8 76.2 Total inventories $ 385.5 $ 311.5 Based on the nature of our inventories, and specifically related to bulk SOP stockpiles, certain estimates are required to measure the amount of inventories at any point in time. During the third quarter of 2020, the Company identified an error in the valuation of its bulk SOP stockpile inventory at its Ogden facility when one of its stockpiles was largely depleted, which resulted in an estimated overstatement of inventory of approximately $7.4 million. The Company evaluated the error and believes it is not material to any previous period and has therefore recorded this additional expense to product cost within its Plant Nutrition North America segment during the third quarter of 2020.

Property, Plant and Equipment,

Property, Plant and Equipment, Net	9 Months Ended
	Sep. 30, 2020
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, December 31, Land, buildings and structures, and leasehold improvements $ 609.8 $ 596.0 Machinery and equipment 1,023.1 1,001.9 Office furniture and equipment 64.7 60.7 Mineral interests 169.3 171.1 Construction in progress 81.7 141.3 1,948.6 1,971.0 Less accumulated depreciation and depletion (1,003.8) (940.2) Property, plant and equipment, net $ 944.8 $ 1,030.8

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	Goodwill and Intangible Assets, Net: Amounts related to the Company’s amortization of intangible assets are as follows (in millions): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Aggregate amortization expense $ 2.7 $ 3.3 $ 8.7 $ 10.3 Amounts related to the Company’s goodwill are as follows (in millions): September 30, December 31, Goodwill - Plant Nutrition North America Segment $ 53.8 $ 55.4 Goodwill - Plant Nutrition South America Segment 201.0 281.6 Other 5.9 6.0 Total $ 260.7 $ 343.0 The change in goodwill between December 31, 2019 and September 30, 2020 was due to the impact from translating foreign-denominated amounts to U.S. dollars.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
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, mining and withholding taxes, global intangible low-taxed income and interest expense recognition differences for book and tax purposes. The Company had $7.0 million and $18.8 million as of September 30, 2020 and December 31, 2019, respectively, of gross foreign federal net operating loss (“NOL”) carryforwards that have no expiration date, $0.2 million and $1.7 million, respectively, of gross foreign federal NOL carryforwards which expire beginning in 2033 and $0.1 million and $0.3 million, respectively, of net operating tax-effected state NOL carryforwards which expire beginning in 2027. Canadian provincial tax authorities have challenged tax positions claimed by one of the Company’s Canadian subsidiaries and have issued tax reassessments for years 2002-2015. The reassessments are a result of ongoing audits and total $145.0 million, including interest, through September 30, 2020. The Company disputes these reassessments and will 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 has posted collateral in the form of a $95.5 million performance bond and has paid $37.2 million to the Canadian tax authorities (most of which is recorded in other assets in the Consolidated Balance Sheets at September 30, 2020). The Company expects that it will be required by local regulations to provide security for additional interest on the above unresolved 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 disputes are 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, 2020, the Company believes it has adequately reserved for these reassessments. Additionally, the Company has other uncertain tax positions as well as assessments and disputed positions with taxing authorities in its various jurisdictions, which are consistent with those matters disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. Settlements In the fourth quarter of 2017, the Company, the Canadian Revenue Authority (“CRA”) and the U.S. Internal Revenue Service (“IRS”) reached a settlement agreement on transfer pricing issues for the Company’s 2007-2012 tax years. As a result of this settlement agreement, the Company recognized $13.8 million of tax expense in its 2017 Consolidated Statements of Operations related to the Company’s Canadian tax positions for the years 2007-2016. The recording of this settlement resulted in increased sales for the Company’s Canadian subsidiary of $85.7 million and increased offsetting expenses for the Company’s U.S. subsidiary in 2017 causing a domestic loss and significant foreign income. During 2018, in accordance with the settlement agreement, the Company’s U.S. subsidiary made intercompany cash payments of $85.7 million to its Canadian subsidiary and tax payments to Canadian taxing authorities of $17.5 million. The remaining liability was satisfied in 2019 with tax payments of $5.3 million. Corresponding tax refunds of $21.4 million were received primarily in 2019 from U.S. taxing authorities, with the remaining refund of approximately $1.6 million expected in 2020 or early 2021 (recorded in other current assets in the Consolidated Balance Sheets). In the fourth quarter of 2018, the Company, the CRA and the IRS reached a settlement agreement on transfer pricing and management fees as part of an advanced pricing agreement that covers tax years 2013-2021. The tax expense was previously recognized in 2017, however the recording of this settlement resulted in increased sales for the Company’s Canadian subsidiary of $106.1 million and offsetting expenses for the Company’s U.S. subsidiary in 2018 causing a domestic loss and significant foreign income. During 2019, in accordance with the settlement agreement, the Company’s U.S. subsidiary made intercompany cash payments of $106.1 million to its Canadian subsidiary and tax payments to Canadian taxing authorities of $29.9 million, with the remaining $1.5 million of tax payments to be paid during 2020. Corresponding tax refunds of $59.7 million have been received as of September 30, 2020, from U.S. taxing authorities, of which $55.0 million was received during the first quarter of 2020, with the remaining $1.9 million expected in 2020 or early 2021 (recorded in other current assets in its Consolidated Balance Sheets).

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt: Long-term debt consists of the following (in millions): September 30, December 31, 4.875% Senior Notes due July 2024 $ 250.0 $ 250.0 Term Loan due January 2025 392.5 400.0 Revolving Credit Facility due January 2025 100.2 160.0 6.75% Senior Notes due December 2027 500.0 500.0 3.7% Banco Itaú loan due March 2020 — 15.4 AR Securitization Facility expires June 2023 28.0 — Banco Santander loan due October 2020 11.5 16.2 Banco Itaú loan due February 2021 9.9 — Banco Rabobank loan due July 2021 6.2 17.4 Banco BTG loan due July 2021 2.4 — Banco Santander loan due September 2021 — 19.9 Banco do Brasil loan due September 2021 8.9 12.4 Banco Rabobank loan due September 2021 6.2 — Banco BTG loan due October 2021 2.4 — Banco Rabobank loan due November 2021 12.4 17.4 Banco Santander loan due December 2021 10.6 14.9 Banco Votorantim loan due February 2022 7.1 — Banco BTG loan due January 2022 0.9 — Banco Santander loan due March 2022 2.7 — Banco BTG loan due April 2022 0.9 — Banco BTG loan due July 2022 2.3 — Financiadora de Estudos e Projetos loan due November 2023 4.1 7.2 1,359.2 1,430.8 Less unamortized debt issuance costs (13.6) (14.8) Total debt 1,345.6 1,416.0 Less current portion (56.4) (52.1) Long-term debt $ 1,289.2 $ 1,363.9 In the first quarter of 2020, the Company entered into three loans totaling $20.0 million which mature between February 2021 and March 2022, respectively. Two of the loans were denominated in Brazilian reais and one loan was denominated in euros. In connection with the loan denominated in euros, the Company entered into a swap to exchange principal a nd interest payments denominated in euros to Brazilian reais (see Note 12 ). These loans bear interest ranging from 143% - 150% of CDI. During the first quarter of 2020, the Company sold approximately $3.4 million of Brazilian receivables for $3.3 million. The proceeds of the transaction were used to maintain liquidity for working capital needs. The Company is contingently liable for up to 20% of the sale balance up to $0.7 million if the banks are unable to collect on these accounts. During the third quarter of 2020, the Company entered into six new loans totaling $15.1 million which mature between July 2021 and July 2022. These loans are denominated in Brazilian reais and bear interest rates ranging from 200% - 204% of CDI. The liquidity created from these loans allowed the Company to prepay $15.4 million worth of existing loans with maturity date of September 2021. As of September 30, 2020, the term loans and revolving credit facility under the Company’s credit agreement were secured by substantially all existing and future U.S. assets, the Goderich mine in Ontario, Canada and capital stock of certain subsidiaries. The weighted average interest rate of all of the Company’s outstanding debt a s of September 30, 2020, was approximately 5.37%. Securitization On June 30, 2020, certain of the Company’s U.S. subsidiaries entered into a three-year committed revolving accounts receivable financing facility (the “AR Facility”) of up to $100 million with PNC Bank, National Association (“PNC”), as administrative agent and lender, and PNC Capital Markets, LLC, as structuring agent. In connection with the AR Facility, two of the Company’s U.S. subsidiaries, from time to time, sell and contribute receivables and certain related assets to a special purposes entity and wholly-owned U.S. subsidiary of the Company (the “SPE”). The SPE finances its acquisition of the receivables by obtaining secured loans from PNC and the other lenders party to a receivables financing agreement. A U.S. subsidiary of the Company services the receivables on behalf of t he SPE for a fee. In addition, the Company has agreed to guarantee the performance by its subsidiaries. The Company and its subsidiaries do not guarantee the loan principal or interest under the receivables financing agreement or the collectability of the receivables under the AR Facility. As of September 30, 2020, the Company received proceeds from the loan in the amount of $28.0 million. The purchase price for the sale of receivables consists of cash available to the SPE from loans under the AR Facility and from collections on previously sold receivables and, to the extent the SPE does not have funds available to pay the purchase price due on any day in cash, through an increase in the principal amount of a subordinated intercompany loan. The SPE pays monthly interest and fees with respect to amounts advanced by the lenders under the AR Facility. The SPE’s sole business consists of the purchase or acceptance through capital contributions of the receivables and the subsequent granting of a security interest in these receivables and related rights to PNC on behalf of the lenders under the AR Facility. The SPE is a separate legal entity with its own separate creditors who will be entitled, upon its liquidation, to be satisfied out of the SPE’s assets prior to any assets or value in the SPE becoming available to the Company and the assets of the SPE are not available to pay creditors of the Company or any of its affiliates other than the SPE.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: The Wisconsin Department of Agriculture, Trade and Consumer Protection (“DATCP”) and the Wisconsin Department of Natural Resources (“DNR”) have information indicating that agricultural chemicals are present within the subsurface area of the Company’s property located in Kenosha, Wisconsin. The agricultural chemicals were used by previous owners and operators of the site. None of the identified chemicals have been used in association with the Company’s operations since it acquired the property in 2002. DATCP and DNR have directed the Company to conduct further investigations into the environmental conditions at the Kenosha property. The Company continues on-property investigations and has provided the findings to DATCP and DNR as they have become available. All investigations and mitigation activities to date, and any potential future remediation work, are being conducted under the Wisconsin Agricultural Chemical Cleanup Program, which provides for reimbursement of some of the costs. The Company conducts business operations in several countries and is subject to various federal and local labor, social security, environmental and tax laws. While the Company believes it complies with such laws, they are complex and subject to interpretation. In addition to the tax assessments discussed in Note 7 , the Company’s Brazilian subsidiaries are party to administrative tax proceedings and claims which totaled $7.3 million and $15.8 million as of September 30, 2020 and December 31, 2019, respectively, and relate primarily to value added tax, state tax (ICMS) and social security tax (PIS and COFINS) assessments. The Company has assessed the likelihood of a loss at less than probable and therefore, has not established a reserve for these matters. The Company also assumed liabilities for labor-related matters in connection with the 2016 acquisition of Compass Minerals South America, which are primarily related to compensation, labor benefits and consequential tax claims that totaled $3.8 million and $5.6 million as of September 30, 2020 and December 31, 2019, respectively. The Company believes the maximum exposure for these other labor matters totaled approximately $16 million and $25 million as of September 30, 2020 and December 31, 2019, respectively. The Division of Enforcement of the SEC is investigating the Company’s disclosures concerning the operation of the Goderich mine. The Company has cooperated with this investigation and will continue to do so. While it is not possible to predict the timing or the outcome of the SEC inquiry, the Company believes that this matter will not have a material impact on its results of operation, cash flows or financial position. The Company is also involved in legal and administrative proceedings and claims of various types from the ordinary course of the Company’s business.

