Compass Minerals International (CMP) 10-Q 8 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 04, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	COMPASS MINERALS INTERNATIONAL INC
Entity Central Index Key	1,227,654
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,824,058
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 33.9	$ 77.4
Receivables, less allowance for doubtful accounts of $9.4 in 2017 and $9.0 in 2016	176.3	320.9
Inventories	287.9	280.6
Other	41.4	36.1
Total current assets	539.5	715
Property, plant and equipment, net	1,116.8	1,092.3
Intangible assets, net	149.8	157.6
Goodwill	403.2	412.2
Investment in equity investee	24.1	24.9
Other	64.5	64.5
Total assets	2,297.9	2,466.5
Current liabilities:
Current portion of long-term debt	82.8	130.2
Accounts payable	80.7	100.8
Accrued expenses	61.3	105.3
Accrued salaries and wages	20.4	22.6
Income taxes payable	0.2	4.4
Accrued interest	8.6	8.7
Total current liabilities	254	372
Long-term debt, net of current portion	1,172.8	1,194.8
Deferred income taxes, net	130.4	130.8
Other noncurrent liabilities	47	51.8
Commitments and contingencies
Stockholders’ equity:
Common stock: $0.01 par value, 200,000,000 authorized shares; 35,367,264 issued shares	0.4	0.4
Additional paid-in capital	99.9	97.1
Treasury stock, at cost — 1,543,856 shares at June 30, 2017, and 1,577,960 shares at December 31, 2016	(2.9)	(3)
Retained earnings	693.7	727.5
Accumulated other comprehensive loss	(97.4)	(104.9)
Total stockholders’ equity	693.7	717.1
Total liabilities and stockholders’ equity	$ 2,297.9	$ 2,466.5

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Allowance for doubtful accounts	$ 9.4	$ 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)	1,543,856	1,577,960

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Sales	$ 228	$ 169.5	$ 615.8	$ 515.2
Shipping and handling cost	40.6	37.1	134.3	126.5
Product cost	142.5	91.1	355	244.8
Gross profit	44.9	41.3	126.5	143.9
Selling, general and administrative expenses	38.9	25.8	79.1	54.1
Operating earnings	6	15.5	47.4	89.8
Other (income) expense:
Interest expense	12.3	5.6	26	11.4
Net (earnings) loss in equity investee	(0.2)	1.7	(0.2)	1.3
Other, net	1.8	0.9	1.7	0.1
(Loss) earnings before income taxes	(7.9)	7.3	19.9	77
Income tax (benefit) expense	(1.5)	1	4.8	21
Net (loss) earnings	$ (6.4)	$ 6.3	$ 15.1	$ 56
Basic net (loss) earnings per common share (in dollars per share)	$ (0.19)	$ 0.18	$ 0.44	$ 1.65
Diluted net (loss) earnings per common share (in dollars per share)	$ (0.19)	$ 0.18	$ 0.44	$ 1.65
Weighted-average common shares outstanding (in thousands):
Basic (in shares)	33,823	33,784	33,813	33,766
Diluted (in shares)	33,823	33,787	33,813	33,769
Cash dividends per share (in dollars per share)	$ 0.72	$ 0.695	$ 1.44	$ 1.39

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (6.4)	$ 6.3	$ 15.1	$ 56
Other comprehensive income (loss):
Unrealized gain from change in pension obligations, net of tax of $(0.0) in both the three and six months ended June 30, 2017, and 2016, respectively.	0.1	0.1	0.2	0.2
Unrealized (loss) gain on cash flow hedges, net of tax of $0.2 and $0.5 in the three and six months ended June 30, 2017, respectively, and $(0.7) and $(0.8) in the three and six months ended June 30, 2016, respectively.	(0.4)	1.2	(0.9)	1.4
Cumulative translation adjustment	(6.6)	(3.3)	8.2	31.1
Comprehensive (loss) income	$ (13.3)	$ 4.3	$ 22.6	$ 88.7

CONSOLIDATED STATEMENTS OF COM6

CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain from change in pension obligations, tax	$ 0	$ 0	$ 0	$ 0
Unrealized (loss) gain on cash flow hedges, tax	$ 0.2	$ (0.7)	$ 0.5	$ (0.8)

CONSOLIDATED STATEMENT OF STOCK

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance at Dec. 31, 2015						$ (108.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	$ 88.7
Ending balance at Jun. 30, 2016						(75.6)
Beginning balance at Mar. 31, 2016						(73.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	4.3
Ending balance at Jun. 30, 2016						(75.6)
Beginning balance at Dec. 31, 2016	717.1	$ 0.4	$ 97.1	$ (3)	$ 727.5	(104.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	22.6				15.1	7.5
Dividends on common stock	(48.8)		0.1		(48.9)
Shares issued for stock units	0		(0.1)	0.1
Stock options exercised	0.3		0.3
Stock-based compensation	2.5		2.5
Ending balance at Jun. 30, 2017	693.7	0.4	99.9	(2.9)	693.7	(97.4)
Beginning balance at Mar. 31, 2017						(90.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	(13.3)
Ending balance at Jun. 30, 2017	$ 693.7	$ 0.4	$ 99.9	$ (2.9)	$ 693.7	$ (97.4)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net (loss) earnings	$ 15.1	$ 56
Adjustments to reconcile net earnings to net cash flows provided by operating activities:
Depreciation, depletion and amortization	56.4	40.9
Finance fee amortization	1.1	0.6
Early extinguishment of debt	0	0.1
Stock-based compensation	2.5	2.6
Deferred income taxes	(0.6)	(4.1)
Net (earnings) loss in equity method investee	(0.2)	1.3
Gain on settlement of acquisition-related contingent consideration	(1.9)	0
Other, net	1.4	(0.6)
Changes in operating assets and liabilities:
Receivables	145.1	78.2
Inventories	(6.9)	35.8
Other assets	(3.7)	(0.2)
Accounts payable and accrued expenses	(64.2)	(60.5)
Other liabilities	(0.9)	(0.2)
Net cash provided by operating activities	143.2	149.9
Cash flows from investing activities:
Capital expenditures	(55.6)	(94.8)
Investment in equity method investee	0	(4.7)
Other, net	(2.7)	(1.5)
Net cash used in investing activities	(58.3)	(101)
Cash flows from financing activities:
Proceeds from revolving credit facility borrowings	100.3	183.5
Principal payments on revolving credit facility borrowings	(122.6)	(80.5)
Proceeds from issuance of long-term debt	11.6	400
Principal payments on long-term debt	(59.2)	(473.4)
Acquisition-related contingent consideration payment	(12.8)	0
Dividends paid	(48.9)	(47.1)
Fees paid to refinance debt	0	(1.5)
Deferred financing costs	(0.2)	(3.5)
Proceeds received from stock option exercises	0.3	0.7
Excess tax benefit (deficiency) from equity compensation awards	0	(0.2)
Other, net	1	0
Net cash used in financing activities	(130.5)	(22)
Effect of exchange rate changes on cash and cash equivalents	2.1	7.4
Net change in cash and cash equivalents	(43.5)	34.3
Cash and cash equivalents, beginning of the year	77.4	58.4
Cash and cash equivalents, end of period	33.9	92.7
Supplemental cash flow information:
Interest paid, net of amounts capitalized	20.2	10.7
Income taxes paid, net of refunds	$ 16.6	$ 44.8

