Compass Minerals International (CMP) 10-Q 1 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 26, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	COMPASS MINERALS INTERNATIONAL INC
Entity Central Index Key	0001227654
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,881,557
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Entity Emerging Growth Company	false
Entity Small Business	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 43.8	$ 27
Receivables, less allowance for doubtful accounts of $9.9 in 2019 and 2018	241.3	311.6
Inventories	226.1	266.6
Other	108	116
Total current assets	619.2	721.2
Property, plant and equipment, net	1,048.2	1,052
Intangible assets, net	113.2	115.9
Goodwill	350.9	350.8
Investment in equity method investee	24.3	24.5
Other	152.8	103.5
Total assets	2,308.6	2,367.9
Current liabilities:
Current portion of long-term debt	74.2	43.5
Accounts payable	90.5	111.3
Accrued salaries and wages	28.1	31.8
Income taxes payable	21	32.1
Accrued interest	7.5	9.7
Accrued expenses and other current liabilities	64.7	54.9
Total current liabilities	286	283.3
Long-term debt, net of current portion	1,225.6	1,321.2
Deferred income taxes, net	102.6	100.8
Other noncurrent liabilities	155.6	122.4
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	111.3	110.1
Treasury stock, at cost — 1,493,428 shares at March 31, 2019 and 1,513,808 shares at December 31, 2018	(3.1)	(2.9)
Retained earnings	626.4	643.5
Accumulated other comprehensive loss	(196.2)	(210.9)
Total stockholders’ equity	538.8	540.2
Total liabilities and stockholders’ equity	$ 2,308.6	$ 2,367.9

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 9.9	$ 9.9
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)	1,493,428	1,513,808

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales	$ 403.7	$ 437.9
Gross profit	72.6	65.4
Selling, general and administrative expenses	39.4	38.8
Operating earnings	33.2	26.6
Other expense (income):
Interest expense	16.2	13.7
Net loss in equity investee	0.1	0.1
Other, net	4.4	(4.2)
Earnings before income taxes	12.5	17
Income tax expense	4.9	4.4
Net earnings	$ 7.6	$ 12.6
Basic net earnings per common share (in dollars per share)	$ 0.22	$ 0.37
Diluted net earnings per common share (in dollars per share)	$ 0.22	$ 0.37
Weighted-average common shares outstanding (in thousands):
Basic (in shares)	33,874	33,836
Diluted (in shares)	33,874	33,836
Shipping and handling cost
Cost	$ 112.9	$ 120.1
Product cost
Cost	$ 218.2	$ 252.4

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 7.6	$ 12.6
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.0) in both 2019 and 2018	0.1	0.1
Unrealized gain (loss) on cash flow hedges, net of tax of $(0.0) and $0.3 in 2019 and 2018, respectively	0.1	(0.5)
Cumulative translation adjustment	14.5	(14.4)
Comprehensive income (loss)	$ 22.3	$ (2.2)

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized gain from change in pension obligations, tax	$ 0	$ 0
Unrealized gain (loss) on cash flow hedges, tax	$ 0	$ 0.3

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2017	$ 694.6	$ 0.4	$ 102.5	$ (2.9)	$ 672.5	$ (77.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(2.2)				12.6	(14.8)
Stranded tax effect from tax reform	0				0.2	(0.2)
Dividends on common stock ($0.72 per share)	(24.4)		0.1		(24.5)
Stock-based compensation	1.1		1.1
Ending balance at Mar. 31, 2018	669.1	0.4	103.7	(2.9)	660.8	(92.9)
Beginning balance at Dec. 31, 2018	540.2	0.4	110.1	(2.9)	643.5	(210.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	22.3				7.6	14.7
Dividends on common stock ($0.72 per share)	(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)

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 0.72	$ 0.72

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net earnings	$ 7.6	$ 12.6
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation, depletion and amortization	35	34.3
Finance fee amortization	0.7	0.6
Stock-based compensation	1.1	1.1
Deferred income taxes	(0.1)	0.3
Net loss in equity method investee	0.1	0.1
Unrealized foreign exchange loss	0.2	0.2
Other, net	1.4	0.1
Changes in operating assets and liabilities:
Receivables	72	68.9
Inventories	41	71.3
Other assets	17.3	0.5
Accounts payable and accrued expenses and other current liabilities	(46.7)	(17.8)
Other liabilities	(6.1)	0.8
Net cash provided by operating activities	123.5	173
Cash flows from investing activities:
Capital expenditures	(21.5)	(23)
Other, net	(0.3)	(0.6)
Net cash used in investing activities	(21.8)	(23.6)
Cash flows from financing activities:
Proceeds from revolving credit facility borrowings	61.7	63.8
Principal payments on revolving credit facility borrowings	(139.6)	(186.2)
Proceeds from issuance of long-term debt	18.5	16
Principal payments on long-term debt	(5.5)	(5.6)
Dividends paid	(24.6)	(24.5)
Deferred financing costs	0	(0.3)
Shares withheld to satisfy employee tax obligations	(0.2)	0
Other, net	(0.3)	0
Net cash used in financing activities	(90)	(136.8)
Effect of exchange rate changes on cash and cash equivalents	5.1	(4.7)
Net change in cash and cash equivalents	16.8	7.9
Cash and cash equivalents, beginning of the year	27	36.6
Cash and cash equivalents, end of period	43.8	44.5
Supplemental cash flow information:
Interest paid, net of amounts capitalized	17.3	14.7
Income taxes paid, net of refunds	$ 10.2	$ 5

Accounting Policies and Basis o

Accounting Policies and Basis of Presentation	3 Months Ended
	Mar. 31, 2019
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 U.K. The Company’s production sites are located in the United States (“U.S.”), Canada, Brazil and the United Kingdom (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, 2018 , as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring 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 sales 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, 2018. Significant changes to these accounting policies as a result of adopting ASU 2016-02, Leases (Topic 842) , can be found in “ Note 3 – Leases.” Recent Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (the “FASB”) issued guidance to require customers in a cloud computing arrangement that is a service contract to follow the internal use software guidance to determine which implementation costs to capitalize as assets. The capitalized implementation costs related to these arrangements are required to be amortized over the term of the hosting arrangement. The guidance also clarifies the presentation requirements for these costs in an entity’s financial statements. The guidance is effective for periods beginning after December 15, 2019, and interim periods within those fiscal years. The Company is currently assessing the impact this guidance will have on its consolidated financial statements. In January 2017, the 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 guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In June 2016, the FASB issued guidance for estimating credit losses on certain types of financial instruments, including trade receivables, by introducing an approach based on expected losses. The expected loss approach will require entities to incorporate considerations of historical information, current information and reasonable and supportable forecasts. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, requires a modified retrospective transition method and early adoption is permitted. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2019
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	3 Months Ended
	Mar. 31, 2019
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 (“ROU 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 has adopted this guidance beginning in the first quarter of 2019, using a modified retrospective transition method, which requires the cumulative effect of this change in accounting of $0.1 million to be recorded as an adjustment to beginning retained earnings. Prior year consolidated financial statements were not recast under the new guidance and therefore, these amounts are not presented below. 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 ROU 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 such, 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 Three Months Ended Assets Operating lease assets Other assets $ 47.2 Finance lease assets Property, plant and equipment, net 6.6 Total leased assets $ 53.8 Liabilities Current liabilities: Operating Accrued expenses and other current liabilities $ 16.7 Finance Accrued expenses and other current liabilities 1.4 Noncurrent liabilities: Operating Other noncurrent liabilities 30.9 Finance Other noncurrent liabilities 7.0 Total lease liabilities $ 56.0 The Company’s components of lease cost are as follows (in millions): Three Months Ended Finance lease cost: Amortization of lease assets $ 0.3 Interest on lease liabilities 0.2 Operating lease cost 4.8 Variable lease cost (a) 6.1 Net lease cost $ 11.4 (a) Short-term leases are immaterial and included in variable lease cost. Maturities of lease liabilities under the new guidance (“Topic 842”) are as follows (in millions): Topic 842 March 31, 2019 Operating Leases Finance Leases Total 2019 $ 14.4 $ 1.4 $ 15.8 2020 12.4 1.6 14.0 2021 7.0 1.3 8.3 2022 4.5 1.1 5.6 2023 3.7 1.1 4.8 After 2023 14.0 4.5 18.5 Total lease payments 56.0 11.0 67.0 Less: Interest (8.4 ) (2.6 ) (11.0 ) Present value of lease liabilities $ 47.6 $ 8.4 $ 56.0 The Company’s annual aggregate future minimum annual rental payments under the previous guidance (“Topic 840”) as of December 31, 2018 were as follows (in millions): Topic 840 December 31, 2018 Operating Leases Finance Leases Total 2019 $ 16.4 $ 2.3 $ 18.7 2020 10.6 1.8 12.4 2021 5.7 1.3 7.0 2022 4.4 1.1 5.5 2023 3.6 1.1 4.7 After 2023 14.3 4.6 18.9 Total lease payments $ 55.0 $ 12.2 $ 67.2 Supplemental lease term and discount rate information related to leases is as follows (in millions): Three Months Ended Weighted-average remaining lease term (years) Operating leases 6.0 Finance leases 7.6 Weighted-average discount rate Operating leases 4.7 % Finance leases 7.6 % Supplemental cash flow information related to leases is as follows (in millions): Three Months Ended Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 4.9 Operating cash flows from finance leases $ 0.2 Financing cash flows from finance leases $ 0.3 Leased assets obtained in exchange for new operating lease liabilities $ 2.4 Leased assets obtained in exchange for new finance lease liabilities $ —
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 (“ROU 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 has adopted this guidance beginning in the first quarter of 2019, using a modified retrospective transition method, which requires the cumulative effect of this change in accounting of $0.1 million to be recorded as an adjustment to beginning retained earnings. Prior year consolidated financial statements were not recast under the new guidance and therefore, these amounts are not presented below. 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 ROU 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 such, 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 Three Months Ended Assets Operating lease assets Other assets $ 47.2 Finance lease assets Property, plant and equipment, net 6.6 Total leased assets $ 53.8 Liabilities Current liabilities: Operating Accrued expenses and other current liabilities $ 16.7 Finance Accrued expenses and other current liabilities 1.4 Noncurrent liabilities: Operating Other noncurrent liabilities 30.9 Finance Other noncurrent liabilities 7.0 Total lease liabilities $ 56.0 The Company’s components of lease cost are as follows (in millions): Three Months Ended Finance lease cost: Amortization of lease assets $ 0.3 Interest on lease liabilities 0.2 Operating lease cost 4.8 Variable lease cost (a) 6.1 Net lease cost $ 11.4 (a) Short-term leases are immaterial and included in variable lease cost. Maturities of lease liabilities under the new guidance (“Topic 842”) are as follows (in millions): Topic 842 March 31, 2019 Operating Leases Finance Leases Total 2019 $ 14.4 $ 1.4 $ 15.8 2020 12.4 1.6 14.0 2021 7.0 1.3 8.3 2022 4.5 1.1 5.6 2023 3.7 1.1 4.8 After 2023 14.0 4.5 18.5 Total lease payments 56.0 11.0 67.0 Less: Interest (8.4 ) (2.6 ) (11.0 ) Present value of lease liabilities $ 47.6 $ 8.4 $ 56.0 The Company’s annual aggregate future minimum annual rental payments under the previous guidance (“Topic 840”) as of December 31, 2018 were as follows (in millions): Topic 840 December 31, 2018 Operating Leases Finance Leases Total 2019 $ 16.4 $ 2.3 $ 18.7 2020 10.6 1.8 12.4 2021 5.7 1.3 7.0 2022 4.4 1.1 5.5 2023 3.6 1.1 4.7 After 2023 14.3 4.6 18.9 Total lease payments $ 55.0 $ 12.2 $ 67.2 Supplemental lease term and discount rate information related to leases is as follows (in millions): Three Months Ended Weighted-average remaining lease term (years) Operating leases 6.0 Finance leases 7.6 Weighted-average discount rate Operating leases 4.7 % Finance leases 7.6 % Supplemental cash flow information related to leases is as follows (in millions): Three Months Ended Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 4.9 Operating cash flows from finance leases $ 0.2 Financing cash flows from finance leases $ 0.3 Leased assets obtained in exchange for new operating lease liabilities $ 2.4 Leased assets obtained in exchange for new finance lease liabilities $ —