Operating Segments

Operating Segments	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Operating Segments	Operating Segments: The Company’s reportable segments are strategic business units that offer different products and services, and each business requires different technology and marketing strategies. The Company has three reportable segments: Salt, Plant Nutrition North America and Plant Nutrition South America. The Salt segment produces and markets salt, consisting of sodium chloride and magnesium chloride, for use in road deicing for winter roadway safety and for dust control, food processing, water softeners and other consumer, agricultural and industrial applications. Plant nutrients, including SOP, secondary nutrients and micronutrients are produced and marketed through the Plant Nutrition North America segment. The Plant Nutrition South America segment operates two primary businesses in Brazil – agricultural productivity and chemical solutions. The agricultural productivity division manufactures and distributes a broad offering of specialty plant nutrition solution-based products that are used in direct soil and foliar applications, as well as through irrigation systems and for seed treatment. The chemical solutions division manufactures and markets specialty chemicals for the industrial chemical industry. Segment information is as follows (in millions): Three Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 141.3 $ 35.2 $ 103.3 $ 2.6 $ 282.4 Intersegment sales — 0.3 — (0.3) — Shipping and handling cost 34.4 5.0 4.2 — 43.6 Operating earnings (loss) 25.0 (6.1) 15.0 (16.5) 17.4 Depreciation, depletion and amortization 17.4 10.0 4.4 3.8 35.6 Total assets (as of end of period) 977.1 518.2 557.7 104.8 2,157.8 Three Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 159.6 $ 44.4 $ 135.0 $ 2.3 $ 341.3 Intersegment sales — 1.3 0.1 (1.4) — Shipping and handling cost 43.4 5.8 5.2 — 54.4 Operating earnings (loss) 20.6 4.7 22.4 (17.6) 30.1 Depreciation, depletion and amortization 14.3 11.0 6.0 2.6 33.9 Total assets (as of end of period) 959.2 572.8 683.1 114.7 2,329.8 Nine Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 550.9 $ 150.9 $ 243.0 $ 7.6 $ 952.4 Intersegment sales — 3.0 0.3 (3.3) — Shipping and handling cost 153.9 21.6 10.4 — 185.9 Operating earnings (loss) 111.6 4.2 24.2 (53.9) 86.1 Depreciation, depletion and amortization 49.2 30.7 13.8 9.9 103.6 Nine Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 578.6 $ 129.7 $ 274.8 $ 7.1 $ 990.2 Intersegment sales — 4.4 2.7 (7.1) — Shipping and handling cost 184.7 18.3 12.3 — 215.3 Operating earnings (loss) 87.5 7.7 21.5 (49.3) 67.4 Depreciation, depletion and amortization 44.4 33.5 17.0 7.9 102.8 Disaggregated revenue by product type is as follows (in millions): Three Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 66.6 $ — $ — $ — $ 66.6 Consumer & Industrial Salt 74.7 — — — 74.7 SOP and Specialty Plant Nutrients — 35.5 85.8 — 121.3 Industrial Chemicals — — 17.5 — 17.5 Eliminations & Other — (0.3) — 2.6 2.3 Sales to external customers $ 141.3 $ 35.2 $ 103.3 $ 2.6 $ 282.4 Three Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 84.2 $ — $ — $ — $ 84.2 Consumer & Industrial Salt 75.4 — — — 75.4 SOP and Specialty Plant Nutrients — 45.7 112.2 — 157.9 Industrial Chemicals — — 22.9 — 22.9 Eliminations & Other — (1.3) (0.1) 2.3 0.9 Sales to external customers $ 159.6 $ 44.4 $ 135.0 $ 2.3 $ 341.3 Nine Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 343.3 $ — $ — $ — $ 343.3 Consumer & Industrial Salt 207.6 — — — 207.6 SOP and Specialty Plant Nutrients — 153.9 188.4 — 342.3 Industrial Chemicals — — 54.9 — 54.9 Eliminations & Other — (3.0) (0.3) 7.6 4.3 Sales to external customers $ 550.9 $ 150.9 $ 243.0 $ 7.6 $ 952.4 Nine Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 349.8 $ — $ — $ — $ 349.8 Consumer & Industrial Salt 228.8 — — — 228.8 SOP and Specialty Plant Nutrients — 134.1 210.7 — 344.8 Industrial Chemicals — — 66.8 — 66.8 Eliminations & Other — (4.4) (2.7) 7.1 — Sales to external customers $ 578.6 $ 129.7 $ 274.8 $ 7.1 $ 990.2 (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, legal and finance functions. The Company’s revenue by geographic area is as follows (in millions): Revenue Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 United States (a) $ 128.5 $ 534.1 Canada 33.4 135.0 Brazil 99.9 236.7 United Kingdom 14.3 31.3 Other 6.3 15.3 Total revenue $ 282.4 $ 952.4 Revenue Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 United States (a) $ 159.5 $ 526.1 Canada 34.2 149.5 Brazil 131.7 266.4 United Kingdom 11.0 34.0 Other 4.9 14.2 Total revenue $ 341.3 $ 990.2 (a) United States sales exclude product sold to foreign customers at U.S. ports.

Stockholders' Equity and Equity

Stockholders' Equity and Equity Instruments	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity and Equity Instruments	Stockholders’ Equity and Equity Instruments: In May 2020, the Company’s stockholders approved the 2020 Incentive Award Plan (the “2020 Plan”), which authorizes the issuance of 2,977,933 shares of Company common stock. Since the date the 2020 Plan was approved, the Company ceased issuing equity awards under the 2015 Incentive Award Plan (as amended, the “2015 Plan”). Since the approval of the 2015 Plan in May 2015, the Company ceased issuing equity awards under the 2005 Incentive Award Plan (as amended, the “2005 Plan”). The 2005 Plan, 2015 Plan and 2020 Plan allow for grants of equity awards to executive officers, other employees and directors, including restricted stock units (“RSUs”), performance stock units (“PSUs”), stock options and deferred stock units. Options Most of the stock options granted under the 2005 Plan and 2015 Plan vest ratably, in tranches, over a four-year service period. Unexercised options expire after seven years. Options do not have dividend or voting rights. Upon vesting, each option can be exercised to purchase one share of the Company’s common stock. The exercise price of options is equal to the closing stock price on the grant date. 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 fair value and inputs used to calculate fair value for options granted in the first nine months of 2020 are included in the table below: Fair value of options granted $10.91 Exercise price $58.91 Expected term (years) 4.75 Expected volatility 29.3% Dividend yield 3.5% Risk-free rate of return 1.6% RSUs Typically, the RSUs granted under the 2015 Plan and 2020 Plan vest after one PSUs The PSUs granted under the 2015 Plan are either total shareholder return PSUs (“TSR PSUs”) or return on invested capital PSUs (“ROIC PSUs”). The actual number of shares of the Company’s common stock that may be earned with respect to TSR PSUs is calculated by comparing the Company’s total shareholder return to the total shareholder return for each company comprising the Company’s peer group over the three-year performance period and may range from 0% to 200% of the target number of shares based upon the attainment of these market conditions. The actual number of shares of common stock that may be earned with respect to ROIC PSUs is calculated based on the average of the Company’s annual return on invested capital for each year in the three-year performance period and may range from 0% to 200% of the target number of shares based upon the attainment of these performance conditions. PSUs represent a target number of shares of the Company’s common stock that may be earned before adjustment based upon the attainment of certain conditions. Holders of PSUs do not have voting rights but are entitled to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock for PSUs that are earned, which are paid when the shares underlying the PSUs are issued. 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 Company’s peer group. This model uses historical stock prices to estimate expected volatility and the Company’s correlation to the peer group. The risk-free rate was determined using the same methodology as the option valuations as discussed above. The Company’s closing stock price on the grant date was used to estimate 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 vesting period. During the nine months ended September 30, 2020, the Company reissued the following number of shares from treasury stock: 1,342 shares related to the exercise of stock options , 74,103 shares related to the release of RSUs which veste d, 11,575 shares related to the release of PSUs which ves ted and 9,756 shares related to stock payments. In 2019, the Company issued 32,197 shares from treasury stock. The Company withheld 27,291 shares with a fair value of $1.2 million r elated to the vesting of RSUs and PSUs during the first nine months of 2020. The fair value of the shares were valued at the closing price at the vesting date and represent the employee tax withholding for the employee’s compensation. The Company recognized a tax defici ency of $0.3 million from its equity compensation awards as an increase to income tax expense during the first nine months of 2020. During the first nine months of 2020 and 2019, the Company recorded $7.7 million (includes $0.5 million paid in cash) and $5.1 million (includes $1.1 million paid in cash), 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, 2020: Stock Options RSUs PSUs (a) Number Weighted-average Number Weighted-average Number Weighted-average Outstanding at December 31, 2019 887,867 $ 64.21 217,413 $ 52.07 179,397 $ 61.43 Granted 94,945 58.91 89,906 58.05 69,635 82.38 Exercised (b) (1,342) 55.01 — — (11,575) 78.87 Released from restriction (b) — — (74,103) 49.85 — — Cancelled/expired (89,560) 69.45 (26,079) 51.39 (32,606) 68.24 Outstanding at September 30, 2020 891,910 $ 63.13 207,137 $ 55.55 204,851 $ 66.49 (a) Until the performance period is completed, PSUs are included in the table at the target level at their grant date and at that level represent one share of common stock per PSU. (b) Common stock issued for exercised options and for vested and earned RSUs and PSUs was issued from treasury stock. Other Comprehensive Income (Loss) The Company’s comprehensive income (loss) is comprised of net (loss) earnings, net amortization of the unrealized loss of the pension obligation, the change in the unrealized gain (loss) on natural gas and foreign currency cash flow hedges and foreign currency translation adjustments. The components of and changes in accumulated other comprehensive loss (“AOCL”) as of and for the three and nine months ended September 30, 2020 and 2019, are as follows (in millions): Three Months Ended September 30, 2020 (a) Gains and Defined Foreign Total Beginning balance $ 0.2 $ (6.5) $ (356.0) $ (362.3) Other comprehensive (loss) income before reclassifications (b) (0.5) — 6.4 5.9 Amounts reclassified from accumulated other comprehensive loss (0.2) 0.1 — (0.1) Net current period other comprehensive (loss) income (0.7) 0.1 6.4 5.8 Ending balance $ (0.5) $ (6.4) $ (349.6) $ (356.5) Three Months Ended September 30, 2019 (a) Gains and Defined Foreign Total Beginning balance $ (1.0) $ (4.3) $ (172.9) $ (178.2) Other comprehensive income (loss) before reclassifications (b) 2.0 — (50.7) (48.7) Amounts reclassified from accumulated other comprehensive loss (1.7) 0.1 — (1.6) Net current period other comprehensive income (loss) 0.3 0.1 (50.7) (50.3) Ending balance $ (0.7) $ (4.2) $ (223.6) $ (228.5) Nine Months Ended September 30, 2020 (a) Gains and Defined Foreign Total Beginning balance $ (0.6) $ (6.9) $ (184.6) $ (192.1) Other comprehensive income (loss) before reclassifications (b) 3.1 — (165.0) (161.9) Amounts reclassified from accumulated other comprehensive loss (3.0) 0.5 — (2.5) Net current period other comprehensive income (loss) 0.1 0.5 (165.0) (164.4) Ending balance $ (0.5) $ (6.4) $ (349.6) $ (356.5) Nine Months Ended September 30, 2019 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (0.7) $ (4.5) $ (205.7) $ (210.9) Other comprehensive income (loss) income before reclassifications (b) 1.9 — (17.9) (16.0) Amounts reclassified from accumulated other comprehensive loss (1.9) 0.3 — (1.6) Net current period other comprehensive income (loss) — 0.3 (17.9) (17.6) Ending balance $ (0.7) $ (4.2) $ (223.6) $ (228.5) (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 loss presented in the tables above are reflected net of applicable income taxes. (b) The Company recorded a foreign exchan ge (loss) gain of $(6.9) million and $(96.8) million in the three and nine months ended September 30, 2020 and $25.7 million and $15.3 million in the three and nine months ended September 30, 2019, respectively, in accumulated other comprehensive loss related to intercompany notes which were deemed to be of a long-term investment nature. The amounts reclassified from AOCL to expense (income) for the three and nine months ended September 30, 2020 and 2019, are shown below (in millions): Amount Reclassified from AOCL Three Months Ended Nine Months Ended Line Item Impacted in the Gains (losses) on cash flow hedges: Natural gas instruments $ (0.2) $ (0.8) Product cost Foreign currency contracts — (3.6) Interest expense Income tax benefit — 1.4 Reclassifications, net of income taxes (0.2) (3.0) Amortization of defined benefit pension: Amortization of loss $ 0.2 $ 0.6 Product cost Income tax expense (0.1) (0.1) Reclassifications, net of income taxes 0.1 0.5 Total reclassifications, net of income taxes $ (0.1) $ (2.5) Amount Reclassified from AOCL Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Line Item Impacted in the Consolidated Statements of Operations Gains (losses) on cash flow hedges: Natural gas instruments $ (0.4) $ (0.6) Product cost Foreign currency contracts (2.1) (2.2) Interest expense Income tax benefit 0.8 0.9 Reclassifications, net of income taxes (1.7) (1.9) Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.3 Product cost Reclassifications, net of income taxes 0.1 0.3 Total reclassifications, net of income taxes $ (1.6) $ (1.6)