Accounting Policies and Basis o

Accounting Policies and Basis of Presentation	6 Months Ended
	Jun. 30, 2017
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, and 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, sulfate of potash (“SOP”), various other micronutrient products and specialty chemicals for water treatment and other industrial processes. 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. The Company also provides records management services to businesses located in the U.K. In October 2016, the Company acquired Produquímica Indústria e Comércio S.A. (“Produquímica”), which operates two primary businesses in Brazil – agricultural productivity and chemical solutions. 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 (“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, 2016 , as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring accruals considered necessary for a fair presentation, have been included. The Company experiences a substantial amount of seasonality in its sales with respect to its deicing salt products. As a result, sales and operating income are generally higher in the first and fourth quarters and lower during the second and third quarters of each year. In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the 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 our sales volumes and net 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). Recent Accounting Pronouncements In January 2017, the Financial Accounting Standards Board (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 will remain 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 plans to early adopt the guidance for its 2017 impairment testing. In August 2016, the FASB issued guidance to clarify how certain cash receipts and payments should be presented and classified in the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the timing of adoption of this guidance and the impact of the adoption of this guidance 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 of the adoption of this guidance on its consolidated financial statements. In March 2016, the FASB issued guidance to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The Company adopted this guidance in the first quarter of 2017 on a prospective basis, and prior periods have not been adjusted. The Company elected the option available under the new guidance to continue to estimate the effect of forfeitures in the calculation of share-based payment expense. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. 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. Under this guidance, an entity must also recognize a lease liability which represents a lessee’s obligation to make lease payments for the right to use the asset. In addition, the standard requires expanded qualitative and quantitative disclosures. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and requires a modified retrospective transition method. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. In July 2015, the FASB issued guidance that requires entities to measure inventory within the scope of the standard at the lower of cost or net realizable value. “Net realizable value” is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company adopted this guidance in the first quarter of 2017. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers. The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those years, and early adoption is permitted. The guidance permits the use of either a full or modified retrospective transition method. The Company expects to use the modified retrospective transition method. While the Company has not identified any material differences in the amount and timing of revenue recognition for the revenue streams management has reviewed thus far, the Company is still evaluating the impact of this guidance and it has not concluded on the overall impact of adopting this guidance. Adoption of this guidance will significantly impact the Company’s financial statement disclosures regarding revenue.

Acquisition

Acquisition	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Acquisition	Acquisition: Background and Financing On December 16, 2015, Compass Minerals do Brasil Ltda., a wholly owned subsidiary of the Company (“Compass Minerals Brazil”), entered into (i) a subscription agreement and other covenants (as amended, the “Subscription Agreement”) with certain shareholders of Produquímica and Produquímica and (ii) a share purchase and sale agreement and other covenants (the “Purchase Agreement”) with certain shareholders of Produquímica and Produquímica. Pursuant to the Subscription Agreement and the Purchase Agreement, Compass Minerals Brazil acquired 35% of the issued and outstanding capital stock of Produquímica on December 23, 2015, for R$452.4 million Brazilian Reais (“R” or “BRL”), or $114.1 million U.S. dollars at closing, and paid additional consideration of $4.7 million in the second quarter of 2016 related to Produquímica’s 2015 financial performance. The Subscription Agreement also contained a put right (the “Put”), allowing the Produquímica shareholders to sell the remainder of their interests in Produquímica to Compass Minerals Brazil. On August 12, 2016, Produquímica shareholders notified Compass Minerals Brazil of their exercise of the Put. On October 3, 2016, the Company acquired the remaining 65% of the issued and outstanding capital stock of Produquímica. The Company entered into a new $100.0 million term loan tranche in the fourth quarter of 2015 to fund the acquisition of the 35% of Produquímica’s equity. In September 2016, the Company entered into a new $450.0 million term loan tranche to fund the acquisition of the remaining 65% of Produquímica’s equity. See Note 7 for more information regarding these financings. Based in São Paulo, Brazil, Produquímica operates two primary businesses – agricultural productivity and chemical solutions. The agricultural productivity division manufactures and distributes a broad offering of specialty plant nutrition solution-based products. These include micronutrients, controlled release fertilizers and other specialty supplements that are used in direct soil and foliar applications, as well as through irrigation systems and for seed treatment. Many of these products are developed through Produquímica’s research and development capabilities. Produquímica also manufactures and markets specialty chemicals, primarily used in the industrial chemical and water treatment industries in Brazil. The acquisition broadens the Company’s geographic scope of operations and expands its specialty plant nutrition portfolio while reducing the Company’s dependence on winter weather conditions. Purchase Price Allocation The Company accounted for the Produquímica acquisition as a business combination in accordance with U.S. GAAP. The guidance for business combinations requires estimates and judgments regarding expectations for future cash flows of the acquired entity as well as other valuation assumptions and an allocation to the net assets acquired. The fair values assigned to tangible and intangible assets acquired and liabilities assumed, including contingent consideration, are based on management’s best estimates. As of June 30, 2017 , the preliminary purchase price allocation was not finalized. The preliminary purchase price allocation may be adjusted during the measurement period, which is up to one year after the acquisition date. The Company is currently finalizing the fair values of intangible assets, intangible and tangible asset useful lives, additional assumed liabilities and labor and tax contingencies. A summary of the acquisition-date fair value of the consideration transferred is presented in the table below: Fair Value of Consideration Transferred (in millions) October 3, 2016 Cash paid at closing $ 317.1 Additional cash due at closing 20.6 Fair value of contingent consideration 31.4 Fair value of 35% equity investment 178.7 Total $ 547.8 The calculation of the purchase price at closing was based in part on an estimate of full-year 2016 operating results of Produquímica. As of the acquisition closing date, some of the periods included in the 2016 operating results of Produquímica had not ended and actual results were not known. The portion of the purchase price which was based on management’s estimate of results relating to periods which occurred after the closing date was classified as contingent consideration. There were no thresholds or tiers in the payment structure, and management used an income approach to estimate the acquisition date fair value of the contingent consideration. As of the closing date, the Company had estimated the fair value of contingent consideration to be $31.4 million . During the first quarter of 2017, the purchase price was adjusted based on the final full-year 2016 operating results of Produquímica, and a final payment was made to the Produquímica shareholders. The difference between the estimated closing date fair value of the contingent consideration and the final amount paid resulted in the recognition of a gain of $1.9 million in the first quarter of 2017, which was included as a component of operating earnings in the Company’s Plant Nutrition South America segment. Prior to the acquisition closing date, the Company accounted for its 35% interest in Produquímica as an equity method investment. The acquisition-date fair value of the previously held equity investment was $178.7 million and is included in the consideration transferred. To measure the acquisition closing date fair value of the equity interest, the Company utilized a market-based approach which relied on Level 3 inputs (see Note 12 for a discussion of the levels in the fair value hierarchy). The Company recognized a $59.3 million non-cash gain during the fourth quarter of 2016 as a result of remeasuring its prior equity interest in Produquímica held before the business combination. Under the acquisition method of accounting, the total purchase price is allocated on a preliminary basis to Produquímica’s assets and liabilities based upon their estimated fair value as of the closing date of the acquisition. During the first six months of 2017, the Company adjusted the preliminary purchase price allocation based on additional information obtained regarding facts and circumstances which existed as of the acquisition date. These adjustments resulted in a decrease of $3.6 million to goodwill, a decrease of $4.4 million to other noncurrent liabilities and an increase of $0.8 million to net deferred income taxes. Based upon the final purchase price and the updated preliminary valuation, the purchase price allocation, which is still subject to change based on the Company’s final analysis, is presented in the table below: Recognized amounts of identifiable assets acquired and liabilities assumed: Purchase Price Allocation Cash and cash equivalents $ 73.8 Accounts receivable 89.4 Inventory 77.1 Other current assets 13.7 Property, plant and equipment 189.4 Identified intangible assets 81.2 Investment in equity method investee 24.5 Other noncurrent assets 6.9 Accounts payable (27.1 ) Accrued expenses (40.3 ) Current portion of long-term debt (129.6 ) Other current liabilities (14.0 ) Long-term debt, net of current portion (62.0 ) Deferred income taxes, net (66.0 ) Other noncurrent liabilities (21.9 ) Total identifiable net assets 195.1 Goodwill 352.7 Total fair value of business combination $ 547.8 The total purchase price in excess of the net identifiable assets has been recognized as goodwill in the amount of $352.7 million and has been assigned to the Company’s new Plant Nutrition South America segment. The goodwill recognized is attributable primarily to expected synergies with the Company’s existing plant nutrition business and the assembled workforce of Produquímica. The future deductibility of the goodwill for income tax purposes is uncertain at this time. The Company determined that the book value of the accounts receivables included in the purchase price allocation approximates their fair value due to their short-term nature. The gross contractual amounts of the receivables exceeds their fair value, because the receivables balance has been reduced by an allowance for doubtful accounts. In connection with the acquisition, the Company acquired identifiable intangible assets which consisted principally of trade names, developed technologies and customer relationships. The fair values were determined using Level 3 inputs (see Note 12 for a discussion of the levels in the fair value hierarchy). The fair values of the identifiable intangible assets were estimated using an income approach method. The estimated fair values and weighted average amortization period of the identifiable intangible assets are presented in the table below: Estimated Fair Value (in millions) Weighted-Average Amortization Period (in years) Trade names $ 36.9 11.0 Developed technology 37.5 5.3 Customer relationships 6.8 13.5 Total identifiable intangible assets $ 81.2 8.6 Impact on Operating Results During the six months ended June 30, 2017 , Produquímica contributed revenues of $127.4 million and net losses of $8.8 million . The following table presents combined unaudited pro forma results for the three and six months ended June 30, 2016. The pro forma financial information combines the historical results of operations for Produquímica and Compass Minerals as though the acquisition occurred on January 1, 2015. The pro forma information does not purport to represent the actual results of operations that Produquímica and Compass Minerals would have achieved had the companies been combined during the periods presented nor is the information intended to project the future results of operations. Certain adjustments to Produquímica’s historical results have been made to conform to U.S. GAAP and amounts have been translated to U.S. dollars. Unaudited Combined Pro Forma Results of Operations (in millions) Three Months Ended Six Months Ended Revenues $ 241.3 $ 648.3 Net income 6.2 50.2 Significant adjustments to the pro forma information above include: • Adjustments to exclude non-recurring direct incremental costs of the acquisition • Adjustments to expenses relating to the financing transactions described above • Adjustments to reflect incremental amortization and depreciation from the preliminary allocation of the purchase price • Adjustments to reflect certain income tax effects of the acquisition • Adjustments to remove net earnings related to the previously held 35% equity interest in Produquímica