Inventories

Inventories	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	Inventories: Inventories consist of the following (in millions): March 31, December 31, Finished goods $ 159.1 $ 202.2 Raw materials and supplies 67.0 64.4 Total inventories $ 226.1 $ 266.6

Property, Plant and Equipment,

Property, Plant and Equipment, Net	3 Months Ended
	Mar. 31, 2019
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): March 31, December 31, Land, buildings and structures, and leasehold improvements $ 587.5 $ 580.7 Machinery and equipment 996.4 983.2 Office furniture and equipment 56.5 54.4 Mineral interests 169.4 168.1 Construction in progress 123.3 118.3 1,933.1 1,904.7 Less accumulated depreciation and depletion (884.9 ) (852.7 ) Property, plant and equipment, net $ 1,048.2 $ 1,052.0

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	3 Months Ended
	Mar. 31, 2019
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 2019 2018 Aggregate amortization expense $ 3.6 $ 4.1 Amounts related to the Company’s goodwill are as follows (in millions): March 31, December 31, Goodwill - Plant Nutrition North America Segment $ 53.8 $ 52.6 Goodwill - Plant Nutrition South America Segment 291.2 292.3 Other 5.9 5.9 Total $ 350.9 $ 350.8 The change in goodwill between December 31, 2018 and March 31, 2019 was due to the impact from translating foreign-denominated amounts to U.S. dollars.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
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’s effective rate is impacted by permanent tax deductions which have a less favorable impact as pretax income increases. The Company had $31.1 million and $27.2 million as of March 31, 2019 and December 31, 2018 , respectively, of gross foreign federal net operating loss (“NOL”) carryforwards that have no expiration date. In addition, the Company had $1.2 million of gross foreign federal NOL carryforwards as of December 31, 2018 which expire beginning in 2033 and $0.1 million and $0.2 million of net operating tax-effected state NOL carryforwards as of March 31, 2019 and December 31, 2018 , respectively, 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 - 2013 . The reassessments are a result of ongoing audits and total $112.2 million , including interest, through March 31, 2019 . 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 $79.1 million performance bond and has paid $37.0 million to the Canadian tax authorities (most of which is recorded in other assets in its Consolidated Balance Sheets). 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 March 31, 2019 , 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, 2018. 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. 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 . Tax payments of $5.6 million were made during the first quarter of 2019, leaving an outstanding balance of $1.4 million . Corresponding tax refunds of $3.4 million have been received as of March 31, 2019 from U.S. taxing authorities, with the remaining refund of approximately $19.4 million expected later in 2019 (recorded in other current assets in its 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. As a result of this settlement agreement, the Company’s U.S. subsidiary expects to make intercompany cash payments to its Canadian subsidiary of $106.1 million and tax payments to Canadian taxing authorities of approximately $29.6 million during the second quarter of 2019. Corresponding tax refunds of $0.6 million were received during the first quarter of 2019 from U.S. taxing authorities, with the remaining $60.3 million expected to lag the payment to the Canadian tax authorities (recorded in other current assets in its Consolidated Balance Sheets).

Long-term Debt

Long-term Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt: Long-term debt consists of the following (in millions): March 31, December 31, Term Loans due July 2021 $ 826.8 $ 828.9 Revolving Credit Facility due July 2021 119.1 197.0 4.875% Senior Notes due July 2024 250.0 250.0 Banco Rabobank Loan due November 2019 18.0 18.1 Banco Itaú Loans due May 2019 to April 2020 0.5 0.8 Financiadora de Estudos e Projetos Loan due November 2023 8.8 9.3 Banco Santander Loan due September 2019 7.7 — Banco Itaú Loan due March 2019 — 2.5 Banco Scotiabank Loan due September 2019 10.3 10.3 3.7% Banco Itaú loan due March 2020 15.4 15.4 Banco Santander loan due September 2020 20.6 20.6 Banco Santander loan due October 2020 16.7 16.8 Banco Santander loan due July 2019 10.3 — Other 1.7 1.7 1,305.9 1,371.4 Less unamortized debt issuance costs (6.1 ) (6.7 ) Total debt 1,299.8 1,364.7 Less current portion (74.2 ) (43.5 ) Long-term debt $ 1,225.6 $ 1,321.2 In the first quarter of 2018, the Company’s Brazilian subsidiary entered into a new U.S. dollar-denominated loan which matures in March 2020. No material fees were paid in connection with this transaction. The Company also entered into a foreign currency agreement whereby the Company agreed to swap U.S. dollar interest and principal payments on the loan for principal and interest payments denominated in Brazilian reais, the functional currency of the Company’s Brazilian subsidiary (see Note 12 for further discussion). During the third quarter of 2018, the Company paid off approximately $36 million of its Brazilian loans and entered into a new $20.0 million Brazilian loan. The new variable rate loan bears interest of 117.5% of CDI and matures in September 2020. In the third quarter of 2018, the Company sold approximately $9.2 million of receivables for $8.6 million in cash. The proceeds of this transaction were used to refinance the aforementioned Brazilian loans. The Company is contingently liable for up to 20% of the receivables balance if the banks are unable to collect on these accounts. In the fourth quarter of 2018, the Company entered into $18.4 million of loans in Brazil which bear interest at 133.1% of CDI and mature in June 2019 and October 2020. In the first quarter of 2019, the Company entered into two Brazilian reais-denominated loans totaling $18.0 million which mature in July and September of 2019, respectively. The new loans bear interest at 123% and 128% of CDI, respectively. As of March 31, 2019 , 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.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
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 Kenosha, Wisconsin plant. The agricultural chemicals were used by previous owners and operators of the site. None of the identified chemicals have been used in association with 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 plant. 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 $16.0 million and $15.9 million as of March 31, 2019 and December 31, 2018 , 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 Produquímica Indústria e Comércio S.A. (which is now known as Compass Minerals América do Sul Indústria e Comércio S.A.), which are primarily related to compensation, labor benefits and consequential tax claims that totaled $6.6 million and $7.8 million as of March 31, 2019 and December 31, 2018 , respectively. The Company believes the maximum exposure for these other labor matters totaled approximately $29 million and $31 million as of March 31, 2019 and December 31, 2018 , respectively. The Company is also involved in legal and administrative proceedings and claims of various types from the ordinary course of the Company’s business. Management cannot predict the outcome of legal claims and proceedings with certainty. Nevertheless, management believes that the outcome of legal proceedings and claims, which are pending or known to be threatened, even if determined adversely, will not, individually or in the aggregate, have a material adverse effect on the Company’s results of operations, cash flows or financial position.