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2020
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 and foreign currency exchange rate risks by using derivative instruments. From time to time, the Company may enter into immaterial foreign exchange contracts to mitigate foreign exchange risk on its sales and accounts receivable. The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangement. The Company has entered into natural gas derivative instruments and foreign currency derivative instruments with counterparties it views as creditworthy. However, the Company does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with some of these counterparties. The Company records derivative financial instruments as either assets or liabilities at fair value in the Consolidated Balance Sheets. 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. For the qualifying derivative instruments that have been designated as hedges, 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. Any ineffectiveness related to these hedges was not material for any of the periods presented. For derivative instruments that have not been designated as hedges, the entire change in fair value is recorded through earnings in the period of change. Natural Gas Derivative Instruments Natural gas is consumed at several of the Company’s production facilities, and changes in natural gas prices impact the Company’s operating margin. 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, 2020, the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through December 2022. As of September 30, 2020 and December 31, 2019, the Company had agreements in place to hedge forecasted natural gas purchases of 3.1 million a nd 2.8 million MMBtus, respectively. All natural gas derivative instruments held by the Company as of September 30, 2020 and December 31, 2019 qualified and were designated as cash flow hedges. As of September 30, 2020, the Company expects to reclassify from AOCL to earnings during the next twelve month s $0.8 million of net gains on derivative instruments related to its natural gas hedges. Foreign Currency Derivatives Not Designated as Hedges In March 2020, the Company entered into forward instruments to swap currency denominated in U.S. dollars to Canadian dollars for a future intercompany payment from a U.S. subsidiary to a Canadian subsidiary. These instruments matured in April 2020 with combined notional amounts of $89.9 million. The objective of the instruments was to mitigate the foreign currency fluctuation risk related to intercompany payments denominated in a currency other than U.S. dollars, the Company’s functional currency. The instrument was not desi gnated as a hedge. When these agreements settled in April 2020, the Company recognized a foreign exchange loss of $3.1 million in its Consolidated Statements of Operations. From time to time, the Company’s Brazilian subsidiary may enter into forward instruments to swap currency for sales invoices that are denominated in Brazilian reais. These instruments are not material to the Company’s financial statements. Foreign Currency Derivatives Designated as Hedges The Company has entered into euro-denominated debt instruments to provide funds for its operations in Brazil. The Company may also concurrently enter into foreign currency agreements whereby the Company agrees to swap interest and principal payments on loans denominated in euros for principal and interest payments denominated in Brazilian reais, its Brazilian subsidiary’s functional currency. The objective of the swap agreements is to mitigate the foreign currency fluctuation risk related to holding debt denominated in a currency othe r than the Company’s Brazilian subsidiary’s functional currency. As of September 30, 2020, the Company had a swap agreement in place to hedge $10.0 million of a loan denominated in a currency other than its Brazilian subsidiary’s functional currency. Payments on this loan are due on various dates extending through February 2021. As of September 30, 2020, this foreign currency derivative instrument qualified and was designated as a cash flow hedge. As of September 30, 2020, the Company expects to reclassify from AOCL to earnings during the next twelve months $2.8 million of net gai ns on derivative instruments related to this foreign currency swap agreement. The following tables present the fair value of the Company’s hedged items as of September 30, 2020 and December 31, 2019 (in millions): Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location September 30, 2020 Consolidated Balance Sheets Location September 30, 2020 Commodity contracts Other current assets $ 0.9 Accrued expenses and other current liabilities $ 0.1 Commodity contracts Other assets 0.2 Other noncurrent liabilities 0.2 Swap contracts Other current assets 2.8 Accrued expenses and other current liabilities — Total derivatives designated as hedging instruments (a)(b) $ 3.9 $ 0.3 (a) The Company has master netting agreements with both of its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheet s $0.3 million of its co mmodity contracts that are in a payable position against its contracts in receivable positions. (b) The Company has commodity hedge agreements with two counterparties and a foreign currency swap agreement with one counterparty. Amounts recorded as liabilities for the Company’s commodity contracts are payable to both counterparties and amounts recorded as assets for the Company’s foreign currency swap agreements are receivable from one counterparty. Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location December 31, 2019 Consolidated Balance Sheets Location December 31, 2019 Commodity contracts Other current assets $ 0.3 Accrued expenses and other current liabilities $ 0.8 Commodity contracts Other assets 0.1 Other noncurrent liabilities 0.2 Swap contracts Other current assets 2.8 Accrued expenses and other current liabilities — Total derivatives designated as hedging instruments (a)(b) $ 3.2 $ 1.0 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets $0.4 million of its commodity contracts that are in a receivable position against its contracts in payable positions.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements: The Company’s financial instruments are measured and reported at their estimated fair values. Fair value is the price that would be received upon the sale of 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 1 inputs) or, absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (Level 2 inputs). The Company does not have any unobservable inputs that are not corroborated by market inputs (Level 3 inputs). The Company holds marketable securities associated with its defined contribution and pre-tax savings plans, 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 and its risk of changes in foreign currency exchange rates (see Note 12 ). The fair values of the natural gas and foreign currency 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, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.7 $ 1.7 $ — $ — Derivatives – natural gas instruments, net 0.8 — 0.8 — Derivatives – foreign currency contracts, net 2.8 — 2.8 — Total Assets $ 5.3 $ 1.7 $ 3.6 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.7) $ (1.7) $ — $ — Total Liabilities $ (1.7) $ (1.7) $ — $ — (a) Includes mutual fund investments of approximately 30% in common stock of large-cap U.S. companies, 10% in common stock of small to mid-cap U.S. companies, 5% in international companies, 15% in bond funds, 15% in short-term investments and 25% in blended funds. December 31, Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.4 $ 1.4 $ — $ — Derivatives – foreign currency contracts, net 2.8 — 2.8 — Total Assets $ 4.2 $ 1.4 $ 2.8 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.4) $ (1.4) $ — $ — Derivatives – natural gas instruments, net (0.6) — (0.6) — Total Liabilities $ (2.0) $ (1.4) $ (0.6) $ — (a) Includes mutual fund investments of approximately 30% in the common stock of large-cap U.S. companies, 15% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 10% in bond funds, 20% in short-term investments and 20% in blended funds. Cash and cash equivalents, receivables (net of allowance for doubtful accounts) 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 savings plan of $1.7 million and $1.4 million at September 30, 2020 and December 31, 2019, respectively, are stated at fair value based on quoted market prices. As of September 30, 2020 and December 31, 2019, the estimated amount a thir d party would pay for the Company’s fixed-rate 4.875% Senior Notes due July 2024, based on available trading information (Level 2), totaled $256.9 million and $249.1 million, respectively, compared with the aggregate principal amount at maturity of $250.0 million. As of September 30, 2020 and December 31, 2019, the estimated amount a third party would pay for the Company’s fixed-rate 6.75% Senior Notes due December 2027, based on available trading information (Level 2), totaled $540.0 million a nd $530.6 million, respectively, compared with the aggregate principal amount at maturity of $500.0 million. The estimated amount a third party would pay at September 30, 2020 and December 31, 2019 for the amounts outstanding under the Company’s term loans and revolving credit facility, based upon available bid information received from the Co mpany’s lender (Level 2), totaled $486.8 million and $552.8 million, respectively, compared with the aggregate principal balance of $492.7 million and $560.0 million