Inventories

Inventories	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories: Inventories consist of the following (in millions): June 30, December 31, Finished goods $ 208.1 $ 206.1 Raw materials and supplies 79.8 74.5 Total inventories $ 287.9 $ 280.6

Property, Plant and Equipment,

Property, Plant and Equipment, Net	6 Months Ended
	Jun. 30, 2017
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): June 30, December 31, Land, buildings and structures, and leasehold improvements $ 490.8 $ 480.1 Machinery and equipment 879.3 848.2 Office furniture and equipment 29.3 28.3 Mineral interests 170.7 168.5 Construction in progress 281.2 243.6 1,851.3 1,768.7 Less accumulated depreciation and depletion (734.5 ) (676.4 ) Property, plant and equipment, net $ 1,116.8 $ 1,092.3

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, Net	Goodwill and Intangible Assets, Net: Aggregate amortization expense for the Company’s finite-lived intangible assets was $4.0 million and $1.1 million in the second quarters of 2017 and 2016 , respectively, and $8.1 million and $2.1 million in the first six months of 2017 and 2016 , respectively. The increases in amortization expense were primarily due to amortization of the additional finite-lived intangible assets which were recognized as a result of the preliminary purchase price allocation for the Produquímica acquisition (see Note 2 for more information). The Company had goodwill of $403.2 million and $412.2 million as of June 30, 2017 , and December 31, 2016 , respectively, in its consolidated balance sheets. Of these amounts, $55.3 million and $53.6 million of the amounts recorded for goodwill as of June 30, 2017 , and December 31, 2016 , respectively, were recorded in the Company’s Plant Nutrition North America segment, and $341.9 million and $352.8 million of the amounts recorded for goodwill as of June 30, 2017 and December 31, 2016 , respectively, were recorded in the Company’s Plant Nutrition South America segment. The remaining amounts in both periods were immaterial and recorded in the Company’s Salt segment and corporate and other. The change in goodwill between December 31, 2016 , and June 30, 2017 , was primarily due to the impact from translating foreign-denominated amounts to U.S. dollars and purchase price adjustments made related to the Produquímica acquisition (see Note 2 for more information).

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: The Company’s effective income tax rate differs from the U.S. statutory federal income tax rate primarily due to U.S. statutory depletion, state income taxes (net of federal tax benefit), foreign income tax rate differentials, foreign mining taxes, domestic manufacturing deductions and interest expense recognition differences for book and tax purposes. The Company’s effective rate is impacted by permanent tax deductions which have a less favorable impact as pretax income increases. The Company had $61.6 million and $53.6 million as of June 30, 2017 , and December 31, 2016 , respectively, of gross foreign federal net operating loss (“NOL”) carryforwards that have no expiration date. In addition, the Company had $9.2 million and $7.5 million as of June 30, 2017 , and December 31, 2016 , respectively, of gross foreign federal NOL carryforwards which expire beginning in 2033 and $1.1 million and $0.9 million as of June 30, 2017 , and December 31, 2016 , respectively, of tax-effected state NOL carryforwards which expire beginning in 2033 . 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 - 2012 . The reassessments are a result of ongoing audits and total $99.8 million , including interest through June 30, 2017 . The Company disputes these reassessments and will continue to work with the appropriate authorities in Canada to resolve the dispute. Although the Company believes it has recorded an adequate reserve for this matter, 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 $61.2 million performance bond, has paid $33.9 million (most of which is recorded in other assets in its consolidated balance sheets) and the remaining balance of $4.7 million will be addressed later this year, which is necessary to proceed with future appeals or litigation. In addition, Canadian federal and provincial taxing authorities have reassessed the Company for years 2004 - 2006 , which had been previously settled by agreement among the Company, the Canada Revenue Agency and the Internal Revenue Service of the United States. The Company sought to enforce the agreement, which provided the basis upon which the returns were previously filed and settled. In July 2016, a trial commenced in the Tax Court of Canada with respect to the Canadian federal tax issues for these matters, and in March 2017, the Tax Court of Canada ruled in favor of the Company. The decision of the Tax Court of Canada was not appealed by the Canada Revenue Agency. As a result, the Company believes that reassessed Canadian tax, penalties and interest for the Company for years 2004-2006 of approximately $94.7 million are effectively resolved. The Company is in the process of having certain posted collateral returned in connection with the resolution of the dispute. The Company received Canadian income tax reassessments for years 2007 - 2008 . The total amount of the reassessments, including penalties and interest through June 30, 2017 , related to this matter is $35.7 million . The Company does not agree with these adjustments and is receiving assistance from the tax jurisdictions for relief from the impact of double taxation as available in the tax treaty between the U.S. and Canada. The Company has filed protective Notices of Objection and has posted collateral in the form of a $9.8 million performance bond and a $10.1 million bank letter guarantee, which is necessary to proceed with future appeals or litigation. Although the outcome of examinations by taxing authorities is uncertain, the Company believes it has adequately reserved for this matter. The Company will be required by 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 dispute is resolved. The Company expects that the ultimate outcome of these matters will not have a material impact on its results of operations or financial condition. However, the Company can provide no assurance as to the ultimate outcome of these matters, and the impact could be material if they are not resolved in the Company’s favor. As of June 30, 2017 , the amount reserved related to these reassessments was immaterial to the Company’s consolidated financial statements. Additionally, the Company has other uncertain tax positions as well as assessments and disputed positions with taxing authorities in its various jurisdictions, which are consistent with those matters disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