Operating Segments

Operating Segments	3 Months Ended
	Mar. 31, 2019
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, micronutrients and magnesium chloride for agricultural purposes 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 March 31, 2019 Salt Plant Plant Corporate (a) Total Sales to external customers $ 306.4 $ 37.2 $ 57.7 $ 2.4 $ 403.7 Intersegment sales — 0.5 1.5 (2.0 ) — Shipping and handling cost 103.7 6.0 3.2 — 112.9 Operating earnings (loss) 52.3 (1.6 ) (2.6 ) (14.9 ) 33.2 Depreciation, depletion and amortization 15.3 11.6 5.6 2.5 35.0 Total assets (as of end of period) 889.7 594.1 710.6 114.2 2,308.6 Three Months Ended March 31, 2018 Salt Plant Plant Corporate (a) Total Sales to external customers $ 315.9 $ 52.9 $ 66.3 $ 2.8 $ 437.9 Intersegment sales — 0.2 0.4 (0.6 ) — Shipping and handling cost 109.5 6.4 4.2 — 120.1 Operating earnings (loss) 34.1 4.9 0.8 (13.2 ) 26.6 Depreciation, depletion and amortization 14.7 11.3 5.9 2.4 34.3 Total assets (as of end of period) 885.7 580.0 816.8 130.3 2,412.8 Disaggregated revenue by product type is as follows (in millions): Three Months Ended March 31, 2019 Salt Plant Plant Corporate (a) Total Highway Deicing Salt $ 218.7 $ — $ — $ — $ 218.7 Consumer & Industrial Salt 87.7 — — — 87.7 SOP and Specialty Plant Nutrients — 37.7 36.6 — 74.3 Industrial Chemicals — — 22.6 — 22.6 Eliminations & Other — (0.5 ) (1.5 ) 2.4 0.4 Sales to external customers $ 306.4 $ 37.2 $ 57.7 $ 2.4 $ 403.7 Three Months Ended March 31, 2018 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Highway Deicing Salt $ 235.4 $ — $ — $ — $ 235.4 Consumer & Industrial Salt 80.5 — — — 80.5 SOP and Specialty Plant Nutrients — 53.1 39.9 — 93.0 Industrial Chemicals — — 26.8 — 26.8 Eliminations & Other — (0.2 ) (0.4 ) 2.8 2.2 Sales to external customers $ 315.9 $ 52.9 $ 66.3 $ 2.8 $ 437.9 (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 Three Months Ended United States (a) $ 238.3 $ 242.2 Canada 87.4 90.8 Brazil 55.7 65.6 United Kingdom 17.3 36.7 Other 5.0 2.6 Total Revenue $ 403.7 $ 437.9 (a) United States sales exclude product sold to foreign customers at U.S. ports.

Stockholders' Equity and Equity

Stockholders' Equity and Equity Instruments	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Stockholders' Equity and Equity Instruments	Stockholders’ Equity and Equity Instruments: In May 2015, the Company’s stockholders approved the 2015 Incentive Award Plan (as amended, the “2015 Plan”), which authorizes the issuance of 3,000,000 shares of Company common stock. Since the date the 2015 Plan was approved, the Company ceased issuing equity awards under the 2005 Incentive Award Plan (as amended, the “2005 Plan”). The 2005 Plan and 2015 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. The grants occur following approval by the compensation committee of the Company’s board of directors, with the amount and terms communicated to employees shortly thereafter. Options Substantially all 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. RSUs Typically, the RSUs granted under the 2015 Plan vest after three years of service. RSUs entitle the holders to one share of common stock for each vested RSU. Unvested RSUs do not have voting rights but are entitled to receive non-forfeitable dividends (generally after a performance hurdle has been satisfied for the year of the grant) or other distributions equal to those declared on the Company’s common stock for RSUs that are earned as a result of the satisfaction of the performance hurdle. The closing stock price on the grant date is used to determine the fair value of RSUs. 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 Russell 3000 Index (for TSR PSUs granted in 2017 and earlier) or the Company’s peer group (for TSR PSUs granted in 2018 and later) over the three -year performance period and may range from 0% to 150% 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 paid. To estimate the fair value of the TSR PSUs on the grant date, the Company uses a Monte-Carlo simulation model , which simulates future stock prices of the Company as well as the companies comprising the Russell 3000 Index or the Company’s peer group depending on the year granted. This model uses historical stock prices to estimate expected volatility and the Company’s correlation to the Russell 3000 Index or 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 three months ended March 31, 2019 , the Company reissued the following number of shares from treasury stock: no shares related to the exercise of stock options, 22,358 shares related to the release of RSUs which vested, no shares related to the release of PSUs which vested and 4,759 shares related to stock payments. In 2018, the Company issued 25,955 shares from treasury stock. The Company withheld 6,737 shares with a fair value of $0.2 million related to the vesting of RSUs during the first quarter of 2019. 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 deficiency of $0.2 million from its equity compensation awards as an increase to income tax expense during the first three months of 2019 . During the first three months of 2019 and 2018 , the Company recorded $1.1 million 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 three months ended March 31, 2019 : Stock Options RSUs PSUs (a) Number Weighted-average exercise price Number Weighted-average fair value Number Weighted-average fair value Outstanding at December 31, 2018 708,746 $ 70.76 83,308 $ 65.75 126,638 $ 69.06 Granted — — 64,350 41.90 — — Exercised (b) — — — — — — Released from restriction (b) — — (22,358 ) 65.33 — — Cancelled/expired (51,230 ) 74.46 (1,281 ) 64.98 (15,375 ) 70.31 Outstanding at March 31, 2019 657,516 $ 70.47 124,019 $ 53.46 111,263 $ 68.89 (a) Until they vest, 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 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 months ended March 31, 2019 and 2018 , are as follows (in millions): Three Months Ended March 31, 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 before reclassifications (b) 0.2 — 14.5 14.7 Amounts reclassified from accumulated other comprehensive loss (0.1 ) 0.1 — — Net current period other comprehensive income 0.1 0.1 14.5 14.7 Ending balance $ (0.6 ) $ (4.4 ) $ (191.2 ) $ (196.2 ) Three Months Ended March 31, 2018 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (0.9 ) $ (3.9 ) $ (73.1 ) $ (77.9 ) Other comprehensive loss before reclassifications (b) (0.2 ) — (14.4 ) (14.6 ) Amounts reclassified from accumulated other comprehensive loss (0.3 ) 0.1 — (0.2 ) Net current period other comprehensive (loss) income (0.5 ) 0.1 (14.4 ) (14.8 ) Reclassification of stranded tax out of AOCL to retained earnings (c) (0.2 ) — — (0.2 ) Ending balance $ (1.6 ) $ (3.8 ) $ (87.5 ) $ (92.9 ) (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 income (loss) presented in the tables above are reflected net of applicable income taxes. (b) The Company recorded foreign exchange gains (losses) of $2.3 million and $(4.4) million in the three months ended March 31, 2019 and 2018 , respectively, in accumulated other comprehensive loss related to intercompany notes which were deemed to be of a long-term investment nature. (c) In the first quarter of 2018, the Company adopted guidance which allows entities to reclassify tax effects of the change in U.S. income tax rates from accumulated other comprehensive loss to retained earnings. The amounts reclassified from AOCL to expense for the three months ended March 31, 2019 and 2018 , are shown below (in millions): Amount Reclassified from AOCL Three Months Ended Three Months Ended Line Item Impacted in the Consolidated Statements of Operations Gains and (losses) on cash flow hedges: Natural gas instruments $ (0.1 ) $ — Product cost Foreign currency contracts (0.1 ) (0.5 ) Interest expense Income tax expense 0.1 0.2 Reclassifications, net of income taxes (0.1 ) (0.3 ) Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.1 Product cost Income tax expense — — Reclassifications, net of income taxes 0.1 0.1 Total reclassifications, net of income taxes $ — $ (0.2 )