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2020
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 Nine Months Ended 2020 2019 2020 2019 Numerator: Net (loss) earnings $ (2.1) $ 10.6 $ 27.2 $ 6.4 Less: net earnings allocated to participating securities (a) (0.4) (0.2) (1.3) (0.7) Net (loss) earnings available to common shareholders $ (2.5) $ 10.4 $ 25.9 $ 5.7 Denominator (in thousands): Weighted-average common shares outstanding, shares for basic earnings per share 33,947 33,884 33,918 33,880 Weighted-average awards outstanding (b) — — — — Shares for diluted earnings per share 33,947 33,884 33,918 33,880 Net (loss) earnings per common share, basic $ (0.07) $ 0.31 $ 0.78 $ 0.17 Net (loss) earnings per common share, diluted $ (0.07) $ 0.31 $ 0.76 $ 0.17 (a) Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consis t of 389,000 and 404,000 weighted participating securities for the three and nine months ended September 30, 2020, respectively, and 321,000 and 291,000 weighted participating securities for the three and nine months ended September 30, 2019, respectively. (b) For the calculation of diluted net earnings per share, the Company uses the more dilutive of eithe r the treasury stock method or the two-class method to determine the weighted-average number of outstanding common shares. In addition, the Company had 1,167,000 and 1,228,000 weighted-average equity awards outstanding for the three and nine months ended September 30, 2020, respectively, and 1,194,000 and 1,049,000 weighted-averag

Accounting Policies and Basis_2

Accounting Policies and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Consolidation	CMI is a holding company with no significant operations other than those of its wholly-owned subsidiaries. The consolidated financial statements include the accounts of CMI and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Equity Method Investments	The Company uses the equity method of accounting for equity securities when it has significant influence or when it has more than a minor ownership interest or more than minor influence over an investee’s operations but does not have a controlling financial interest. Initial investments are recorded at cost (including certain transaction costs) and are adjusted by the Company’s share of the investees’ undistributed earnings and losses.
Basis of Presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) 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. GAAP for complete financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company for the year ended December 31, 2019, as filed with the Securities and Exchange Commission (“SEC”) in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring adjustments considered necessary for a fair presentation, have been included.
Significant and Recent Accounting Pronouncements	Significant Accounting Policies The Company’s significant accounting policies are detailed in “Note 2 – Summary of Significant Accounting Policies” within Item 8 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (“FASB”) issued guidance to simplify the accounting for goodwill impairment. The guidance removes Step 2 of the goodwill impairment test, which requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance remains largely unchanged. The adoption of this guidance on January 1, 2020, did not have an impact on the Company’s consolidated financial statements. On January 1, 2020, the Company adopted guidance issued by the FASB related to credit losses for financial instruments, which replaces the incurred loss methodology with a current expected credit loss methodology (“CECL”). The Company has determined that its receivables are the only financial instrument that is within scope of this CECL guidance. The CECL methodology requires financial assets to be recorded at the net amount expected to be collected over the lifetime of the asset such that the estimated losses are accrued on the day the asset is acquired. The CECL methodology also requires financial assets to be aggregated and evaluated within pools with similar risk characteristics. The Company has recorded an allowance on its receivables based on historical los s rates modified to consider supportable forecasts related to customer-specific and macroeconomic factors. For instance, the Company’s 2020 allowance for doubtful accounts considered the potential impact that the coronavirus pandemic could have on the collectability of its outstanding receivables. The Company’s customer pools are comprised of North American highway deicing customers, North American consumer and industrial customers, Plant Nutrition North America customers, Plant Nutrition South America customers and customers whose outstanding receivable balances have been sent to collections. Customers grouped within these pools have similar risk characteristics. The Company’s allowance for doubtful accounts consists of estimates of expected credit losses and accruals for returns and allowances. At the transition date of January 1, 2020, the implementation of CECL had an immaterial impact of less than $0.1 million on the Company’s consolidated financial statements. Under CECL, the Company had an allowance for doubtful accounts of $9.4 million and $8.2 million as of January 1, 2020, and September 30, 2020, r espectively.
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 and foreign currency exchange rate risks by using derivative instruments. From time to time, the Company may enter into immaterial foreign exchange contracts to mitigate foreign exchange risk on its sales and accounts receivable. The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangement. The Company has entered into natural gas derivative instruments and foreign currency derivative instruments with counterparties it views as creditworthy. However, the Company does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with some of these counterparties. The Company records derivative financial instruments as either assets or liabilities at fair value in the Consolidated Balance Sheets. 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. For the qualifying derivative instruments that have been designated as hedges, 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. Any ineffectiveness related to these hedges was not material for any of the periods presented. For derivative instruments that have not been designated as hedges, the entire change in fair value is recorded through earnings in the period of change.
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.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Schedule of Operating and Finance Leases by Balance Sheets Location	The Company’s Consolidated Balance Sheets includes the following (in millions): Consolidated Balance Sheets Location September 30, December 31, Assets Operating leases Other assets $ 56.2 $ 53.7 Finance leases Property, plant and equipment, net 6.8 5.8 Total leased assets $ 63.0 $ 59.5 Liabilities Current liabilities: Operating leases Accrued expenses and other current liabilities $ 13.1 $ 12.8 Finance leases Accrued expenses and other current liabilities 1.3 1.1 Noncurrent liabilities: Operating leases Other noncurrent liabilities 43.8 41.0 Finance leases Other noncurrent liabilities 6.4 6.2 Total lease liabilities $ 64.6 $ 61.1
Schedule of Lease Cost, Lease Terms and Supplemental Cash Flow Information	The Company’s components of lease cost are as follows (in millions): Three Months Ended September 30, Nine Months Ended 2020 2019 2020 2019 Finance lease cost: Amortization of lease assets $ 0.4 $ 0.3 $ 1.3 $ 0.9 Interest on lease liabilities 0.1 0.1 0.4 0.4 Operating lease cost 4.5 4.5 12.6 14.2 Variable lease cost (a) 2.0 3.6 8.9 13.6 Net lease cost $ 7.0 $ 8.5 $ 23.2 $ 29.1 (a) Short-term leases are immaterial and included in variable lease cost. Supplemental lease term and discount rate information related to leases is as follows: September 30, 2020 December 31, 2019 Weighted-average remaining lease term (years) Operating leases 6.8 7.7 Finance leases 9.4 7.2 Weighted-average discount rate Operating leases 3.9 % 4.3 % Finance leases 7.4 % 7.6 % Supplemental cash flow information related to leases is as follows (in millions): Nine Months Ended 2020 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 12.0 $ 14.2 Operating cash flows from finance leases 0.4 0.4 Financing cash flows from finance leases 1.4 0.9 Leased assets obtained in exchange for new operating lease liabilities 14.0 2.8 Leased assets obtained in exchange for new finance lease liabilities 3.2 0.1
Schedule of Operating Lease Maturities	Maturities of lease liabilities are as follows (in millions): September 30, 2020 Operating Leases Finance Leases Total Remainder of 2020 $ 2.7 $ 0.5 $ 3.2 2021 16.0 1.6 17.6 2022 12.0 1.0 13.0 2023 7.7 0.9 8.6 2024 5.6 0.8 6.4 After 2024 22.8 6.4 29.2 Total lease payments 66.8 11.2 78.0 Less: Interest (9.9) (3.5) (13.4) Present value of lease liabilities $ 56.9 $ 7.7 $ 64.6
Schedule of Financing Lease Maturities	Maturities of lease liabilities are as follows (in millions): September 30, 2020 Operating Leases Finance Leases Total Remainder of 2020 $ 2.7 $ 0.5 $ 3.2 2021 16.0 1.6 17.6 2022 12.0 1.0 13.0 2023 7.7 0.9 8.6 2024 5.6 0.8 6.4 After 2024 22.8 6.4 29.2 Total lease payments 66.8 11.2 78.0 Less: Interest (9.9) (3.5) (13.4) Present value of lease liabilities $ 56.9 $ 7.7 $ 64.6

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following (in millions): September 30, December 31, Finished goods $ 311.7 $ 235.3 Raw materials and supplies 73.8 76.2 Total inventories $ 385.5 $ 311.5

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment, Net	Property, plant and equipment, net, consists of the following (in millions): September 30, December 31, Land, buildings and structures, and leasehold improvements $ 609.8 $ 596.0 Machinery and equipment 1,023.1 1,001.9 Office furniture and equipment 64.7 60.7 Mineral interests 169.3 171.1 Construction in progress 81.7 141.3 1,948.6 1,971.0 Less accumulated depreciation and depletion (1,003.8) (940.2) Property, plant and equipment, net $ 944.8 $ 1,030.8

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	Amounts related to the Company’s amortization of intangible assets are as follows (in millions): Three Months Ended Nine Months Ended 2020 2019 2020 2019 Aggregate amortization expense $ 2.7 $ 3.3 $ 8.7 $ 10.3
Summary of Goodwill	Amounts related to the Company’s goodwill are as follows (in millions): September 30, December 31, Goodwill - Plant Nutrition North America Segment $ 53.8 $ 55.4 Goodwill - Plant Nutrition South America Segment 201.0 281.6 Other 5.9 6.0 Total $ 260.7 $ 343.0

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt consists of the following (in millions): September 30, December 31, 4.875% Senior Notes due July 2024 $ 250.0 $ 250.0 Term Loan due January 2025 392.5 400.0 Revolving Credit Facility due January 2025 100.2 160.0 6.75% Senior Notes due December 2027 500.0 500.0 3.7% Banco Itaú loan due March 2020 — 15.4 AR Securitization Facility expires June 2023 28.0 — Banco Santander loan due October 2020 11.5 16.2 Banco Itaú loan due February 2021 9.9 — Banco Rabobank loan due July 2021 6.2 17.4 Banco BTG loan due July 2021 2.4 — Banco Santander loan due September 2021 — 19.9 Banco do Brasil loan due September 2021 8.9 12.4 Banco Rabobank loan due September 2021 6.2 — Banco BTG loan due October 2021 2.4 — Banco Rabobank loan due November 2021 12.4 17.4 Banco Santander loan due December 2021 10.6 14.9 Banco Votorantim loan due February 2022 7.1 — Banco BTG loan due January 2022 0.9 — Banco Santander loan due March 2022 2.7 — Banco BTG loan due April 2022 0.9 — Banco BTG loan due July 2022 2.3 — Financiadora de Estudos e Projetos loan due November 2023 4.1 7.2 1,359.2 1,430.8 Less unamortized debt issuance costs (13.6) (14.8) Total debt 1,345.6 1,416.0 Less current portion (56.4) (52.1) Long-term debt $ 1,289.2 $ 1,363.9

Operating Segments (Tables)