Long-term Debt

Long-term Debt	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt: Long-term debt consists of the following (in millions): June 30, December 31, Term Loans due July 2021 $ 841.6 $ 845.9 Revolving Credit Facility due July 2021 83.1 105.4 4.875% Senior Notes due July 2024 250.0 250.0 Banco Bradesco Loan due February 2017 — 13.2 Banco Votorantim Loan due April 2017 — 12.4 Banco Bradesco Loan due July 2017 — 4.8 Scotiabank Loan due August 2017 — 20.2 Banco Itaú Loans due September 2017 15.8 15.1 Scotiabank Loan due September 2017 15.0 15.1 Banco Votorantim Loan due September 2017 — 0.8 Banco Bradesco Loan due October 2017 17.0 16.8 Rabobank Loan due November 2017 22.3 22.6 Banco Itaú Loans due May 2019 to April 2020 2.4 3.1 Banco do Brasil Loan due November 2017 0.5 — Financiadora de Estudos e Projetos Loan due November 2023 13.5 7.4 Banco do Brasil Loan due September 2017 0.1 — Banco do Brasil Loan due October 2017 0.3 — Banco Safra Loan due September 2017 0.8 — Banco do Brasil Loan due February 2018 0.2 — 1,262.6 1,332.8 Less unamortized debt issuance costs (7.0 ) (7.8 ) Total Debt 1,255.6 1,325.0 Less current portion (82.8 ) (130.2 ) Long-term debt $ 1,172.8 $ 1,194.8 In September 2016, the Company entered into a new $450 million term loan tranche under its existing credit agreement to fund the acquisition of the remaining 65% of Produquímica’s equity in October 2016 (see Note 2 for more information). This additional tranche will mature July 1, 2021, and bears interest at LIBOR plus 2.0% . In connection with this transaction, the Company incurred $2.2 million of financing fees in 2016 ( $0.7 million was recorded as an expense and $1.5 million was capitalized as deferred financing costs). In April 2016, the Company refinanced its existing $471 million term loans and $125 million revolving credit facility with a new $400 million senior secured term loan and a $300 million senior secured revolving credit facility, which both mature July 1, 2021. The new term loan and revolving credit facility bear interest at LIBOR plus 1.75% based on the Company’s current leverage ratio and credit rating. In connection with the refinancing, the Company incurred $5.8 million of refinancing fees ( $1.4 million was recorded as an expense and $4.4 million was capitalized as deferred financing costs) and wrote-off $0.1 million of existing deferred financing costs related to the previous term loans and revolving credit facility. As of June 30, 2017 , the term loans and revolving credit facility 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	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: The Company was involved in proceedings alleging unfair labor practices at its Cote Blanche, Louisiana, mine. This matter arose out of a labor dispute between the Company and the United Steelworkers Union over the terms of a contract for certain employees at the mine. These employees initiated a strike that began on April 7, 2010, and ended on June 15, 2010. In September 2012, the U.S. National Labor Relations Board (the “NLRB”) issued a decision finding that the Company had committed unfair labor practices in connection with the labor dispute. Under the ruling, the Company is responsible for back pay to affected employees as a result of changes made in union work rules and past practices beginning April 1, 2010. In the fourth quarter of 2013, this ruling was upheld by an appeals court. As of December 31, 2016, the Company had recorded a reserve of $7.4 million in its consolidated financial statements related to expected payments, including interest, required to resolve the dispute. In March 2017, the Company reached a settlement with the United Steelworkers Union and the NLRB with respect to this matter. Under the terms of the agreement, the Company paid $7.7 million to the affected employees in the second quarter of 2017. As a result of the settlement, the Company recognized an immaterial loss in its consolidated financial statements in 2017. The Wisconsin Department of Agriculture, Trade and Consumer Protection (“DATCP”) has 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 directed the Company to conduct further investigations into the possible presence of agricultural chemicals in soil and ground water at the Kenosha plant. The Company has completed initial on-property investigations and has provided the findings to DATCP. A second series of sampling and analysis is underway. All investigations and mitigation activities to date, and any potential future remediation work, are being conducted under the Wisconsin Agricultural Chemical Cleanup Program (the “ACCP”), which would provide for reimbursement of some of the costs. The Company may seek participation by, or cost reimbursement from, other parties responsible for the presence of any agricultural chemicals found in soil and ground water at this site if the Company does not receive an acknowledgment of no further action and is required to conduct further investigation or remedial work that may not be eligible for reimbursement under the ACCP. The Company 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 6, the Company’s Brazilian subsidiaries are party to administrative tax proceedings and claims which totaled $17.6 million as of June 30, 2017 , 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 has assumed liabilities for labor-related matters in connection with the acquisition of Produquímica, which are primarily related to compensation, labor benefits and consequential tax claims and totaled $11.0 million as of June 30, 2017 . The Company believes the maximum exposure for these other labor matters totaled approximately $43 million as of June 30, 2017 . As discussed in Note 2, the contingencies are still preliminary as of June 30, 2017 . 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 proceeding 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	6 Months Ended
	Jun. 30, 2017
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 and magnesium chloride for use in road deicing and dust control, food processing, water softeners and agricultural and industrial applications. SOP crop nutrients, industrial-grade SOP, micronutrients and magnesium chloride for agricultural purposes are produced and marketed through the Plant Nutrition North America segment. The Plant Nutrition South America segment represents the results of Produquímica, which was acquired in October 2016. This segment operates two primary businesses in Brazil – agricultural productivity and chemical solutions. See Note 2 for a further discussion of the acquisition. 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. Produquímica also manufactures and markets specialty chemicals for the industrial chemical industry. The Company’s Plant Nutrition South America segment represents the results of the acquired Produquímica business. Segment information is as follows (in millions): Three Months Ended June 30, 2017 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Sales to external customers $ 109.0 $ 50.5 $ 66.1 $ 2.4 $ 228.0 Intersegment sales — 2.0 — (2.0 ) — Shipping and handling cost 29.7 6.9 4.0 — 40.6 Operating earnings (loss) 10.7 7.6 0.8 (13.1 ) 6.0 Depreciation, depletion and amortization 12.7 8.6 5.4 1.3 28.0 Total assets (as of end of period) 868.0 582.9 790.0 57.0 2,297.9 Three Months Ended June 30, 2016 Salt Plant Nutrition North America (b) Plant Corporate & Other (a) Total Sales to external customers $ 119.1 $ 47.8 $ — $ 2.6 $ 169.5 Intersegment sales — 1.9 — (1.9 ) — Shipping and handling cost 31.4 5.7 — — 37.1 Operating earnings (loss) 23.3 4.7 — (12.5 ) 15.5 Depreciation, depletion and amortization 11.3 8.4 — 1.3 21.0 Total assets (as of end of period) 899.1 702.7 — 54.8 1,656.6 Six Months Ended June 30, 2017 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Sales to external customers $ 383.8 $ 99.7 $ 127.4 $ 4.9 $ 615.8 Intersegment sales — 2.9 — (2.9 ) — Shipping and handling cost 112.7 13.6 8.0 — 134.3 Operating earnings (loss) 56.1 15.2 2.6 (26.5 ) 47.4 Depreciation, depletion and amortization 25.6 17.5 10.7 2.6 56.4 Six Months Ended June 30, 2016 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Sales to external customers $ 411.2 $ 98.9 $ — $ 5.1 $ 515.2 Intersegment sales — 2.1 — (2.1 ) — Shipping and handling cost 114.4 12.1 — — 126.5 Operating earnings (loss) 106.0 10.0 — (26.2 ) 89.8 Depreciation, depletion and amortization 22.0 16.3 — 2.6 40.9 (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. (b) In 2016, total assets for Plant Nutrition North America include the equity investment in Produquímica.