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2019
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. 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 March 31, 2019 , the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through December 2021 . As of March 31, 2019 and December 31, 2018 , the Company had agreements in place to hedge forecasted natural gas purchases of 1.6 million and 1.0 million MMBtus, respectively. All natural gas derivative instruments held by the Company as of March 31, 2019 and December 31, 2018 qualified and were designated as cash flow hedges. As of March 31, 2019 , the Company expects to reclassify from accumulated other comprehensive loss to earnings during the next twelve months $0.4 million of net losses on derivative instruments related to its natural gas hedges. Foreign Currency Derivatives Not Designated as Hedges In February 2018, the Company entered into a forward instrument to swap currency denominated in Brazilian reais to Canadian dollars for the amounts borrowed under an intercompany note. The instrument matured in November 2018 and was for a notional amount of approximately $19.9 million U.S. dollars. The objective of the instrument was to mitigate the foreign currency fluctuation risk related to holding debt denominated in a currency other than its Brazil subsidiary’s functional currency. The instrument was not designated as a hedge. During the three months ended March 31, 2018, the Company recognized a net gain of $0.3 million in other expense in its Consolidated Statements of Operations for this agreement. In the latter half of 2018, the Company entered into non-deliverable forward contracts to fix $11.9 million of its net position in accounts receivable and accounts payable in Brazil that were U.S. dollar denominated. The objective of these instruments was to mitigate the foreign currency fluctuation risk related to the Company’s accounts receivable and payable denominated in a currency other than its Brazil subsidiary’s functional currency. These forward contracts were not designated as hedges. These forward contracts matured in December 2018. Foreign Currency Derivatives Designated as Hedges The Company has entered into U.S. dollar-denominated debt instruments to provide funds for its operations in Brazil (see Note 8 for more information). The Company may also concurrently enter into foreign currency agreements whereby the Company agrees to swap interest and principal payments on loans denominated in U.S. dollars for principal and interest payments denominated in Brazilian reais, its Brazil 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 other than the Company’s Brazil subsidiary’s functional currency. As of March 31, 2019, the Company had swap agreements in place to hedge $26.2 million of loans denominated in currencies other than its Brazil subsidiary’s functional currency. Payments on these loans are due on various dates extending through March 2020. As of March 31, 2019, these foreign currency derivative instruments qualified and were designated as cash flow hedges. As of March 31, 2019 , the Company expects to reclassify from accumulated other comprehensive loss to earnings during the next twelve months $1.9 million of net gains on derivative instruments related to these foreign currency swap agreements. The following tables present the fair value of the Company’s hedged items as of March 31, 2019 and December 31, 2018 (in millions): Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location March 31, 2019 Consolidated Balance Sheets Location March 31, 2019 Commodity contracts Other current assets $ — Accrued expenses and other current liabilities $ 0.4 Commodity contracts Other assets — Other noncurrent liabilities 0.1 Swap contracts Other current assets 1.9 Accrued expenses and other current liabilities — Swap contracts Other assets 2.6 Other noncurrent liabilities — Total derivatives designated as hedging instruments (a) (b) $ 4.5 $ 0.5 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets an immaterial amount receivable from both counterparties. (b) The Company has both commodity hedge and foreign currency swap agreements with two counterparties each. 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 both counterparties. Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location December 31, 2018 Consolidated Balance Sheets Location December 31, 2018 Commodity contracts Other current assets $ — Accrued expenses and other current liabilities $ 0.6 Swap contracts Other current assets 2.2 Accrued expenses and other current liabilities — Swap contracts Other assets 2.3 Other noncurrent liabilities — Total derivatives designated as hedging instruments (a)(b) $ 4.5 $ 0.6 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets less than $0.1 million of its commodity contracts that are in a receivable position against its contracts in payable positions. (b) The Company has both commodity hedge and foreign currency swap agreements with two counterparties each. 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 both counterparties.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2019
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): March 31, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.9 $ 1.9 $ — $ — Derivatives – foreign currency contracts, net 4.5 — 4.5 — Total Assets $ 6.4 $ 1.9 $ 4.5 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.9 ) $ (1.9 ) $ — $ — Derivatives – natural gas instruments, net (0.5 ) — (0.5 ) — Total Liabilities $ (2.4 ) $ (1.9 ) $ (0.5 ) $ — (a) Includes mutual fund investments of approximately 25% in common stock of large-cap U.S. companies, 15% 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, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.8 $ 1.8 $ — $ — Derivatives – foreign currency contracts, net 4.5 — 4.5 — Total Assets $ 6.3 $ 1.8 $ 4.5 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.8 ) $ (1.8 ) $ — $ — Derivatives – natural gas instruments, net (0.6 ) — (0.6 ) — Total Liabilities $ (2.4 ) $ (1.8 ) $ (0.6 ) $ — (a) Includes mutual fund investments of approximately 25% 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, 20% in bond funds, 15% in short-term investments and 20% in blended funds. Cash and cash equivalents, accounts receivable (net of allowance for bad debts) and payables are carried at cost, which approximates fair value due to their liquid and short-term nature. The Company’s investments related to its nonqualified savings plan of $1.9 million and $1.8 million at March 31, 2019 and December 31, 2018 , respectively, are stated at fair value based on quoted market prices. As of March 31, 2019 and December 31, 2018 , the estimated amount a third party would pay for the Company’s fixed-rate 4.875% Senior Notes due July 2024, based on available trading information (Level 2), totaled $233.8 million and $226.3 million , respectively, compared with the aggregate principal amount at maturity of $250.0 million . The estimated amount a third party would pay at March 31, 2019 and December 31, 2018 for the amounts outstanding under the Company’s term loans and revolving credit facility, based upon available bid information received from the Company’s lender (Level 2), totaled $939.4 million and $1.02 billion , respectively, compared with the aggregate principal balance of $945.9 million and $1.03 billion , respectively. The Brazilian loans have floating rates and their fair value approximates their carrying value.

Earnings per Share

Earnings per Share	3 Months Ended
	Mar. 31, 2019
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 2019 2018 Numerator: Net earnings $ 7.6 $ 12.6 Less: net earnings allocated to participating securities (a) (0.2 ) (0.1 ) Net earnings available to common shareholders $ 7.4 $ 12.5 Denominator (in thousands): Weighted-average common shares outstanding, shares for basic earnings per share 33,874 33,836 Weighted-average awards outstanding (b) — — Shares for diluted earnings per share 33,874 33,836 Net earnings per common share, basic $ 0.22 $ 0.37 Net earnings per common share, diluted $ 0.22 $ 0.37 (a) Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consist of 233,000 and 163,000 weighted participating securities for the three months ended March 31, 2019 and 2018, respectively. (b) For the calculation of diluted earnings per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted-average number of outstanding common shares. In addition, the Company had 788,000 and 618,000 weighted-average equity awards outstanding for the three months ended March 31, 2019 and 2018, respectively.

Accounting Policies and Basis_2

Accounting Policies and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
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, 2018 , as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring 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, 2018. Significant changes to these accounting policies as a result of adopting ASU 2016-02, Leases (Topic 842) , can be found in “ Note 3 – Leases.” Recent Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (the “FASB”) issued guidance to require customers in a cloud computing arrangement that is a service contract to follow the internal use software guidance to determine which implementation costs to capitalize as assets. The capitalized implementation costs related to these arrangements are required to be amortized over the term of the hosting arrangement. The guidance also clarifies the presentation requirements for these costs in an entity’s financial statements. The guidance is effective for periods beginning after December 15, 2019, and interim periods within those fiscal years. The Company is currently assessing the impact this guidance will have on its consolidated financial statements. In January 2017, the 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 guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements. In June 2016, the FASB issued guidance for estimating credit losses on certain types of financial instruments, including trade receivables, by introducing an approach based on expected losses. The expected loss approach will require entities to incorporate considerations of historical information, current information and reasonable and supportable forecasts. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, requires a modified retrospective transition method and early adoption is permitted. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements.
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. 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)	3 Months Ended
	Mar. 31, 2019
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 Three Months Ended Assets Operating lease assets Other assets $ 47.2 Finance lease assets Property, plant and equipment, net 6.6 Total leased assets $ 53.8 Liabilities Current liabilities: Operating Accrued expenses and other current liabilities $ 16.7 Finance Accrued expenses and other current liabilities 1.4 Noncurrent liabilities: Operating Other noncurrent liabilities 30.9 Finance Other noncurrent liabilities 7.0 Total lease liabilities $ 56.0
Schedule of Operating Lease Maturities	Maturities of lease liabilities under the new guidance (“Topic 842”) are as follows (in millions): Topic 842 March 31, 2019 Operating Leases Finance Leases Total 2019 $ 14.4 $ 1.4 $ 15.8 2020 12.4 1.6 14.0 2021 7.0 1.3 8.3 2022 4.5 1.1 5.6 2023 3.7 1.1 4.8 After 2023 14.0 4.5 18.5 Total lease payments 56.0 11.0 67.0 Less: Interest (8.4 ) (2.6 ) (11.0 ) Present value of lease liabilities $ 47.6 $ 8.4 $ 56.0 The Company’s annual aggregate future minimum annual rental payments under the previous guidance (“Topic 840”) as of December 31, 2018 were as follows (in millions): Topic 840 December 31, 2018 Operating Leases Finance Leases Total 2019 $ 16.4 $ 2.3 $ 18.7 2020 10.6 1.8 12.4 2021 5.7 1.3 7.0 2022 4.4 1.1 5.5 2023 3.6 1.1 4.7 After 2023 14.3 4.6 18.9 Total lease payments $ 55.0 $ 12.2 $ 67.2
Schedule of Financing Lease Maturities	Maturities of lease liabilities under the new guidance (“Topic 842”) are as follows (in millions): Topic 842 March 31, 2019 Operating Leases Finance Leases Total 2019 $ 14.4 $ 1.4 $ 15.8 2020 12.4 1.6 14.0 2021 7.0 1.3 8.3 2022 4.5 1.1 5.6 2023 3.7 1.1 4.8 After 2023 14.0 4.5 18.5 Total lease payments 56.0 11.0 67.0 Less: Interest (8.4 ) (2.6 ) (11.0 ) Present value of lease liabilities $ 47.6 $ 8.4 $ 56.0 The Company’s annual aggregate future minimum annual rental payments under the previous guidance (“Topic 840”) as of December 31, 2018 were as follows (in millions): Topic 840 December 31, 2018 Operating Leases Finance Leases Total 2019 $ 16.4 $ 2.3 $ 18.7 2020 10.6 1.8 12.4 2021 5.7 1.3 7.0 2022 4.4 1.1 5.5 2023 3.6 1.1 4.7 After 2023 14.3 4.6 18.9 Total lease payments $ 55.0 $ 12.2 $ 67.2
Schedule of Lease Cost, Lease Terms and Supplemental Cash Flow Information	Supplemental lease term and discount rate information related to leases is as follows (in millions): Three Months Ended Weighted-average remaining lease term (years) Operating leases 6.0 Finance leases 7.6 Weighted-average discount rate Operating leases 4.7 % Finance leases 7.6 % Supplemental cash flow information related to leases is as follows (in millions): Three Months Ended Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 4.9 Operating cash flows from finance leases $ 0.2 Financing cash flows from finance leases $ 0.3 Leased assets obtained in exchange for new operating lease liabilities $ 2.4 Leased assets obtained in exchange for new finance lease liabilities $ — The Company’s components of lease cost are as follows (in millions): Three Months Ended Finance lease cost: Amortization of lease assets $ 0.3 Interest on lease liabilities 0.2 Operating lease cost 4.8 Variable lease cost (a) 6.1 Net lease cost $ 11.4 (a) Short-term leases are immaterial and included in variable lease cost.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consist of the following (in millions): March 31, December 31, Finished goods $ 159.1 $ 202.2 Raw materials and supplies 67.0 64.4 Total inventories $ 226.1 $ 266.6