Operating Segments (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Summary of Segment Information	Segment information is as follows (in millions): Three Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 141.3 $ 35.2 $ 103.3 $ 2.6 $ 282.4 Intersegment sales — 0.3 — (0.3) — Shipping and handling cost 34.4 5.0 4.2 — 43.6 Operating earnings (loss) 25.0 (6.1) 15.0 (16.5) 17.4 Depreciation, depletion and amortization 17.4 10.0 4.4 3.8 35.6 Total assets (as of end of period) 977.1 518.2 557.7 104.8 2,157.8 Three Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 159.6 $ 44.4 $ 135.0 $ 2.3 $ 341.3 Intersegment sales — 1.3 0.1 (1.4) — Shipping and handling cost 43.4 5.8 5.2 — 54.4 Operating earnings (loss) 20.6 4.7 22.4 (17.6) 30.1 Depreciation, depletion and amortization 14.3 11.0 6.0 2.6 33.9 Total assets (as of end of period) 959.2 572.8 683.1 114.7 2,329.8 Nine Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 550.9 $ 150.9 $ 243.0 $ 7.6 $ 952.4 Intersegment sales — 3.0 0.3 (3.3) — Shipping and handling cost 153.9 21.6 10.4 — 185.9 Operating earnings (loss) 111.6 4.2 24.2 (53.9) 86.1 Depreciation, depletion and amortization 49.2 30.7 13.8 9.9 103.6 Nine Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Sales to external customers $ 578.6 $ 129.7 $ 274.8 $ 7.1 $ 990.2 Intersegment sales — 4.4 2.7 (7.1) — Shipping and handling cost 184.7 18.3 12.3 — 215.3 Operating earnings (loss) 87.5 7.7 21.5 (49.3) 67.4 Depreciation, depletion and amortization 44.4 33.5 17.0 7.9 102.8
Summary of Disaggregated Revenue by Product Type	Disaggregated revenue by product type is as follows (in millions): Three Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 66.6 $ — $ — $ — $ 66.6 Consumer & Industrial Salt 74.7 — — — 74.7 SOP and Specialty Plant Nutrients — 35.5 85.8 — 121.3 Industrial Chemicals — — 17.5 — 17.5 Eliminations & Other — (0.3) — 2.6 2.3 Sales to external customers $ 141.3 $ 35.2 $ 103.3 $ 2.6 $ 282.4 Three Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 84.2 $ — $ — $ — $ 84.2 Consumer & Industrial Salt 75.4 — — — 75.4 SOP and Specialty Plant Nutrients — 45.7 112.2 — 157.9 Industrial Chemicals — — 22.9 — 22.9 Eliminations & Other — (1.3) (0.1) 2.3 0.9 Sales to external customers $ 159.6 $ 44.4 $ 135.0 $ 2.3 $ 341.3 Nine Months Ended September 30, 2020 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 343.3 $ — $ — $ — $ 343.3 Consumer & Industrial Salt 207.6 — — — 207.6 SOP and Specialty Plant Nutrients — 153.9 188.4 — 342.3 Industrial Chemicals — — 54.9 — 54.9 Eliminations & Other — (3.0) (0.3) 7.6 4.3 Sales to external customers $ 550.9 $ 150.9 $ 243.0 $ 7.6 $ 952.4 Nine Months Ended September 30, 2019 Salt Plant Plant Corporate & Other (a) Total Highway Deicing Salt $ 349.8 $ — $ — $ — $ 349.8 Consumer & Industrial Salt 228.8 — — — 228.8 SOP and Specialty Plant Nutrients — 134.1 210.7 — 344.8 Industrial Chemicals — — 66.8 — 66.8 Eliminations & Other — (4.4) (2.7) 7.1 — Sales to external customers $ 578.6 $ 129.7 $ 274.8 $ 7.1 $ 990.2 (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, legal and finance functions.
Summary of Revenue by Geographic Area	The Company’s revenue by geographic area is as follows (in millions): Revenue Three Months Ended September 30, 2020 Nine Months Ended September 30, 2020 United States (a) $ 128.5 $ 534.1 Canada 33.4 135.0 Brazil 99.9 236.7 United Kingdom 14.3 31.3 Other 6.3 15.3 Total revenue $ 282.4 $ 952.4 Revenue Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 United States (a) $ 159.5 $ 526.1 Canada 34.2 149.5 Brazil 131.7 266.4 United Kingdom 11.0 34.0 Other 4.9 14.2 Total revenue $ 341.3 $ 990.2 (a) United States sales exclude product sold to foreign customers at U.S. ports.

Stockholders' Equity and Equi_2

Stockholders' Equity and Equity Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of Fair Value and Inputs Used to Calculate Fair Value for Options Granted	The fair value and inputs used to calculate fair value for options granted in the first nine months of 2020 are included in the table below: Fair value of options granted $10.91 Exercise price $58.91 Expected term (years) 4.75 Expected volatility 29.3% Dividend yield 3.5% Risk-free rate of return 1.6%
Summary of Stock-Based Compensation Activity	The following table summarizes stock-based compensation activity during the nine months ended September 30, 2020: Stock Options RSUs PSUs (a) Number Weighted-average Number Weighted-average Number Weighted-average Outstanding at December 31, 2019 887,867 $ 64.21 217,413 $ 52.07 179,397 $ 61.43 Granted 94,945 58.91 89,906 58.05 69,635 82.38 Exercised (b) (1,342) 55.01 — — (11,575) 78.87 Released from restriction (b) — — (74,103) 49.85 — — Cancelled/expired (89,560) 69.45 (26,079) 51.39 (32,606) 68.24 Outstanding at September 30, 2020 891,910 $ 63.13 207,137 $ 55.55 204,851 $ 66.49 (a) Until the performance period is completed, PSUs are included in the table at the target level at their grant date and at that level represent one share of common stock per PSU. (b) Common stock issued for exercised options and for vested and earned RSUs and PSUs was issued from treasury stock.
Summary of Components and Changes in Accumulated Other Comprehensive Income (Loss)	The components of and changes in accumulated other comprehensive loss (“AOCL”) as of and for the three and nine months ended September 30, 2020 and 2019, are as follows (in millions): Three Months Ended September 30, 2020 (a) Gains and Defined Foreign Total Beginning balance $ 0.2 $ (6.5) $ (356.0) $ (362.3) Other comprehensive (loss) income before reclassifications (b) (0.5) — 6.4 5.9 Amounts reclassified from accumulated other comprehensive loss (0.2) 0.1 — (0.1) Net current period other comprehensive (loss) income (0.7) 0.1 6.4 5.8 Ending balance $ (0.5) $ (6.4) $ (349.6) $ (356.5) Three Months Ended September 30, 2019 (a) Gains and Defined Foreign Total Beginning balance $ (1.0) $ (4.3) $ (172.9) $ (178.2) Other comprehensive income (loss) before reclassifications (b) 2.0 — (50.7) (48.7) Amounts reclassified from accumulated other comprehensive loss (1.7) 0.1 — (1.6) Net current period other comprehensive income (loss) 0.3 0.1 (50.7) (50.3) Ending balance $ (0.7) $ (4.2) $ (223.6) $ (228.5) Nine Months Ended September 30, 2020 (a) Gains and Defined Foreign Total Beginning balance $ (0.6) $ (6.9) $ (184.6) $ (192.1) Other comprehensive income (loss) before reclassifications (b) 3.1 — (165.0) (161.9) Amounts reclassified from accumulated other comprehensive loss (3.0) 0.5 — (2.5) Net current period other comprehensive income (loss) 0.1 0.5 (165.0) (164.4) Ending balance $ (0.5) $ (6.4) $ (349.6) $ (356.5) Nine Months Ended September 30, 2019 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (0.7) $ (4.5) $ (205.7) $ (210.9) Other comprehensive income (loss) income before reclassifications (b) 1.9 — (17.9) (16.0) Amounts reclassified from accumulated other comprehensive loss (1.9) 0.3 — (1.6) Net current period other comprehensive income (loss) — 0.3 (17.9) (17.6) Ending balance $ (0.7) $ (4.2) $ (223.6) $ (228.5) (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 loss presented in the tables above are reflected net of applicable income taxes. (b) The Company recorded a foreign exchan ge (loss) gain of $(6.9) million and $(96.8) million in the three and nine months ended September 30, 2020 and $25.7 million and $15.3 million in the three and nine months ended September 30, 2019, respectively, in accumulated other comprehensive loss related to intercompany notes which were deemed to be of a long-term investment nature.
Summary of Reclassifications out of Accumulated Other Comprehensive Income	The amounts reclassified from AOCL to expense (income) for the three and nine months ended September 30, 2020 and 2019, are shown below (in millions): Amount Reclassified from AOCL Three Months Ended Nine Months Ended Line Item Impacted in the Gains (losses) on cash flow hedges: Natural gas instruments $ (0.2) $ (0.8) Product cost Foreign currency contracts — (3.6) Interest expense Income tax benefit — 1.4 Reclassifications, net of income taxes (0.2) (3.0) Amortization of defined benefit pension: Amortization of loss $ 0.2 $ 0.6 Product cost Income tax expense (0.1) (0.1) Reclassifications, net of income taxes 0.1 0.5 Total reclassifications, net of income taxes $ (0.1) $ (2.5) Amount Reclassified from AOCL Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Line Item Impacted in the Consolidated Statements of Operations Gains (losses) on cash flow hedges: Natural gas instruments $ (0.4) $ (0.6) Product cost Foreign currency contracts (2.1) (2.2) Interest expense Income tax benefit 0.8 0.9 Reclassifications, net of income taxes (1.7) (1.9) Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.3 Product cost Reclassifications, net of income taxes 0.1 0.3 Total reclassifications, net of income taxes $ (1.6) $ (1.6)

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Fair Value of Hedges	The following tables present the fair value of the Company’s hedged items as of September 30, 2020 and December 31, 2019 (in millions): Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location September 30, 2020 Consolidated Balance Sheets Location September 30, 2020 Commodity contracts Other current assets $ 0.9 Accrued expenses and other current liabilities $ 0.1 Commodity contracts Other assets 0.2 Other noncurrent liabilities 0.2 Swap contracts Other current assets 2.8 Accrued expenses and other current liabilities — Total derivatives designated as hedging instruments (a)(b) $ 3.9 $ 0.3 (a) The Company has master netting agreements with both of its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheet s $0.3 million of its co mmodity contracts that are in a payable position against its contracts in receivable positions. (b) The Company has commodity hedge agreements with two counterparties and a foreign currency swap agreement with one counterparty. Amounts recorded as liabilities for the Company’s commodity contracts are payable to both counterparties and amounts recorded as assets for the Company’s foreign currency swap agreements are receivable from one counterparty. Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location December 31, 2019 Consolidated Balance Sheets Location December 31, 2019 Commodity contracts Other current assets $ 0.3 Accrued expenses and other current liabilities $ 0.8 Commodity contracts Other assets 0.1 Other noncurrent liabilities 0.2 Swap contracts Other current assets 2.8 Accrued expenses and other current liabilities — Total derivatives designated as hedging instruments (a)(b) $ 3.2 $ 1.0 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets $0.4 million of its commodity contracts that are in a receivable position against its contracts in payable positions.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The estimated fair values for each type of instrument are presented below (in millions): September 30, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.7 $ 1.7 $ — $ — Derivatives – natural gas instruments, net 0.8 — 0.8 — Derivatives – foreign currency contracts, net 2.8 — 2.8 — Total Assets $ 5.3 $ 1.7 $ 3.6 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.7) $ (1.7) $ — $ — Total Liabilities $ (1.7) $ (1.7) $ — $ — (a) Includes mutual fund investments of approximately 30% in common stock of large-cap U.S. companies, 10% in common stock of small to mid-cap U.S. companies, 5% in international companies, 15% in bond funds, 15% in short-term investments and 25% in blended funds. December 31, Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.4 $ 1.4 $ — $ — Derivatives – foreign currency contracts, net 2.8 — 2.8 — Total Assets $ 4.2 $ 1.4 $ 2.8 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.4) $ (1.4) $ — $ — Derivatives – natural gas instruments, net (0.6) — (0.6) — Total Liabilities $ (2.0) $ (1.4) $ (0.6) $ — (a) Includes mutual fund investments of approximately 30% in the common stock of large-cap U.S. companies, 15% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 10% in bond funds, 20% in short-term investments and 20% in blended funds.