Stockholders' Equity and Equity

Stockholders' Equity and Equity Instruments	6 Months Ended
	Jun. 30, 2017
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 (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 (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. The inputs used to calculate fair value for options granted in 2017 are included in the table below: Fair value of options granted $9.54 Exercise price $68.00 Expected term (years) 4.5 Expected volatility 23.2% Dividend yield 3.5% Risk-free rate of return 1.8% RSUs Substantially all of the RSUs granted under the 2005 Plan and 2015 Plan vest after three years of service, entitling 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 Substantially all of the PSUs granted under the 2005 Plan and 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 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 performance 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. TSR PSUs and ROIC PSUs generally have a three -year performance period. 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 performance 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. This model uses historical stock prices to estimate expected volatility and the Company’s correlation to the Russell 3000 Index. The risk-free rate was determined using the same methodology as the option valuations as discussed above. The 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 six months ended June 30, 2017 , the Company reissued the following number of shares from treasury stock: 3,366 shares related to the exercise of stock options, 13,018 shares related to the release of RSUs which vested, 12,946 shares related to the release of PSUs which vested and 4,774 shares related to stock payments. The Company recognized a tax deficiency of $0.5 million from its equity compensation awards as an increase to income tax expense during the first six months of 2017 . During the first six months of 2017 and 2016 , the Company recorded $2.5 million and $2.6 million , respectively, of compensation expense pursuant to its stock-based compensation plans. No amounts have been capitalized. The following table summarizes stock-based compensation activity during the six months ended June 30, 2017 : Stock Options RSUs PSUs (a) Number Weighted-average exercise price Number Weighted-average fair value Number Weighted-average fair value Outstanding at December 31, 2016 442,755 $ 80.07 63,780 $ 80.25 89,011 $ 89.43 Granted 227,351 68.00 34,635 68.00 58,878 73.08 Exercised (b) (3,366 ) 76.03 — — — — Released from restriction (b) — — (13,018 ) 87.18 (12,946 ) 105.77 Cancelled/expired (53,664 ) 74.98 (8,129 ) 70.57 (16,069 ) 89.59 Outstanding at June 30, 2017 613,076 $ 76.06 77,268 $ 74.61 118,874 $ 79.53 (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. The final performance period for the 2014 PSU grant was completed in 2016. The Company cancelled 6,900 PSUs in 2017 related to the 2014 PSU grant. (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 cash flow hedges and foreign currency translation adjustments. The components of and changes in accumulated other comprehensive income (loss) (“AOCI”) as of and for the three and six months ended June 30, 2017 , and 2016 , are as follows (in millions): Three Months Ended June 30, 2017 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ 0.1 $ (3.6 ) $ (87.0 ) $ (90.5 ) Other comprehensive income (loss) before reclassifications (b) (0.4 ) — (6.6 ) (7.0 ) Amounts reclassified from accumulated other comprehensive loss — 0.1 — 0.1 Net current period other comprehensive income (loss) (0.4 ) 0.1 (6.6 ) (6.9 ) Ending balance $ (0.3 ) $ (3.5 ) $ (93.6 ) $ (97.4 ) Three Months Ended June 30, 2016 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (1.4 ) $ (3.7 ) $ (68.5 ) $ (73.6 ) Other comprehensive income (loss) before reclassifications (b) 0.7 — (3.3 ) (2.6 ) Amounts reclassified from accumulated other comprehensive loss 0.5 0.1 — 0.6 Net current period other comprehensive income (loss) 1.2 0.1 (3.3 ) (2.0 ) Ending balance $ (0.2 ) $ (3.6 ) $ (71.8 ) $ (75.6 ) Six Months Ended June 30, 2017 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ 0.6 $ (3.7 ) $ (101.8 ) $ (104.9 ) Other comprehensive income (loss) before reclassifications (b) (0.9 ) — 8.2 7.3 Amounts reclassified from accumulated other comprehensive loss — 0.2 — 0.2 Net current period other comprehensive income (loss) (0.9 ) 0.2 8.2 7.5 Ending balance $ (0.3 ) $ (3.5 ) $ (93.6 ) $ (97.4 ) Six Months Ended June 30, 2016 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (1.6 ) $ (3.8 ) $ (102.9 ) $ (108.3 ) Other comprehensive income (loss) before reclassifications (b) 0.2 — 31.1 31.3 Amounts reclassified from accumulated other comprehensive loss 1.2 0.2 — 1.4 Net current period other comprehensive income (loss) 1.4 0.2 31.1 32.7 Ending balance $ (0.2 ) $ (3.6 ) $ (71.8 ) $ (75.6 ) (a) With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the tables above are reflected net of applicable income taxes. (b) The Company recorded foreign exchange losses (gains) of $8.6 million and $1.4 million in the three and six months ended June 30, 2017 , respectively, and $(4.9) million and $(26.7) million in the three and six months ended June 30, 2016 , respectively, in accumulated other comprehensive loss related to intercompany notes which were deemed to be of long-term investment nature. The amounts reclassified from AOCI to (income) expense for the three and six months ended June 30, 2017 , and 2016 , are shown below (in millions): Amount Reclassified from AOCI Three Months Ended Six Months Ended Line Item Impacted in the Consolidated Statement of Operations Gains and (losses) on cash flow hedges: Natural gas instruments $ — $ — Product cost — — Income tax expense (benefit) Reclassifications, net of income taxes — — Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.2 Product cost — — Income tax expense (benefit) Reclassifications, net of income taxes 0.1 0.2 Total reclassifications, net of income taxes $ 0.1 $ 0.2 Amount Reclassified from AOCI Three Months Ended Six Months Ended Line Item Impacted in the Consolidated Statement of Operations Gains and (losses) on cash flow hedges: Natural gas instruments $ 0.8 $ 1.9 Product cost (0.3 ) (0.7 ) Income tax expense (benefit) Reclassifications, net of income taxes 0.5 1.2 Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.2 Product cost — — Income tax expense (benefit) Reclassifications, net of income taxes 0.1 0.2 Total reclassifications, net of income taxes $ 0.6 $ 1.4