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment, Net	Property, plant and equipment, net, consists of the following (in millions): March 31, December 31, Land, buildings and structures, and leasehold improvements $ 587.5 $ 580.7 Machinery and equipment 996.4 983.2 Office furniture and equipment 56.5 54.4 Mineral interests 169.4 168.1 Construction in progress 123.3 118.3 1,933.1 1,904.7 Less accumulated depreciation and depletion (884.9 ) (852.7 ) Property, plant and equipment, net $ 1,048.2 $ 1,052.0

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)	3 Months Ended
	Mar. 31, 2019
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 2019 2018 Aggregate amortization expense $ 3.6 $ 4.1
Summary of Goodwill	Amounts related to the Company’s goodwill are as follows (in millions): March 31, December 31, Goodwill - Plant Nutrition North America Segment $ 53.8 $ 52.6 Goodwill - Plant Nutrition South America Segment 291.2 292.3 Other 5.9 5.9 Total $ 350.9 $ 350.8

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt consists of the following (in millions): March 31, December 31, Term Loans due July 2021 $ 826.8 $ 828.9 Revolving Credit Facility due July 2021 119.1 197.0 4.875% Senior Notes due July 2024 250.0 250.0 Banco Rabobank Loan due November 2019 18.0 18.1 Banco Itaú Loans due May 2019 to April 2020 0.5 0.8 Financiadora de Estudos e Projetos Loan due November 2023 8.8 9.3 Banco Santander Loan due September 2019 7.7 — Banco Itaú Loan due March 2019 — 2.5 Banco Scotiabank Loan due September 2019 10.3 10.3 3.7% Banco Itaú loan due March 2020 15.4 15.4 Banco Santander loan due September 2020 20.6 20.6 Banco Santander loan due October 2020 16.7 16.8 Banco Santander loan due July 2019 10.3 — Other 1.7 1.7 1,305.9 1,371.4 Less unamortized debt issuance costs (6.1 ) (6.7 ) Total debt 1,299.8 1,364.7 Less current portion (74.2 ) (43.5 ) Long-term debt $ 1,225.6 $ 1,321.2

Operating Segments (Tables)

Operating Segments (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Summary of Segment Information	Segment information is as follows (in millions): Three Months Ended March 31, 2019 Salt Plant Plant Corporate (a) Total Sales to external customers $ 306.4 $ 37.2 $ 57.7 $ 2.4 $ 403.7 Intersegment sales — 0.5 1.5 (2.0 ) — Shipping and handling cost 103.7 6.0 3.2 — 112.9 Operating earnings (loss) 52.3 (1.6 ) (2.6 ) (14.9 ) 33.2 Depreciation, depletion and amortization 15.3 11.6 5.6 2.5 35.0 Total assets (as of end of period) 889.7 594.1 710.6 114.2 2,308.6 Three Months Ended March 31, 2018 Salt Plant Plant Corporate (a) Total Sales to external customers $ 315.9 $ 52.9 $ 66.3 $ 2.8 $ 437.9 Intersegment sales — 0.2 0.4 (0.6 ) — Shipping and handling cost 109.5 6.4 4.2 — 120.1 Operating earnings (loss) 34.1 4.9 0.8 (13.2 ) 26.6 Depreciation, depletion and amortization 14.7 11.3 5.9 2.4 34.3 Total assets (as of end of period) 885.7 580.0 816.8 130.3 2,412.8
Summary of Disaggregated Revenue by Product Type	Disaggregated revenue by product type is as follows (in millions): Three Months Ended March 31, 2019 Salt Plant Plant Corporate (a) Total Highway Deicing Salt $ 218.7 $ — $ — $ — $ 218.7 Consumer & Industrial Salt 87.7 — — — 87.7 SOP and Specialty Plant Nutrients — 37.7 36.6 — 74.3 Industrial Chemicals — — 22.6 — 22.6 Eliminations & Other — (0.5 ) (1.5 ) 2.4 0.4 Sales to external customers $ 306.4 $ 37.2 $ 57.7 $ 2.4 $ 403.7 Three Months Ended March 31, 2018 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Highway Deicing Salt $ 235.4 $ — $ — $ — $ 235.4 Consumer & Industrial Salt 80.5 — — — 80.5 SOP and Specialty Plant Nutrients — 53.1 39.9 — 93.0 Industrial Chemicals — — 26.8 — 26.8 Eliminations & Other — (0.2 ) (0.4 ) 2.8 2.2 Sales to external customers $ 315.9 $ 52.9 $ 66.3 $ 2.8 $ 437.9 (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 Three Months Ended United States (a) $ 238.3 $ 242.2 Canada 87.4 90.8 Brazil 55.7 65.6 United Kingdom 17.3 36.7 Other 5.0 2.6 Total Revenue $ 403.7 $ 437.9 (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)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Summary of Stock-Based Compensation Activity	he following table summarizes stock-based compensation activity during the three months ended March 31, 2019 : Stock Options RSUs PSUs (a) Number Weighted-average exercise price Number Weighted-average fair value Number Weighted-average fair value Outstanding at December 31, 2018 708,746 $ 70.76 83,308 $ 65.75 126,638 $ 69.06 Granted — — 64,350 41.90 — — Exercised (b) — — — — — — Released from restriction (b) — — (22,358 ) 65.33 — — Cancelled/expired (51,230 ) 74.46 (1,281 ) 64.98 (15,375 ) 70.31 Outstanding at March 31, 2019 657,516 $ 70.47 124,019 $ 53.46 111,263 $ 68.89 (a) Until they vest, 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 months ended March 31, 2019 and 2018 , are as follows (in millions): Three Months Ended March 31, 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 before reclassifications (b) 0.2 — 14.5 14.7 Amounts reclassified from accumulated other comprehensive loss (0.1 ) 0.1 — — Net current period other comprehensive income 0.1 0.1 14.5 14.7 Ending balance $ (0.6 ) $ (4.4 ) $ (191.2 ) $ (196.2 ) Three Months Ended March 31, 2018 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (0.9 ) $ (3.9 ) $ (73.1 ) $ (77.9 ) Other comprehensive loss before reclassifications (b) (0.2 ) — (14.4 ) (14.6 ) Amounts reclassified from accumulated other comprehensive loss (0.3 ) 0.1 — (0.2 ) Net current period other comprehensive (loss) income (0.5 ) 0.1 (14.4 ) (14.8 ) Reclassification of stranded tax out of AOCL to retained earnings (c) (0.2 ) — — (0.2 ) Ending balance $ (1.6 ) $ (3.8 ) $ (87.5 ) $ (92.9 ) (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 income (loss) presented in the tables above are reflected net of applicable income taxes. (b) The Company recorded foreign exchange gains (losses) of $2.3 million and $(4.4) million in the three months ended March 31, 2019 and 2018 , respectively, in accumulated other comprehensive loss related to intercompany notes which were deemed to be of a long-term investment nature. (c) In the first quarter of 2018, the Company adopted guidance which allows entities to reclassify tax effects of the change in U.S. income tax rates from accumulated other comprehensive loss to retained earnings.
Summary of Reclassifications out of Accumulated Other Comprehensive Income	The amounts reclassified from AOCL to expense for the three months ended March 31, 2019 and 2018 , are shown below (in millions): Amount Reclassified from AOCL Three Months Ended Three Months Ended Line Item Impacted in the Consolidated Statements of Operations Gains and (losses) on cash flow hedges: Natural gas instruments $ (0.1 ) $ — Product cost Foreign currency contracts (0.1 ) (0.5 ) Interest expense Income tax expense 0.1 0.2 Reclassifications, net of income taxes (0.1 ) (0.3 ) Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.1 Product cost Income tax expense — — Reclassifications, net of income taxes 0.1 0.1 Total reclassifications, net of income taxes $ — $ (0.2 )