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Summary 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 Nine Months Ended 2020 2019 2020 2019 Numerator: Net (loss) earnings $ (2.1) $ 10.6 $ 27.2 $ 6.4 Less: net earnings allocated to participating securities (a) (0.4) (0.2) (1.3) (0.7) Net (loss) earnings available to common shareholders $ (2.5) $ 10.4 $ 25.9 $ 5.7 Denominator (in thousands): Weighted-average common shares outstanding, shares for basic earnings per share 33,947 33,884 33,918 33,880 Weighted-average awards outstanding (b) — — — — Shares for diluted earnings per share 33,947 33,884 33,918 33,880 Net (loss) earnings per common share, basic $ (0.07) $ 0.31 $ 0.78 $ 0.17 Net (loss) earnings per common share, diluted $ (0.07) $ 0.31 $ 0.76 $ 0.17 (a) Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consis t of 389,000 and 404,000 weighted participating securities for the three and nine months ended September 30, 2020, respectively, and 321,000 and 291,000 weighted participating securities for the three and nine months ended September 30, 2019, respectively. (b) For the calculation of diluted net earnings per share, the Company uses the more dilutive of eithe r the treasury stock method or the two-class method to determine the weighted-average number of outstanding common shares. In addition, the Company had 1,167,000 and 1,228,000 weighted-average equity awards outstanding for the three and nine months ended September 30, 2020, respectively, and 1,194,000 and 1,049,000 weighted-averag

Accounting Policies and Basis_3

Accounting Policies and Basis of Presentation (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)	$ (324.1)	$ (343.6)	$ (361.5)		$ (529.6)	$ (459.5)	$ (522.9)	$ (538.8)		$ (540.2)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)	(560.1)	$ (587)	$ (610.1)		$ (607.4)	$ (576)	$ (589.8)	$ (626.4)		(643.5)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)										0.1
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)				$ 0.1					$ 0.1	$ 0.1
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for doubtful accounts	$ 8.2			$ 9.4

Revenue Recognition (Details)

Revenue Recognition (Details)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Payment terms for delivery (in years)	30 days

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)	$ (324.1)	$ (343.6)	$ (361.5)		$ (529.6)	$ (459.5)	$ (522.9)	$ (538.8)		$ (540.2)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)	$ (560.1)	$ (587)	$ (610.1)		$ (607.4)	$ (576)	$ (589.8)	$ (626.4)		(643.5)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)										0.1
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative impact of adoption (less than)				$ 0.1					$ 0.1	$ 0.1

Leases - Operating and Finance

Leases - Operating and Finance Leases by Balance Sheets Location (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Operating leases	$ 56.2	$ 53.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Finance leases	$ 6.8	5.8
Total leased assets	$ 63	59.5
Current liabilities:
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Current operating lease liabilities	$ 13.1	12.8
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Current finance lease liabilities	$ 1.3	1.1
Noncurrent liabilities:
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Other noncurrent operating lease liabilities	$ 43.8	41
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Other noncurrent finance lease liabilities	$ 6.4	6.2
Total lease liabilities	$ 64.6	$ 61.1

Leases - Operating and Financ_2

Leases - Operating and Finance Leases by Income Statement Location (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Amortization of lease assets	$ 0.4	$ 0.3	$ 1.3	$ 0.9
Interest on lease liabilities	0.1	0.1	0.4	0.4
Operating lease cost	4.5	4.5	12.6	14.2
Variable lease cost	2	3.6	8.9	13.6
Net lease cost	$ 7	$ 8.5	$ 23.2	$ 29.1

Leases - Schedule of Operating

Leases - Schedule of Operating and Finance Lease Maturities (Details) $ in Millions	Sep. 30, 2020USD ($)
Operating Leases
Remainder of 2020	$ 2.7
2021	16
2022	12
2023	7.7
2024	5.6
After 2024	22.8
Total lease payments	66.8
Less: Interest	(9.9)
Present value of lease liabilities	56.9
Finance Leases
Remainder of 2020	0.5
2021	1.6
2022	1
2023	0.9
2024	0.8
After 2024	6.4
Total lease payments	11.2
Less: Interest	(3.5)
Present value of lease liabilities	7.7
Total
Remainder of 2020	3.2
2021	17.6
2022	13
2023	8.6
2024	6.4
After 2024	29.2
Total lease payments	78
Less: Interest	(13.4)
Present value of lease liabilities	$ 64.6

Leases - Schedule of Lease Term

Leases - Schedule of Lease Terms and Discount Rates (Details)	Sep. 30, 2020	Dec. 31, 2019
Weighted Average Lease Term [Abstract]
Operating leases	6 years 9 months 18 days	7 years 8 months 12 days
Finance leases	9 years 4 months 24 days	7 years 2 months 12 days
Weighted Average Discount Rate [Abstract]
Operating leases (as a percent)	3.90%	4.30%
Finance leases (as a percent)	7.40%	7.60%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 12	$ 14.2
Operating cash flows from finance leases	0.4	0.4
Financing cash flows from finance leases	1.4	0.9
Leased assets obtained in exchange for new operating lease liabilities	14	2.8
Leased assets obtained in exchange for new finance lease liabilities	$ 3.2	$ 0.1

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 311.7	$ 235.3
Raw materials and supplies	73.8	76.2
Total inventories	385.5	$ 311.5
Adjustment to inventory for additional expense	$ 7.4

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property plant and equipment	$ 1,948.6	$ 1,971
Less accumulated depreciation and depletion	(1,003.8)	(940.2)
Property, plant and equipment, net	944.8	1,030.8
Land, buildings and structures, and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property plant and equipment	609.8	596
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property plant and equipment	1,023.1	1,001.9
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Total property plant and equipment	64.7	60.7
Mineral interests
Property, Plant and Equipment [Line Items]
Total property plant and equipment	169.3	171.1
Construction in progress
Property, Plant and Equipment [Line Items]
Total property plant and equipment	$ 81.7	$ 141.3

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill [Line Items]
Aggregate amortization expense	$ 2.7	$ 3.3	$ 8.7	$ 10.3
Goodwill	260.7		260.7		$ 343
Other
Goodwill [Line Items]
Goodwill	5.9		5.9		6
Goodwill - Plant Nutrition North America Segment | Operating Segments
Goodwill [Line Items]
Goodwill	53.8		53.8		55.4
Goodwill - Plant Nutrition South America Segment | Operating Segments
Goodwill [Line Items]
Goodwill	$ 201		$ 201		$ 281.6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Increase to tax expense from settlement			$ 5.3
Sales increase				$ 106.1	$ 85.7
Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Intercompany cash payments for tax settlements				85.7
Tax Year 2013 Through 2021
Income Tax Disclosure [Line Items]
Intercompany cash payments for tax settlements			106.1
Tax refund received	$ 55
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		$ 7	18.8
Foreign Tax Authority | NOL carryforwards expire beginning in 2033
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		0.2	1.7
Foreign Tax Authority | Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Payments for income tax settlements				$ 17.5
Foreign Tax Authority | Tax Year 2013 Through 2021
Income Tax Disclosure [Line Items]
Payments for income tax settlements			29.9
Foreign Tax Authority | Tax Year 2013 Through 2021 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Expected tax payment to be received (paid)						$ 1.5
Foreign Tax Authority | Canadian Tax Authority
Income Tax Disclosure [Line Items]
Total reassessments including interest		145
Amount of security posted in the form of a performance bond		95.5
Amount of security posted in the form of cash		37.2
Foreign Tax Authority | Canadian Tax Authority | Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Increase to tax expense from settlement					$ 13.8
State and Local | NOL carryforwards expire beginning in 2027
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		0.1	0.3
U.S. Federal | Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Tax refund received			$ 21.4
U.S. Federal | Tax Year 2007 Through 2016 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Expected tax payment to be received (paid)						1.6
U.S. Federal | Tax Year 2013 Through 2021
Income Tax Disclosure [Line Items]
Tax refund received		$ 59.7
U.S. Federal | Tax Year 2013 Through 2021 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Expected tax payment to be received (paid)						$ 1.9

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,359.2	$ 1,430.8
Less unamortized debt issuance costs	(13.6)	(14.8)
Total debt	1,345.6	1,416
Less current portion	(56.4)	(52.1)
Long-term debt	1,289.2	1,363.9
Term Loan due January 2025
Debt Instrument [Line Items]
Long-term debt, gross	392.5	400
6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Long-term debt, gross	$ 500	500
Interest rate stated percentage	6.75%
3.7% Banco Itaú loan due March 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	15.4
Interest rate stated percentage	3.70%
AR Securitization Facility expires June 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 28	0
Banco Santander loan due October 2020
Debt Instrument [Line Items]
Long-term debt, gross	11.5	16.2
Banco Itaú loan due February 2021
Debt Instrument [Line Items]
Long-term debt, gross	9.9	0
Banco Rabobank loan due July 2021
Debt Instrument [Line Items]
Long-term debt, gross	6.2	17.4
Banco BTG loan due July 2021
Debt Instrument [Line Items]
Long-term debt, gross	2.4	0
Banco Santander loan due September 2021
Debt Instrument [Line Items]
Long-term debt, gross	0	19.9
Banco do Brasil loan due September 2021
Debt Instrument [Line Items]
Long-term debt, gross	8.9	12.4
Banco Rabobank loan due September 2021
Debt Instrument [Line Items]
Long-term debt, gross	6.2	0
Banco BTG loan due October 2021
Debt Instrument [Line Items]
Long-term debt, gross	2.4	0
Banco Rabobank loan due November 2021
Debt Instrument [Line Items]
Long-term debt, gross	12.4	17.4
Banco Santander loan due December 2021
Debt Instrument [Line Items]
Long-term debt, gross	10.6	14.9
Banco Votorantim loan due February 2022
Debt Instrument [Line Items]
Long-term debt, gross	7.1	0
Banco BTG loan due January 2022
Debt Instrument [Line Items]
Long-term debt, gross	0.9	0
Banco Santander loan due March 2022
Debt Instrument [Line Items]
Long-term debt, gross	2.7	0
Banco BTG loan due April 2022
Debt Instrument [Line Items]
Long-term debt, gross	0.9	0
Banco BTG loan due July 2022
Debt Instrument [Line Items]
Long-term debt, gross	2.3	0
Financiadora de Estudos e Projetos loan due November 2023
Debt Instrument [Line Items]
Long-term debt, gross	4.1	7.2
Revolving Credit Facility due January 2025 | Revolving Credit Facility due January 2025
Debt Instrument [Line Items]
Long-term debt, gross	100.2	160
Senior Notes | 4.875% Senior Notes due July 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 250	$ 250
Interest rate stated percentage	4.875%	4.875%
Senior Notes | 6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Interest rate stated percentage	6.75%