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments: The Company is subject to various types of market risks, including interest rate risk, foreign currency exchange rate transaction and translation risk and commodity pricing risk. Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments. Currently, the Company manages a portion of its commodity pricing risk by using derivative instruments. The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangement. The Company has entered into natural gas derivative instruments and foreign currency swaps 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 these counterparties.The Company records derivative financial instruments as either assets or liabilities at fair value in the consolidated balance sheets. Derivatives Designated as Hedging Instruments As of June 30, 2017 , the Company has entered into natural gas derivative instruments. Derivatives qualify for treatment as hedges when there is a high correlation between the change in fair value of the derivative instrument and the related change in value of the underlying hedged item. Depending on the exposure being hedged, the Company must designate the hedging instrument as a fair value hedge, a cash flow hedge or a net investment in foreign operations hedge. All natural gas derivative instruments held by the Company as of June 30, 2017 , and December 31, 2016 , qualified as cash flow hedges. For these qualifying hedges, the effective portion of the change in fair value is recognized through earnings when the underlying transaction being hedged affects earnings, allowing a derivative’s gains and losses to offset related results from the hedged item in the statements of operations. Any ineffectiveness related to these hedges was not material for any of the periods presented. Natural gas is consumed at several of the Company’s production facilities, and a change in natural gas prices impacts the Company’s operating margin. As of June 30, 2017 , the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through December 2018 . 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 June 30, 2017 , and December 31, 2016 , the Company had agreements in place to hedge forecasted natural gas purchases of 1.7 million and 2.3 million MMBtus, respectively. As of June 30, 2017 , 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. Derivatives Not Designated as Hedging Instruments In conjunction with the acquisition of Produquímica, the Company assumed U.S. dollar-denominated debt which was previously held by Produquímica. Prior to the acquisition, Produquímica entered into foreign currency swap agreements whereby Produquímica agreed to swap interest and principal payments on the loans denominated in U.S. dollars for principal and interest payments denominated in Brazilian Reais, Produquímica’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 Produquímica’s functional currency. The Company may either continue to economically hedge this exposure or borrow in Brazilian Reais to meet the capital needs of the Company’s Brazilian operations. As of June 30, 2017 , and December 31, 2016 , the Company had swap contracts in place to hedge $72.9 million and $119.6 million , respectively, of loans denominated in foreign currencies. The foreign currency swaps derivative instruments are not designated as hedges. For derivative instruments that are not accounted for as hedges, the change in fair value is recorded through earnings in the period of change. During the three and six months ended June 30, 2017 , the Company recognized gains (losses) of $2.8 million and $(5.3) million , respectively, in interest expense in its consolidated statement of operations for the change in fair value of the swap contracts. The following tables present the fair value of the Company’s hedged items as of June 30, 2017 , and December 31, 2016 (in millions): Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Balance Sheet Location June 30, 2017 Balance Sheet Location June 30, 2017 Commodity contracts Other current assets $ 0.1 Accrued expenses $ 0.5 Commodity contracts Other assets — Other noncurrent liabilities 0.1 Total derivatives designated as hedging instruments (a) 0.1 0.6 Derivatives not designated as hedging instruments: Swap contracts Other current assets $ — Accrued expenses $ 13.8 Swap contracts Other assets — Other noncurrent liabilities — Total derivatives not designated as hedging instruments — 13.8 Total Derivatives (b) $ 0.1 $ 14.4 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its consolidated balance sheets approximately $0.1 million of its commodity contracts that are in receivable positions against its contracts in payable positions. (b) The Company has commodity hedge and foreign currency swap agreements with two and five counterparties, respectively. Amounts recorded as assets for the Company’s commodity contracts are receivable from both counterparties, and the amounts recorded as liabilities for the Company’s commodity contracts are payable to one counterparty. The amounts recorded as liabilities for the Company’s swap contracts are payable to all five counterparties. Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Balance Sheet Location December 31, 2016 Balance Sheet Location December 31, 2016 Commodity contracts Other current assets $ 1.2 Accrued expenses $ 0.3 Commodity contracts Other assets 0.1 Other noncurrent liabilities 0.1 Total derivatives designated as hedging instruments (a) 1.3 0.4 Derivatives not designated as hedging instruments: Swap contracts Other current assets $ — Accrued expenses $ 25.8 Swap contracts Other assets — Other noncurrent liabilities — Total derivatives not designated as hedging instruments — 25.8 Total Derivatives (b) $ 1.3 $ 26.2 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its consolidated balance sheets approximately $0.4 million of its commodity contracts that are in a payable position against its contracts in receivable positions. (b) The Company has commodity hedge and foreign currency swap agreements with two and five counterparties, respectively. Amounts recorded as assets for the Company’s commodity contracts are receivable from both counterparties, and amounts recorded as liabilities for the Company’s swap contracts are payable to all five counterparties.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements: The Company’s financial instruments are measured and reported at their estimated fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction. When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (Level 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) other than those described in Note 2. 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 also held short-term investments which were classified as trading securities with any gains or losses recognized through earnings. The Company sold these investments during the first quarter of 2017. 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 11). The fair value of the natural gas derivative instruments and the foreign currency swaps 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): June 30, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified retirement plan (a) $ 2.0 $ 2.0 $ — $ — Derivatives – natural gas instruments, net — — — — Total Assets $ 2.0 $ 2.0 $ — $ — Liability Class: Liabilities related to non-qualified retirement plan $ (2.0 ) $ (2.0 ) $ — $ — Derivatives – natural gas instruments, net (0.5 ) — (0.5 ) — Derivatives – foreign currency swaps (13.8 ) — (13.8 ) — Total Liabilities $ (16.3 ) $ (2.0 ) $ (14.3 ) $ — (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, 10% in bond funds, 25% in short-term investments and 20% 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 – natural gas instruments 0.9 — 0.9 — Trading securities 1.8 — 1.8 — Total Assets $ 4.5 $ 1.8 $ 2.7 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.8 ) $ (1.8 ) $ — $ — Derivatives – foreign currency swaps (25.8 ) — (25.8 ) — Total Liabilities $ (27.6 ) $ (1.8 ) $ (25.8 ) $ — (a) Includes mutual fund investments of approximately 25% in the common stock of large-cap U.S. companies, 10% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 5% in bond funds, 40% in short-term investments and 15% in blended funds. Cash and cash equivalents, accounts receivable (net of allowance for bad debts) and payables are carried at cost, which approximates fair value due to their liquid and short-term nature. The Company’s investments related to its nonqualified retirement plan of $2.0 million and $1.8 million at June 30, 2017 , and December 31, 2016 , respectively, are stated at fair value based on quoted market prices. As of June 30, 2017 , 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, totaled $247.2 million (Level 2) compared with the aggregate principal amount at maturity of $250.0 million . The estimated amount a third-party would pay at June 30, 2017 , 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, totaled $912.2 million (Level 2) compared with the aggregate principal balance of $924.7 million . The loans assumed in the Produquímica acquisition had floating rates and their fair value approximates their carrying value.