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and December 31, 2018 (in millions): Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location March 31, 2019 Consolidated Balance Sheets Location March 31, 2019 Commodity contracts Other current assets $ — Accrued expenses and other current liabilities $ 0.4 Commodity contracts Other assets — Other noncurrent liabilities 0.1 Swap contracts Other current assets 1.9 Accrued expenses and other current liabilities — Swap contracts Other assets 2.6 Other noncurrent liabilities — Total derivatives designated as hedging instruments (a) (b) $ 4.5 $ 0.5 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets an immaterial amount receivable from both counterparties. (b) The Company has both commodity hedge and foreign currency swap agreements with two counterparties each. 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 both counterparties. Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Consolidated Balance Sheets Location December 31, 2018 Consolidated Balance Sheets Location December 31, 2018 Commodity contracts Other current assets $ — Accrued expenses and other current liabilities $ 0.6 Swap contracts Other current assets 2.2 Accrued expenses and other current liabilities — Swap contracts Other assets 2.3 Other noncurrent liabilities — Total derivatives designated as hedging instruments (a)(b) $ 4.5 $ 0.6 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its Consolidated Balance Sheets less than $0.1 million of its commodity contracts that are in a receivable position against its contracts in payable positions. (b) The Company has both commodity hedge and foreign currency swap agreements with two counterparties each. 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 both counterparties.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Summary of Estimated Fair Value of Assets and Liabilities	The estimated fair values for each type of instrument are presented below (in millions): March 31, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.9 $ 1.9 $ — $ — Derivatives – foreign currency contracts, net 4.5 — 4.5 — Total Assets $ 6.4 $ 1.9 $ 4.5 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.9 ) $ (1.9 ) $ — $ — Derivatives – natural gas instruments, net (0.5 ) — (0.5 ) — Total Liabilities $ (2.4 ) $ (1.9 ) $ (0.5 ) $ — (a) Includes mutual fund investments of approximately 25% in common stock of large-cap U.S. companies, 15% 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, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified savings plan (a) $ 1.8 $ 1.8 $ — $ — Derivatives – foreign currency contracts, net 4.5 — 4.5 — Total Assets $ 6.3 $ 1.8 $ 4.5 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.8 ) $ (1.8 ) $ — $ — Derivatives – natural gas instruments, net (0.6 ) — (0.6 ) — Total Liabilities $ (2.4 ) $ (1.8 ) $ (0.6 ) $ — (a) Includes mutual fund investments of approximately 25% 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, 20% in bond funds, 15% in short-term investments and 20% in blended funds.

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2019
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 2019 2018 Numerator: Net earnings $ 7.6 $ 12.6 Less: net earnings allocated to participating securities (a) (0.2 ) (0.1 ) Net earnings available to common shareholders $ 7.4 $ 12.5 Denominator (in thousands): Weighted-average common shares outstanding, shares for basic earnings per share 33,874 33,836 Weighted-average awards outstanding (b) — — Shares for diluted earnings per share 33,874 33,836 Net earnings per common share, basic $ 0.22 $ 0.37 Net earnings per common share, diluted $ 0.22 $ 0.37 (a) Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consist of 233,000 and 163,000 weighted participating securities for the three months ended March 31, 2019 and 2018, respectively. (b) For the calculation of diluted earnings per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted-average number of outstanding common shares. In addition, the Company had 788,000 and 618,000 weighted-average equity awards outstanding for the three months ended March 31, 2019 and 2018, respectively.

Revenue Recognition (Details)

Revenue Recognition (Details)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Payment terms	30 days

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect to retained earnings from change in accounting principle	$ (626.4)		$ (643.5)
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect to retained earnings from change in accounting principle		$ 0.1

Leases - Operating and Finance

Leases - Operating and Finance Leases by Balance Sheets Location (Details) $ in Millions	Mar. 31, 2019USD ($)
Assets
Operating lease assets	$ 47.2
Finance lease assets	6.6
Total leased assets	53.8
Current liabilities:
Current operating lease liabilities	16.7
Current finance lease liabilities	1.4
Noncurrent liabilities:
Other noncurrent operating lease liabilities	30.9
Other noncurrent finance lease liabilities	7
Total lease liabilities	$ 56

Leases - Operating and Financ_2

Leases - Operating and Finance Leases by Income Statement Location (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Amortization of lease assets	$ 0.3
Interest on lease liabilities	0.2
Operating lease cost	4.8
Variable lease cost	6.1
Net lease cost	$ 11.4

Leases - Schedule of Operating

Leases - Schedule of Operating and Finance Lease Maturities (Details) $ in Millions	Mar. 31, 2019USD ($)
Operating Leases, After Adoption of 842
2019	$ 14.4
2020	12.4
2021	7
2022	4.5
2023	3.7
After 2023	14
Total lease payments	56
Less: Interest	(8.4)
Present value of lease liabilities	47.6
Finance Leases, After Adoption of 842
2019	1.4
2020	1.6
2021	1.3
2022	1.1
2023	1.1
After 2023	4.5
Total lease payments	11
Less: Interest	(2.6)
Present value of lease liabilities	8.4
Total, After Adoption of 842
2019	15.8
2020	14
2021	8.3
2022	5.6
2023	4.8
After 2023	18.5
Total lease payments	67
Less: Interest	(11)
Present value of lease liabilities	56
Operating Leases, Before Adoption of 842
2019	16.4
2020	10.6
2021	5.7
2022	4.4
2023	3.6
After 2023	14.3
Total lease payments	55
Capital Leases, Before Adoption of 842
2019	2.3
2020	1.8
2021	1.3
2022	1.1
2023	1.1
After 2023	4.6
Total lease payments	12.2
Total, Before Adoption of 842
2019	18.7
2020	12.4
2021	7
2022	5.5
2023	4.7
After 2023	18.9
Total lease payments	$ 67.2

Leases - Schedule of Lease Term

Leases - Schedule of Lease Terms and Discount Rates (Details)	Mar. 31, 2019
Weighted Average Lease Term [Abstract]
Operating leases	6 years
Finance leases	7 years 7 months 6 days
Weighted Average Discount Rate [Abstract]
Operating leases	4.70%
Finance leases	7.60%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 4.9
Operating cash flows from finance leases	0.2
Financing cash flows from finance leases	0.3
Leased assets obtained in exchange for new operating lease liabilities	2.4
Leased assets obtained in exchange for new finance lease liabilities	$ 0

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished goods	$ 159.1	$ 202.2
Raw materials and supplies	67	64.4
Total inventories	$ 226.1	$ 266.6

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,933.1	$ 1,904.7
Less accumulated depreciation and depletion	(884.9)	(852.7)
Property, plant and equipment, net	1,048.2	1,052
Land, buildings and structures, and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	587.5	580.7
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	996.4	983.2
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	56.5	54.4
Mineral interests
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	169.4	168.1
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 123.3	$ 118.3

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Goodwill [Line Items]
Aggregate amortization expense	$ 3.6	$ 4.1
Goodwill	350.9		$ 350.8
Other
Goodwill [Line Items]
Goodwill	5.9		5.9
Goodwill - Plant Nutrition North America Segment | Operating Segments
Goodwill [Line Items]
Goodwill	53.8		52.6
Goodwill - Plant Nutrition South America Segment | Operating Segments
Goodwill [Line Items]
Goodwill	$ 291.2		$ 292.3

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Intercompany cash payments for tax settlements		$ 5.6	$ 85.7
Tax Year 2007 Through 2016 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Tax liability (refund) from settlement					$ 1.4
Tax Year 2013 Through 2021 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Intercompany cash payments for tax settlements	$ 106.1
Foreign Tax Authority
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		31.1	27.2
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 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Payments for income tax settlements	$ 29.6
Foreign Tax Authority | Canadian Tax Authority
Income Tax Disclosure [Line Items]
Total reassessments including interest		112.2
Amount of security posted in the form of a performance bond		79.1
Amount of security posted in the form of cash		37
Foreign Tax Authority | Canadian Tax Authority | Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Increase to tax expense from settlement				$ 13.8
Foreign Federal 2033
Income Tax Disclosure [Line Items]
Net operating loss carryforwards			1.2
State and Local
Income Tax Disclosure [Line Items]
Net operating loss carryforwards		0.1	$ 0.2
U.S. Federal | Tax Year 2007 Through 2016
Income Tax Disclosure [Line Items]
Tax refund received		3.4
U.S. Federal | Tax Year 2007 Through 2016 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Tax liability (refund) from settlement					(19.4)
U.S. Federal | Tax Year 2013 Through 2021
Income Tax Disclosure [Line Items]
Tax refund received		$ 0.6
U.S. Federal | Tax Year 2013 Through 2021 | Scenario, Forecast
Income Tax Disclosure [Line Items]
Tax liability (refund) from settlement					$ (60.3)