Long-Term Debt - Narrative (Det

Long-Term Debt - Narrative (Details)	Jun. 30, 2020USD ($)	Sep. 30, 2020USD ($)loan	Mar. 31, 2020USD ($)loan	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)
Debt Instrument [Line Items]
Amount of receivables sold			$ 3,400,000
Proceeds from sale of receivable			$ 3,300,000
Amount of receivables liable for (as a percent)			20.00%
Amount of contingently liable receivables			$ 700,000
Repayments of existing loans		$ 15,400,000		$ 46,700,000	$ 62,200,000
Weighted average interest rate of debt (as a percent)		5.37%		5.37%
Unallocated Financing Receivables | Account Receivable Financing Receivable
Debt Instrument [Line Items]
Financing receivable, term	3 years
Revolving accounts receivable financing facility	$ 100,000,000
Proceeds received from loans				$ 28,000,000
Brazilian Reais-denominated Loans
Debt Instrument [Line Items]
Number of debt instruments | loan		6	3
Face amount		$ 15,100,000	$ 20,000,000	$ 15,100,000
Number of loans denominated in foreign currency | loan			2
Euro-Denominated Loans
Debt Instrument [Line Items]
Number of loans denominated in foreign currency | loan			1
Minimum | Brazilian Reais-denominated Loans | Certificado de Deposito Interbancario (CDI)
Debt Instrument [Line Items]
Variable rate, percentage of reference rate		200.00%	143.00%	200.00%
Maximum | Brazilian Reais-denominated Loans | Certificado de Deposito Interbancario (CDI)
Debt Instrument [Line Items]
Variable rate, percentage of reference rate		204.00%	150.00%	204.00%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Maximum exposure for other labor matters	$ 16	$ 25
Compass Minerals South America
Loss Contingencies [Line Items]
Contingent liabilities assumed	3.8	5.6
Brazilian Tax Litigation and Assessments
Loss Contingencies [Line Items]
Amount of potential payments	$ 7.3	$ 15.8

Operating Segments (Details)

Operating Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)segmentBusiness	Sep. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Segment Reporting Information [Abstract]
Sales	$ 282.4	$ 341.3	$ 952.4	$ 990.2
Operating earnings (loss)	17.4	30.1	86.1	67.4
Depreciation, depletion and amortization	35.6	33.9	103.6	102.8
Total assets (as of end of period)	2,157.8	2,329.8	2,157.8	2,329.8	$ 2,443.2
United States
Segment Reporting Information [Abstract]
Sales	128.5	159.5	534.1	526.1
Canada
Segment Reporting Information [Abstract]
Sales	33.4	34.2	135	149.5
Brazil
Segment Reporting Information [Abstract]
Sales	99.9	131.7	236.7	266.4
United Kingdom
Segment Reporting Information [Abstract]
Sales	14.3	11	31.3	34
Other
Segment Reporting Information [Abstract]
Sales	6.3	4.9	15.3	14.2
Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	43.6	54.4	185.9	215.3
Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	66.6	84.2	343.3	349.8
Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	74.7	75.4	207.6	228.8
SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	121.3	157.9	342.3	344.8
Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	17.5	22.9	54.9	66.8
Operating Segments | Salt
Segment Reporting Information [Abstract]
Sales	141.3	159.6	550.9	578.6
Operating earnings (loss)	25	20.6	111.6	87.5
Depreciation, depletion and amortization	17.4	14.3	49.2	44.4
Total assets (as of end of period)	977.1	959.2	977.1	959.2
Operating Segments | Salt | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	34.4	43.4	153.9	184.7
Operating Segments | Salt | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	66.6	84.2	343.3	349.8
Operating Segments | Salt | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	74.7	75.4	207.6	228.8
Operating Segments | Salt | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Salt | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Salt | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Plant Nutrition North America
Segment Reporting Information [Abstract]
Sales	35.2	44.4	150.9	129.7
Operating earnings (loss)	(6.1)	4.7	4.2	7.7
Depreciation, depletion and amortization	10	11	30.7	33.5
Total assets (as of end of period)	518.2	572.8	518.2	572.8
Operating Segments | Plant Nutrition North America | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	5	5.8	21.6	18.3
Operating Segments | Plant Nutrition North America | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Plant Nutrition North America | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Plant Nutrition North America | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	35.5	45.7	153.9	134.1
Operating Segments | Plant Nutrition North America | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Plant Nutrition North America | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	(0.3)	(1.3)	$ (3)	(4.4)
Operating Segments | Plant Nutrition South America
Segment Reporting Information [Line Items]
Number of primary businesses | Business			2
Segment Reporting Information [Abstract]
Sales	103.3	135	$ 243	274.8
Operating earnings (loss)	15	22.4	24.2	21.5
Depreciation, depletion and amortization	4.4	6	13.8	17
Total assets (as of end of period)	557.7	683.1	557.7	683.1
Operating Segments | Plant Nutrition South America | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	4.2	5.2	10.4	12.3
Operating Segments | Plant Nutrition South America | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Plant Nutrition South America | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Operating Segments | Plant Nutrition South America | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	85.8	112.2	188.4	210.7
Operating Segments | Plant Nutrition South America | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	17.5	22.9	54.9	66.8
Operating Segments | Plant Nutrition South America | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	0	(0.1)	(0.3)	(2.7)
Corporate & Other
Segment Reporting Information [Abstract]
Sales	2.6	2.3	7.6	7.1
Operating earnings (loss)	(16.5)	(17.6)	(53.9)	(49.3)
Depreciation, depletion and amortization	3.8	2.6	9.9	7.9
Total assets (as of end of period)	104.8	114.7	104.8	114.7
Corporate & Other | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	0	0	0	0
Corporate & Other | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Corporate & Other | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Corporate & Other | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Corporate & Other | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Corporate & Other | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	2.6	2.3	7.6	7.1
Intersegment Eliminations
Segment Reporting Information [Abstract]
Sales	(0.3)	(1.4)	(3.3)	(7.1)
Intersegment Eliminations | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	2.3	0.9	4.3	0
Intersegment Eliminations | Salt
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Intersegment Eliminations | Plant Nutrition North America
Segment Reporting Information [Abstract]
Sales	0.3	1.3	3	4.4
Intersegment Eliminations | Plant Nutrition South America
Segment Reporting Information [Abstract]
Sales	$ 0	$ 0.1	$ 0.3	$ 2.7

Stockholders' Equity and Equi_3

Stockholders' Equity and Equity Instruments - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock reissued (in shares)	32,197
Tax deficiency from equity compensation awards recorded as an increase to income tax expense		$ 0.3
Compensation expense recorded during period pursuant to stock-based compensation plans		7.7	$ 5.1
Compensation expense to be paid in cash		$ 0.5	$ 1.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Options expiration period		7 years
Number of shares available from conversion (in shares)		1
Reissued shares of treasury stock (in shares)		1,342
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available from conversion (in shares)		1
Reissued shares of treasury stock (in shares)		74,103
TSR PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs		3 years
TSR PSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned		0.00%
TSR PSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned		200.00%
ROIC PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs		3 years
ROIC PSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned		0.00%
ROIC PSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned		200.00%
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued shares of treasury stock (in shares)		11,575
Stock Payments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued shares of treasury stock (in shares)		9,756
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld related to vesting of RSUs and PSUs (in shares)		27,291
Fair value of stock withheld related to vesting of RSUs and PSUs		$ 1.2
2020 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)				2,977,933
2020 Incentive Award Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period		3 years
2015 Incentive Award Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period		1 year

Stockholders' Equity and Equi_4

Stockholders' Equity and Equity Instruments - Schedule of Fair Value and Inputs Used to Calculate Fair Value for Options Granted (Details)	9 Months Ended
	Sep. 30, 2020$ / shares
Equity [Abstract]
Fair value of options granted (in dollars per share)	$ 10.91
Exercise price (in dollars per share)	$ 58.91
Expected term (years)	4 years 9 months
Expected volatility (as a percent)	29.30%
Dividend yield (as a percent)	3.50%
Risk-free rate of return (as a percent)	1.60%

Stockholders' Equity and Equi_5

Stockholders' Equity and Equity Instruments - Stock-Based Compensation Activity (Details)	9 Months Ended
	Sep. 30, 2020$ / sharesshares
Weighted-average exercise price
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	$ 58.91
Stock Options
Number
Outstanding at beginning of period (in shares) | shares	887,867
Granted (in shares) | shares	94,945
Exercised (in shares) | shares	(1,342)
Released from restriction (in shares) | shares	0
Cancelled/expired (in shares) | shares	(89,560)
Outstanding at end of period (in shares) | shares	891,910
Weighted-average exercise price
Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares	$ 64.21
Weighted-average exercise price, granted (in dollars per share) | $ / shares	58.91
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	55.01
Weighted-average exercise price, released from restriction (in dollars per share) | $ / shares	0
Weighted-average exercise price, cancelled/expired (in dollars per share) | $ / shares	69.45
Weighted-average exercise price at end of period (in dollars per share) | $ / shares	$ 63.13
RSUs
Number
Outstanding at beginning of period (in shares) | shares	217,413
Granted (in shares) | shares	89,906
Exercised (in shares) | shares	0
Released from restriction (in shares) | shares	(74,103)
Cancelled/expired (in shares) | shares	(26,079)
Outstanding at end of period (in shares) | shares	207,137
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) | $ / shares	$ 52.07
Weighted-average fair value, granted (in dollars per share) | $ / shares	58.05
Weighted-average fair value, exercised (in dollars per share) | $ / shares	0
Weighted-average fair value, released from restriction (in dollars per share) | $ / shares	49.85
Weighted-average fair value, cancelled/expired (in dollars per share) | $ / shares	51.39
Weighted-average fair value at end of period (in dollars per share) | $ / shares	$ 55.55
PSUs
Number
Outstanding at beginning of period (in shares) | shares	179,397
Granted (in shares) | shares	69,635
Exercised (in shares) | shares	(11,575)
Released from restriction (in shares) | shares	0
Cancelled/expired (in shares) | shares	(32,606)
Outstanding at end of period (in shares) | shares	204,851
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) | $ / shares	$ 61.43
Weighted-average fair value, granted (in dollars per share) | $ / shares	82.38
Weighted-average fair value, exercised (in dollars per share) | $ / shares	78.87
Weighted-average fair value, released from restriction (in dollars per share) | $ / shares	0
Weighted-average fair value, cancelled/expired (in dollars per share) | $ / shares	68.24
Weighted-average fair value at end of period (in dollars per share) | $ / shares	$ 66.49
PSU at grant date (in shares per unit) | shares	1