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2017
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 Six Months Ended 2017 2016 2017 2016 Numerator: Net (loss) earnings $ (6.4 ) $ 6.3 $ 15.1 $ 56.0 Less: net (loss) earnings allocated to participating securities (a) (0.1 ) (0.1 ) (0.2 ) (0.3 ) Net earnings available to common shareholders $ (6.5 ) $ 6.2 $ 14.9 $ 55.7 Denominator (in thousands): Weighted-average common shares outstanding, shares for basic earnings per share 33,823 33,784 33,813 33,766 Weighted-average awards outstanding (b) — 3 — 3 Shares for diluted earnings per share 33,823 33,787 33,813 33,769 Net earnings per common share, basic $ (0.19 ) $ 0.18 $ 0.44 $ 1.65 Net earnings per common share, diluted $ (0.19 ) $ 0.18 $ 0.44 $ 1.65 (a) Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consist of 169,000 and 163,000 weighted participating securities for the three and six months ended June 30, 2017 , respectively, and 146,000 and 149,000 weighted participating securities for the three and six months ended June 30, 2016 , 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 728,000 and 609,000 weighted-average equity awards outstanding for the three and six months ended June 30, 2017 , respectively, and 580,000 and 491,000 weighted-average equity awards outstanding for the three and six months ended June 30, 2016 , respectively, which were anti-dilutive and therefore not included in the diluted earnings per share calculation.

Subsequent Event

Subsequent Event	6 Months Ended
	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event: In July 2017, the Company initiated a restructuring plan to reduce ongoing costs, which is expected to result in a charge of approximately $4 million in the third quarter of 2017.

Accounting Policies and Basis23

Accounting Policies and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2017
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 (“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, 2016 , as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring accruals considered necessary for a fair presentation, have been included.
Recent Accounting Pronouncements	In January 2017, the Financial Accounting Standards Board (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 will remain 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 plans to early adopt the guidance for its 2017 impairment testing. In August 2016, the FASB issued guidance to clarify how certain cash receipts and payments should be presented and classified in the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the timing of adoption of this guidance and the impact of the adoption of this guidance 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 of the adoption of this guidance on its consolidated financial statements. In March 2016, the FASB issued guidance to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The Company adopted this guidance in the first quarter of 2017 on a prospective basis, and prior periods have not been adjusted. The Company elected the option available under the new guidance to continue to estimate the effect of forfeitures in the calculation of share-based payment expense. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. 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. Under this guidance, an entity must also recognize a lease liability which represents a lessee’s obligation to make lease payments for the right to use the asset. In addition, the standard requires expanded qualitative and quantitative disclosures. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and requires a modified retrospective transition method. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. In July 2015, the FASB issued guidance that requires entities to measure inventory within the scope of the standard at the lower of cost or net realizable value. “Net realizable value” is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company adopted this guidance in the first quarter of 2017. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers. The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those years, and early adoption is permitted. The guidance permits the use of either a full or modified retrospective transition method. The Company expects to use the modified retrospective transition method. While the Company has not identified any material differences in the amount and timing of revenue recognition for the revenue streams management has reviewed thus far, the Company is still evaluating the impact of this guidance and it has not concluded on the overall impact of adopting this guidance. Adoption of this guidance will significantly impact the Company’s financial statement disclosures regarding revenue.
Derivative Financial Instruments	The Company is subject to various types of market risks, including interest rate risk, foreign currency exchange rate transaction and translation risk and commodity pricing risk. Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments. Currently, the Company manages a portion of its commodity pricing risk by using derivative instruments. The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangement. The Company has entered into natural gas derivative instruments and foreign currency swaps 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 these counterparties.The Company records derivative financial instruments as either assets or liabilities at fair value in the consolidated balance sheets.
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.

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Schedule of consideration transferred	A summary of the acquisition-date fair value of the consideration transferred is presented in the table below: Fair Value of Consideration Transferred (in millions) October 3, 2016 Cash paid at closing $ 317.1 Additional cash due at closing 20.6 Fair value of contingent consideration 31.4 Fair value of 35% equity investment 178.7 Total $ 547.8
Schedule of recognized amounts of identifiable assets acquired and liabilities assumed	Based upon the final purchase price and the updated preliminary valuation, the purchase price allocation, which is still subject to change based on the Company’s final analysis, is presented in the table below: Recognized amounts of identifiable assets acquired and liabilities assumed: Purchase Price Allocation Cash and cash equivalents $ 73.8 Accounts receivable 89.4 Inventory 77.1 Other current assets 13.7 Property, plant and equipment 189.4 Identified intangible assets 81.2 Investment in equity method investee 24.5 Other noncurrent assets 6.9 Accounts payable (27.1 ) Accrued expenses (40.3 ) Current portion of long-term debt (129.6 ) Other current liabilities (14.0 ) Long-term debt, net of current portion (62.0 ) Deferred income taxes, net (66.0 ) Other noncurrent liabilities (21.9 ) Total identifiable net assets 195.1 Goodwill 352.7 Total fair value of business combination $ 547.8
Schedule of identifiable intangible assets acquired	The estimated fair values and weighted average amortization period of the identifiable intangible assets are presented in the table below: Estimated Fair Value (in millions) Weighted-Average Amortization Period (in years) Trade names $ 36.9 11.0 Developed technology 37.5 5.3 Customer relationships 6.8 13.5 Total identifiable intangible assets $ 81.2 8.6
Schedule of unaudited combined pro forma results of operations	The following table presents combined unaudited pro forma results for the three and six months ended June 30, 2016. The pro forma financial information combines the historical results of operations for Produquímica and Compass Minerals as though the acquisition occurred on January 1, 2015. The pro forma information does not purport to represent the actual results of operations that Produquímica and Compass Minerals would have achieved had the companies been combined during the periods presented nor is the information intended to project the future results of operations. Certain adjustments to Produquímica’s historical results have been made to conform to U.S. GAAP and amounts have been translated to U.S. dollars. Unaudited Combined Pro Forma Results of Operations (in millions) Three Months Ended Six Months Ended Revenues $ 241.3 $ 648.3 Net income 6.2 50.2

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories consist of the following (in millions): June 30, December 31, Finished goods $ 208.1 $ 206.1 Raw materials and supplies 79.8 74.5 Total inventories $ 287.9 $ 280.6

Property, Plant and Equipment26

Property, Plant and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2017
Property, Plant and Equipment [Abstract]
Property, plant and equipment	Property, plant and equipment, net, consists of the following (in millions): June 30, December 31, Land, buildings and structures, and leasehold improvements $ 490.8 $ 480.1 Machinery and equipment 879.3 848.2 Office furniture and equipment 29.3 28.3 Mineral interests 170.7 168.5 Construction in progress 281.2 243.6 1,851.3 1,768.7 Less accumulated depreciation and depletion (734.5 ) (676.4 ) Property, plant and equipment, net $ 1,116.8 $ 1,092.3