Long-term Debt - Schedule of Lo

Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,305.9	$ 1,371.4
Less unamortized debt issuance costs	(6.1)	(6.7)
Total debt	1,299.8	1,364.7
Less current portion	(74.2)	(43.5)
Long-term debt	1,225.6	1,321.2
Banco Rabobank Loan due November 2019
Debt Instrument [Line Items]
Long-term debt, gross	18	18.1
Banco Itaú Loans due May 2019 to April 2020
Debt Instrument [Line Items]
Long-term debt, gross	0.5	0.8
Financiadora de Estudos e Projetos Loan due November 2023
Debt Instrument [Line Items]
Long-term debt, gross	8.8	9.3
Banco Santander Loan due September 2019
Debt Instrument [Line Items]
Long-term debt, gross	7.7	0
Banco Itaú Loan due March 2019
Debt Instrument [Line Items]
Long-term debt, gross	0	2.5
Banco Scotiabank Loan due September 2019
Debt Instrument [Line Items]
Long-term debt, gross	10.3	10.3
3.7% Banco Itaú loan due March 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 15.4	15.4
Interest rate stated percentage	3.70%
Banco Santander loan due September 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 20.6	20.6
Banco Santander loan due October 2020
Debt Instrument [Line Items]
Long-term debt, gross	16.7	16.8
Banco Santander loan due July 2019
Debt Instrument [Line Items]
Long-term debt, gross	10.3	0
Other
Debt Instrument [Line Items]
Long-term debt, gross	1.7	1.7
Revolving Credit Facility due July 2021 | Revolving Credit Facility due July 2021
Debt Instrument [Line Items]
Long-term debt, gross	119.1	197
Secured Debt | Term Loans due July 2021
Debt Instrument [Line Items]
Long-term debt, gross	826.8	828.9
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%

Long-term Debt - Narrative (Det

Long-term Debt - Narrative (Details)	3 Months Ended
	Sep. 30, 2018USD ($)	Mar. 31, 2019USD ($)loan	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Receivables sold	$ 9,200,000
Cash received	$ 8,600,000
Receivables balance for which company is contingently liable	0.20
Brazilian loans
Debt Instrument [Line Items]
Debt extinguished	$ 36,000,000
Face amount		$ 18,000,000	$ 18,400,000
Number of new Brazilian Reais denominated loans | loan		2
Brazilian loans | Certificado de Deposito Interbancario (CDI)
Debt Instrument [Line Items]
Variable rate, percentage of reference rate			133.10%
Banco Santander loan due September 2020
Debt Instrument [Line Items]
Face amount	$ 20,000,000
Banco Santander loan due September 2020 | Certificado de Deposito Interbancario (CDI)
Debt Instrument [Line Items]
Variable rate, percentage of reference rate	117.50%
Banco Santander loan due July 2019 | Certificado de Deposito Interbancario (CDI)
Debt Instrument [Line Items]
Variable rate, percentage of reference rate		123.00%
Banco Santander Loan due September 2019 | Certificado de Deposito Interbancario (CDI)
Debt Instrument [Line Items]
Variable rate, percentage of reference rate		128.00%

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Maximum exposure for other labor matters	$ 29	$ 31
Produquímica
Loss Contingencies [Line Items]
Contingent liabilities assumed	6.6	7.8
Brazilian Tax Litigation and Assessments
Loss Contingencies [Line Items]
Amount of potential payments	$ 16	$ 15.9

Operating Segments (Details)

Operating Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)Businesssegment	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	3
Segment Reporting Information [Abstract]
Sales	$ 403.7	$ 437.9
Operating earnings (loss)	33.2	26.6
Depreciation, depletion and amortization	35	34.3
Total assets (as of end of period)	2,308.6	2,412.8	$ 2,367.9
United States
Segment Reporting Information [Abstract]
Sales	238.3	242.2
Canada
Segment Reporting Information [Abstract]
Sales	87.4	90.8
Brazil
Segment Reporting Information [Abstract]
Sales	55.7	65.6
United Kingdom
Segment Reporting Information [Abstract]
Sales	17.3	36.7
Other
Segment Reporting Information [Abstract]
Sales	5	2.6
Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	112.9	120.1
Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	218.7	235.4
Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	87.7	80.5
SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	74.3	93
Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	22.6	26.8
Eliminations & Other
Segment Reporting Information [Abstract]
Sales	0.4	2.2
Operating Segments | Salt
Segment Reporting Information [Abstract]
Sales	306.4	315.9
Operating earnings (loss)	52.3	34.1
Depreciation, depletion and amortization	15.3	14.7
Total assets (as of end of period)	889.7	885.7
Operating Segments | Salt | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	103.7	109.5
Operating Segments | Salt | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	218.7	235.4
Operating Segments | Salt | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	87.7	80.5
Operating Segments | Salt | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Salt | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Salt | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Plant Nutrition North America
Segment Reporting Information [Abstract]
Sales	37.2	52.9
Operating earnings (loss)	(1.6)	4.9
Depreciation, depletion and amortization	11.6	11.3
Total assets (as of end of period)	594.1	580
Operating Segments | Plant Nutrition North America | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	6	6.4
Operating Segments | Plant Nutrition North America | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Plant Nutrition North America | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Plant Nutrition North America | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	37.7	53.1
Operating Segments | Plant Nutrition North America | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Plant Nutrition North America | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	$ (0.5)	(0.2)
Operating Segments | Plant Nutrition South America
Segment Reporting Information [Line Items]
Number of primary businesses | Business	2
Segment Reporting Information [Abstract]
Sales	$ 57.7	66.3
Operating earnings (loss)	(2.6)	0.8
Depreciation, depletion and amortization	5.6	5.9
Total assets (as of end of period)	710.6	816.8
Operating Segments | Plant Nutrition South America | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	3.2	4.2
Operating Segments | Plant Nutrition South America | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Plant Nutrition South America | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	0	0
Operating Segments | Plant Nutrition South America | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	36.6	39.9
Operating Segments | Plant Nutrition South America | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	22.6	26.8
Operating Segments | Plant Nutrition South America | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	(1.5)	(0.4)
Corporate & Other
Segment Reporting Information [Abstract]
Sales	2.4	2.8
Operating earnings (loss)	(14.9)	(13.2)
Depreciation, depletion and amortization	2.5	2.4
Total assets (as of end of period)	114.2	130.3
Corporate & Other | Shipping and handling cost
Segment Reporting Information [Abstract]
Shipping and handling cost	0	0
Corporate & Other | Highway Deicing Salt
Segment Reporting Information [Abstract]
Sales	0	0
Corporate & Other | Consumer & Industrial Salt
Segment Reporting Information [Abstract]
Sales	0	0
Corporate & Other | SOP and Specialty Plant Nutrients
Segment Reporting Information [Abstract]
Sales	0	0
Corporate & Other | Industrial Chemicals
Segment Reporting Information [Abstract]
Sales	0	0
Corporate & Other | Eliminations & Other
Segment Reporting Information [Abstract]
Sales	2.4	2.8
Intersegment Sales
Segment Reporting Information [Abstract]
Sales	(2)	(0.6)
Intersegment Sales | Salt
Segment Reporting Information [Abstract]
Sales	0	0
Intersegment Sales | Plant Nutrition North America
Segment Reporting Information [Abstract]
Sales	0.5	0.2
Intersegment Sales | Plant Nutrition South America
Segment Reporting Information [Abstract]
Sales	$ 1.5	$ 0.4

Stockholders' Equity and Equi_3

Stockholders' Equity and Equity Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued shares of treasury stock (in shares)	4,759
Treasury stock reissued (in shares)			25,955
Shares withheld related to vesting of restricted stock units (in shares)	6,737
Fair value of stock withheld related to vestion of restricted stock units	$ 0.2
Tax deficiency from equity compensation awards recorded as an increase to income tax expense	0.2
Compensation expense recorded during period pursuant to stock-based compensation plans	$ 1.1	$ 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)	0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available from conversion (in shares)	1
Service period	3 years
Reissued shares of treasury stock (in shares)	22,358
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	150.00%
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%
2015 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)				3,000,000