Stockholders' Equity and Equi_6

Stockholders' Equity and Equity Instruments - Components and Changes In AOCL (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 343.6	$ 522.9	$ 529.6	$ 540.2
Other comprehensive (loss) income before reclassifications	5.9	(48.7)	(161.9)	(16)
Amounts reclassified from accumulated other comprehensive loss	(0.1)	(1.6)	(2.5)	(1.6)
Net current period other comprehensive income (loss)	5.8	(50.3)	(164.4)	(17.6)
Ending balance	324.1	459.5	324.1	459.5
Gains (loss) on foreign exchange of intercompany notes of long-term nature	(6.9)	25.7	(96.8)	15.3
Gains and (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0.2	(1)	(0.6)	(0.7)
Other comprehensive (loss) income before reclassifications	(0.5)	2	3.1	1.9
Amounts reclassified from accumulated other comprehensive loss	(0.2)	(1.7)	(3)	(1.9)
Net current period other comprehensive income (loss)	(0.7)	0.3	0.1	0
Ending balance	(0.5)	(0.7)	(0.5)	(0.7)
Defined Benefit Pension
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(6.5)	(4.3)	(6.9)	(4.5)
Other comprehensive (loss) income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	0.1	0.1	0.5	0.3
Net current period other comprehensive income (loss)	0.1	0.1	0.5	0.3
Ending balance	(6.4)	(4.2)	(6.4)	(4.2)
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(356)	(172.9)	(184.6)	(205.7)
Other comprehensive (loss) income before reclassifications	6.4	(50.7)	(165)	(17.9)
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net current period other comprehensive income (loss)	6.4	(50.7)	(165)	(17.9)
Ending balance	(349.6)	(223.6)	(349.6)	(223.6)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(362.3)	(178.2)	(192.1)	(210.9)
Ending balance	$ (356.5)	$ (228.5)	$ (356.5)	$ (228.5)

Stockholders' Equity and Equi_7

Stockholders' Equity and Equity Instruments - Reclassifications From AOCL (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (17.1)	$ (17.7)	$ (53.3)	$ (50.7)
Income tax benefit (expense)	(1.3)	4.8	11.6	5.3
Net (loss) earnings	(2.1)	10.6	27.2	6.4
Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	(180.1)	(210.5)	(554.2)	(580.1)
Amount Reclassified from AOCL
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net (loss) earnings	(0.1)	(1.6)	(2.5)	(1.6)
Amount Reclassified from AOCL | Gains (losses) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	0	0.8	1.4	0.9
Net (loss) earnings	(0.2)	(1.7)	(3)	(1.9)
Amount Reclassified from AOCL | Amortization of defined benefit pension:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax benefit (expense)	(0.1)		(0.1)
Net (loss) earnings	0.1	0.1	0.5	0.3
Amount Reclassified from AOCL | Amortization of defined benefit pension: | Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.2	0.1	0.6	0.3
Natural gas instruments | Amount Reclassified from AOCL | Gains (losses) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	(0.2)	(0.4)	(0.8)	(0.6)
Foreign currency contracts | Amount Reclassified from AOCL | Gains (losses) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 0	$ (2.1)	$ (3.6)	$ (2.2)

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) MMBTU in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020USD ($)MMBTU	Dec. 31, 2019MMBTU
Natural gas instruments
Derivatives, Fair Value [Line Items]
Notional amount (in MMBtus) | MMBTU	3.1	2.8
Net gains to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months	$ 0.8
Natural gas instruments | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Percent of forecasted usage to be hedged	90.00%
Maximum period which the Company hedges in advance of forecasted purchase	36 months
Foreign currency contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount	$ 89.9
Loss on foreign exchange derivative not designated as hedging instruments	3.1
Swap contracts | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount	10
Gain (loss) expected to be reclassified during the next twelve months	$ 2.8

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Hedged Items (Details) $ in Millions	Sep. 30, 2020USD ($)counterparty	Dec. 31, 2019USD ($)counterparty
Commodity contracts
Derivatives, Fair Value [Line Items]
Netting of contracts in the payable position against contracts in receivable position	$ 0.3
Netting of contracts in a receivable position against contracts in payable position		$ 0.4
Number of counterparties | counterparty	2	2
Swap contracts
Derivatives, Fair Value [Line Items]
Number of counterparties | counterparty	1	2
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 3.9	$ 3.2
Liability Derivatives	0.3	1
Derivatives Designated as Hedging Instruments | Commodity contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.9	0.3
Derivatives Designated as Hedging Instruments | Commodity contracts | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.1	0.8
Derivatives Designated as Hedging Instruments | Commodity contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.2	0.1
Derivatives Designated as Hedging Instruments | Commodity contracts | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.2	0.2
Derivatives Designated as Hedging Instruments | Swap contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2.8	2.8
Derivatives Designated as Hedging Instruments | Swap contracts | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0	$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Estimated Fair Values (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Mutual Fund Investments, Concentration Risk | Common Stock, Large Cap US Companies
Liability Class:
Concentration risk percentage	30.00%	30.00%
Mutual Fund Investments, Concentration Risk | Common Stock of Small to Mid Cap US Companies
Liability Class:
Concentration risk percentage	10.00%	15.00%
Mutual Fund Investments, Concentration Risk | Common Stock, International Companies
Liability Class:
Concentration risk percentage	5.00%	5.00%
Mutual Fund Investments, Concentration Risk | Bond Funds
Liability Class:
Concentration risk percentage	15.00%	10.00%
Mutual Fund Investments, Concentration Risk | Short-Term Investments
Liability Class:
Concentration risk percentage	15.00%	20.00%
Mutual Fund Investments, Concentration Risk | Blended Funds
Liability Class:
Concentration risk percentage	25.00%	20.00%
Fair Value, Measurements, Recurring
Asset Class:
Mutual fund investments in a non-qualified savings plan	$ 1.7	$ 1.4
Total Assets	5.3	4.2
Liability Class:
Liabilities related to non-qualified savings plan	(1.7)	(1.4)
Total Liabilities	(1.7)	(2)
Fair Value, Measurements, Recurring | Natural gas instruments, net
Asset Class:
Derivative assets	0.8
Liability Class:
Derivatives – natural gas instruments, net		(0.6)
Fair Value, Measurements, Recurring | Foreign currency contracts
Asset Class:
Derivative assets	2.8	2.8
Fair Value, Measurements, Recurring | Level One
Asset Class:
Mutual fund investments in a non-qualified savings plan	1.7	1.4
Total Assets	1.7	1.4
Liability Class:
Liabilities related to non-qualified savings plan	(1.7)	(1.4)
Total Liabilities	(1.7)	(1.4)
Fair Value, Measurements, Recurring | Level One | Natural gas instruments, net
Asset Class:
Derivative assets	0
Liability Class:
Derivatives – natural gas instruments, net		0
Fair Value, Measurements, Recurring | Level One | Foreign currency contracts
Asset Class:
Derivative assets	0	0
Fair Value, Measurements, Recurring | Level Two
Asset Class:
Mutual fund investments in a non-qualified savings plan	0	0
Total Assets	3.6	2.8
Liability Class:
Liabilities related to non-qualified savings plan	0	0
Total Liabilities	0	(0.6)
Fair Value, Measurements, Recurring | Level Two | Natural gas instruments, net
Asset Class:
Derivative assets	0.8
Liability Class:
Derivatives – natural gas instruments, net		(0.6)
Fair Value, Measurements, Recurring | Level Two | Foreign currency contracts
Asset Class:
Derivative assets	2.8	2.8
Fair Value, Measurements, Recurring | Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan	0	0
Total Assets	0	0
Liability Class:
Liabilities related to non-qualified savings plan	0	0
Total Liabilities	0	0
Fair Value, Measurements, Recurring | Level Three | Natural gas instruments, net
Asset Class:
Derivative assets	0
Liability Class:
Derivatives – natural gas instruments, net		0
Fair Value, Measurements, Recurring | Level Three | Foreign currency contracts
Asset Class:
Derivative assets	$ 0	$ 0

Fair Value Measurement - Narrat

Fair Value Measurement - Narrative (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Interest rate stated percentage	6.75%
Senior Notes | 4.875% Senior Notes due July 2024
Debt Instrument [Line Items]
Interest rate stated percentage	4.875%	4.875%
Fair value of senior notes	$ 256,900,000	$ 249,100,000
Aggregate principal amount due at maturity	$ 250,000,000	250,000,000
Senior Notes | 6.75% Senior Notes due December 2027
Debt Instrument [Line Items]
Interest rate stated percentage	6.75%
Fair value of senior notes	$ 540,000,000	530,600,000
Senior Notes due 2027
Debt Instrument [Line Items]
Debt fair value amount	500,000,000	500,000,000
Term Loan
Debt Instrument [Line Items]
Aggregate principal amount due at maturity	492,700,000	560,000,000
Fair value of credit agreement debt	486,800,000	552,800,000
Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Mutual fund investments in a non-qualified savings plan	1,700,000	1,400,000
Fair Value, Measurements, Recurring | Level One
Debt Instrument [Line Items]
Mutual fund investments in a non-qualified savings plan	$ 1,700,000	$ 1,400,000

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net (loss) earnings	$ (2.1)	$ 10.6	$ 27.2	$ 6.4
Less: net earnings allocated to participating securities	(0.4)	(0.2)	(1.3)	(0.7)
Net (loss) earnings available to common shareholders	$ (2.5)	$ 10.4	$ 25.9	$ 5.7
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share (in shares)	33,947	33,884	33,918	33,880
Weighted-average awards outstanding (in shares)	0	0	0	0
Shares for diluted earnings per share (in shares)	33,947	33,884	33,918	33,880
Net (loss) earnings per common share, basic (in dollars per share)	$ (0.07)	$ 0.31	$ 0.78	$ 0.17
Net (loss) earnings per common share, diluted (in dollars per share)	$ (0.07)	$ 0.31	$ 0.76	$ 0.17
Participating securities (in shares)	389	321	404	291
Weighted anti-dilutive awards outstanding (in shares)	1,167	1,194	1,228	1,049