Stockholders' Equity and Equi_4

Stockholders' Equity and Equity Instruments - Stock-Based Compensation Activity (Details)	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Stock Options
Number
Outstanding at beginning of period (in shares)	708,746
Granted (in shares)	0
Exercised (in shares)	0
Cancelled/expired (in shares)	(51,230)
Outstanding at end of period (in shares)	657,516
Weighted-average exercise price
Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares	$ 70.76
Weighted-average exercise price, granted (in dollars per share) | $ / shares	0
Weighted-average exercise price, exercised (in dollars per share) | $ / shares	0
Weighted-average exercise price, cancelled/expired (in dollars per share) | $ / shares	74.46
Weighted-average exercise price at end of period (in dollars per share) | $ / shares	$ 70.47
RSUs
Number
Outstanding at beginning of period (in shares)	83,308
Granted (in shares)	64,350
Released from restriction (in shares)	(22,358)
Cancelled/expired (in shares)	(1,281)
Outstanding at end of period (in shares)	124,019
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) | $ / shares	$ 65.75
Weighted-average fair value, granted (in dollars per share) | $ / shares	41.90
Weighted-average fair value, released from restriction (in dollars per share) | $ / shares	65.33
Weighted-average fair value, cancelled/expired (in dollars per share) | $ / shares	64.98
Weighted-average fair value at end of period (in dollars per share) | $ / shares	$ 53.46
PSUs
Number
Outstanding at beginning of period (in shares)	126,638
Granted (in shares)	0
Released from restriction (in shares)	0
Cancelled/expired (in shares)	(15,375)
Outstanding at end of period (in shares)	111,263
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) | $ / shares	$ 69.06
Weighted-average fair value, granted (in dollars per share) | $ / shares	0
Weighted-average fair value, released from restriction (in dollars per share) | $ / shares	0
Weighted-average fair value, cancelled/expired (in dollars per share) | $ / shares	70.31
Weighted-average fair value at end of period (in dollars per share) | $ / shares	$ 68.89
PSU at grant date (in shares per unit)	1

Stockholders' Equity and Equi_5

Stockholders' Equity and Equity Instruments - Components and Changes In AOCL (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 540.2	$ 694.6
Other comprehensive income (loss) before reclassifications	14.7	(14.6)
Amounts reclassified from accumulated other comprehensive loss	0	(0.2)
Net current period other comprehensive (loss) income	14.7	(14.8)
Reclassification of stranded tax out of AOCL to retained earnings		0
Ending balance	538.8	669.1
Gains (loss) on foreign exchange of intercompany notes of long-term nature	2.3	(4.4)
Gains and (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(0.7)	(0.9)
Other comprehensive income (loss) before reclassifications	0.2	(0.2)
Amounts reclassified from accumulated other comprehensive loss	(0.1)	(0.3)
Net current period other comprehensive (loss) income	0.1	(0.5)
Reclassification of stranded tax out of AOCL to retained earnings		(0.2)
Ending balance	(0.6)	(1.6)
Defined Benefit Pension
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(4.5)	(3.9)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	0.1	0.1
Net current period other comprehensive (loss) income	0.1	0.1
Reclassification of stranded tax out of AOCL to retained earnings		0
Ending balance	(4.4)	(3.8)
Foreign Currency
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(205.7)	(73.1)
Other comprehensive income (loss) before reclassifications	14.5	(14.4)
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current period other comprehensive (loss) income	14.5	(14.4)
Reclassification of stranded tax out of AOCL to retained earnings		0
Ending balance	(191.2)	(87.5)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(210.9)	(77.9)
Reclassification of stranded tax out of AOCL to retained earnings		(0.2)
Ending balance	$ (196.2)	$ (92.9)

Stockholders' Equity and Equi_6

Stockholders' Equity and Equity Instruments - Reclassifications From AOCL (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (16.2)	$ (13.7)
Income tax expense	4.9	4.4
Net earnings	7.6	12.6
Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	(218.2)	(252.4)
Amount Reclassified from AOCL
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net earnings	0	(0.2)
Amount Reclassified from AOCL | Gains and (losses) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0.1	0.2
Net earnings	(0.1)	(0.3)
Amount Reclassified from AOCL | Amortization of defined benefit pension:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0	0
Net earnings	0.1	0.1
Amount Reclassified from AOCL | Amortization of defined benefit pension: | Product cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.1	0.1
Natural gas instruments | Amount Reclassified from AOCL | Gains and (losses) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	(0.1)	0
Foreign currency contracts | Amount Reclassified from AOCL | Gains and (losses) on cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (0.1)	$ (0.5)

Derivative Financial Instrume_3

Derivative Financial Instruments - Narrative (Details) MMBTU in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)MMBTU	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)MMBTU	Feb. 28, 2018USD ($)
Natural gas instruments
Derivatives, Fair Value [Line Items]
Notional amount (in MMBtus) | MMBTU	1.6		1
Net losses to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months	$ 0.4
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 | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount				$ 19.9
Forward contracts
Derivatives, Fair Value [Line Items]
Notional amount			$ 11.9
Gain (loss) on changes in fair value of derivative instruments		$ 0.3
Swap contracts | Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount	$ 26.2
Gain (loss) expected to be reclassified during the next twelve months	$ 1.9

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Hedged Items (Details) $ in Millions	Mar. 31, 2019USD ($)counterparty	Dec. 31, 2018USD ($)counterparty
Natural gas instruments
Derivatives, Fair Value [Line Items]
Number of counterparties | counterparty	2	2
Netting of contracts in a receivable position against contracts in payable position		$ 0.1
Swap contracts
Derivatives, Fair Value [Line Items]
Number of counterparties | counterparty	2	2
Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4.5	$ 4.5
Liability Derivatives	0.5	0.6
Derivatives Designated as Hedging Instruments | Natural gas instruments | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Derivatives Designated as Hedging Instruments | Natural gas instruments | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.4	0.6
Derivatives Designated as Hedging Instruments | Natural gas instruments | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	0
Derivatives Designated as Hedging Instruments | Natural gas instruments | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.1
Derivatives Designated as Hedging Instruments | Swap contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	1.9	2.2
Derivatives Designated as Hedging Instruments | Swap contracts | Accrued expenses and other current liabilities
Derivatives, Fair Value [Line Items]
Liability Derivatives	0	0
Derivatives Designated as Hedging Instruments | Swap contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Derivatives	2.6	2.3
Derivatives Designated as Hedging Instruments | Swap contracts | Other noncurrent 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	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Mutual Fund Investments, Concentration Risk | Common Stock, Large Cap US Companies
Liability Class:
Concentration Risk, Percentage	25.00%	25.00%
Mutual Fund Investments, Concentration Risk | Common Stock of Small to Mid Cap US Companies
Liability Class:
Concentration Risk, Percentage	15.00%	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%	20.00%
Mutual Fund Investments, Concentration Risk | Short-Term Investments
Liability Class:
Concentration Risk, Percentage	15.00%	15.00%
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	$ 1.9	$ 1.8
Derivatives – foreign currency contracts, net	4.5	4.5
Total Assets	6.4	6.3
Liability Class:
Liabilities related to non-qualified savings plan	(1.9)	(1.8)
Derivatives – natural gas instruments, net	(0.5)	(0.6)
Total Liabilities	(2.4)	(2.4)
Fair Value, Measurements, Recurring | Level One
Asset Class:
Mutual fund investments in a non-qualified savings plan	1.9	1.8
Derivatives – foreign currency contracts, net	0	0
Total Assets	1.9	1.8
Liability Class:
Liabilities related to non-qualified savings plan	(1.9)	(1.8)
Derivatives – natural gas instruments, net	0	0
Total Liabilities	(1.9)	(1.8)
Fair Value, Measurements, Recurring | Level Two
Asset Class:
Mutual fund investments in a non-qualified savings plan	0	0
Derivatives – foreign currency contracts, net	4.5	4.5
Total Assets	4.5	4.5
Liability Class:
Liabilities related to non-qualified savings plan	0	0
Derivatives – natural gas instruments, net	(0.5)	(0.6)
Total Liabilities	(0.5)	(0.6)
Fair Value, Measurements, Recurring | Level Three
Asset Class:
Mutual fund investments in a non-qualified savings plan	0	0
Derivatives – foreign currency contracts, net	0	0
Total Assets	0	0
Liability Class:
Liabilities related to non-qualified savings plan	0	0
Derivatives – natural gas instruments, net	0	0
Total Liabilities	$ 0	$ 0

Fair Value Measurement - Narrat

Fair Value Measurement - Narrative (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
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	$ 233,800,000	$ 226,300,000
Aggregate principal amount due at maturity	250,000,000	250,000,000
Term Loan
Debt Instrument [Line Items]
Aggregate principal amount due at maturity	945,900,000	1,030,000,000
Fair value of credit agreement debt	939,400,000	1,020,000,000
Fair Value, Measurements, Recurring
Debt Instrument [Line Items]
Mutual fund investments in a non-qualified savings plan	1,900,000	1,800,000
Fair Value, Measurements, Recurring | Level One
Debt Instrument [Line Items]
Mutual fund investments in a non-qualified savings plan	$ 1,900,000	$ 1,800,000

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net earnings	$ 7.6	$ 12.6
Less: net earnings allocated to participating securities	(0.2)	(0.1)
Net earnings available to common shareholders	$ 7.4	$ 12.5
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share (in shares)	33,874	33,836
Weighted-average awards outstanding (in shares)	0	0
Shares for diluted earnings per share (in shares)	33,874	33,836
Net earnings per common share, basic (in dollars per share)	$ 0.22	$ 0.37
Net earnings per common share, diluted (in dollars per share)	$ 0.22	$ 0.37
Participating securities (in shares)	233	163
Weighted anti-dilutive awards outstanding (in shares)	788	618

Uncategorized Items - cmp-20190

Label	Element	Value
Accounting Standards Update 2016-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (100,000)
Accounting Standards Update 2016-02 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (100,000)