Long-term Debt (Tables)

Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Long-term debt	Long-term debt consists of the following (in millions): June 30, December 31, Term Loans due July 2021 $ 841.6 $ 845.9 Revolving Credit Facility due July 2021 83.1 105.4 4.875% Senior Notes due July 2024 250.0 250.0 Banco Bradesco Loan due February 2017 — 13.2 Banco Votorantim Loan due April 2017 — 12.4 Banco Bradesco Loan due July 2017 — 4.8 Scotiabank Loan due August 2017 — 20.2 Banco Itaú Loans due September 2017 15.8 15.1 Scotiabank Loan due September 2017 15.0 15.1 Banco Votorantim Loan due September 2017 — 0.8 Banco Bradesco Loan due October 2017 17.0 16.8 Rabobank Loan due November 2017 22.3 22.6 Banco Itaú Loans due May 2019 to April 2020 2.4 3.1 Banco do Brasil Loan due November 2017 0.5 — Financiadora de Estudos e Projetos Loan due November 2023 13.5 7.4 Banco do Brasil Loan due September 2017 0.1 — Banco do Brasil Loan due October 2017 0.3 — Banco Safra Loan due September 2017 0.8 — Banco do Brasil Loan due February 2018 0.2 — 1,262.6 1,332.8 Less unamortized debt issuance costs (7.0 ) (7.8 ) Total Debt 1,255.6 1,325.0 Less current portion (82.8 ) (130.2 ) Long-term debt $ 1,172.8 $ 1,194.8

Operating Segments (Tables)

Operating Segments (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment information	Segment information is as follows (in millions): Three Months Ended June 30, 2017 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Sales to external customers $ 109.0 $ 50.5 $ 66.1 $ 2.4 $ 228.0 Intersegment sales — 2.0 — (2.0 ) — Shipping and handling cost 29.7 6.9 4.0 — 40.6 Operating earnings (loss) 10.7 7.6 0.8 (13.1 ) 6.0 Depreciation, depletion and amortization 12.7 8.6 5.4 1.3 28.0 Total assets (as of end of period) 868.0 582.9 790.0 57.0 2,297.9 Three Months Ended June 30, 2016 Salt Plant Nutrition North America (b) Plant Corporate & Other (a) Total Sales to external customers $ 119.1 $ 47.8 $ — $ 2.6 $ 169.5 Intersegment sales — 1.9 — (1.9 ) — Shipping and handling cost 31.4 5.7 — — 37.1 Operating earnings (loss) 23.3 4.7 — (12.5 ) 15.5 Depreciation, depletion and amortization 11.3 8.4 — 1.3 21.0 Total assets (as of end of period) 899.1 702.7 — 54.8 1,656.6 Six Months Ended June 30, 2017 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Sales to external customers $ 383.8 $ 99.7 $ 127.4 $ 4.9 $ 615.8 Intersegment sales — 2.9 — (2.9 ) — Shipping and handling cost 112.7 13.6 8.0 — 134.3 Operating earnings (loss) 56.1 15.2 2.6 (26.5 ) 47.4 Depreciation, depletion and amortization 25.6 17.5 10.7 2.6 56.4 Six Months Ended June 30, 2016 Salt Plant Nutrition North America Plant Corporate & Other (a) Total Sales to external customers $ 411.2 $ 98.9 $ — $ 5.1 $ 515.2 Intersegment sales — 2.1 — (2.1 ) — Shipping and handling cost 114.4 12.1 — — 126.5 Operating earnings (loss) 106.0 10.0 — (26.2 ) 89.8 Depreciation, depletion and amortization 22.0 16.3 — 2.6 40.9 (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. (b) In 2016, total assets for Plant Nutrition North America include the equity investment in Produquímica.

Stockholders' Equity and Equi29

Stockholders' Equity and Equity Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Stock options valuation assumptions	The inputs used to calculate fair value for options granted in 2017 are included in the table below: Fair value of options granted $9.54 Exercise price $68.00 Expected term (years) 4.5 Expected volatility 23.2% Dividend yield 3.5% Risk-free rate of return 1.8%
Stock-based compensation activity	The following table summarizes stock-based compensation activity during the six months ended June 30, 2017 : Stock Options RSUs PSUs (a) Number Weighted-average exercise price Number Weighted-average fair value Number Weighted-average fair value Outstanding at December 31, 2016 442,755 $ 80.07 63,780 $ 80.25 89,011 $ 89.43 Granted 227,351 68.00 34,635 68.00 58,878 73.08 Exercised (b) (3,366 ) 76.03 — — — — Released from restriction (b) — — (13,018 ) 87.18 (12,946 ) 105.77 Cancelled/expired (53,664 ) 74.98 (8,129 ) 70.57 (16,069 ) 89.59 Outstanding at June 30, 2017 613,076 $ 76.06 77,268 $ 74.61 118,874 $ 79.53 (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. The final performance period for the 2014 PSU grant was completed in 2016. The Company cancelled 6,900 PSUs in 2017 related to the 2014 PSU grant. (b) Common stock issued for exercised options and for vested and earned RSUs and PSUs was issued from treasury stock.
Components of and changes in accumulated other comprehensive income	The components of and changes in accumulated other comprehensive income (loss) (“AOCI”) as of and for the three and six months ended June 30, 2017 , and 2016 , are as follows (in millions): Three Months Ended June 30, 2017 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ 0.1 $ (3.6 ) $ (87.0 ) $ (90.5 ) Other comprehensive income (loss) before reclassifications (b) (0.4 ) — (6.6 ) (7.0 ) Amounts reclassified from accumulated other comprehensive loss — 0.1 — 0.1 Net current period other comprehensive income (loss) (0.4 ) 0.1 (6.6 ) (6.9 ) Ending balance $ (0.3 ) $ (3.5 ) $ (93.6 ) $ (97.4 ) Three Months Ended June 30, 2016 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (1.4 ) $ (3.7 ) $ (68.5 ) $ (73.6 ) Other comprehensive income (loss) before reclassifications (b) 0.7 — (3.3 ) (2.6 ) Amounts reclassified from accumulated other comprehensive loss 0.5 0.1 — 0.6 Net current period other comprehensive income (loss) 1.2 0.1 (3.3 ) (2.0 ) Ending balance $ (0.2 ) $ (3.6 ) $ (71.8 ) $ (75.6 ) Six Months Ended June 30, 2017 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ 0.6 $ (3.7 ) $ (101.8 ) $ (104.9 ) Other comprehensive income (loss) before reclassifications (b) (0.9 ) — 8.2 7.3 Amounts reclassified from accumulated other comprehensive loss — 0.2 — 0.2 Net current period other comprehensive income (loss) (0.9 ) 0.2 8.2 7.5 Ending balance $ (0.3 ) $ (3.5 ) $ (93.6 ) $ (97.4 ) Six Months Ended June 30, 2016 (a) Gains and (Losses) on Cash Flow Hedges Defined Benefit Pension Foreign Currency Total Beginning balance $ (1.6 ) $ (3.8 ) $ (102.9 ) $ (108.3 ) Other comprehensive income (loss) before reclassifications (b) 0.2 — 31.1 31.3 Amounts reclassified from accumulated other comprehensive loss 1.2 0.2 — 1.4 Net current period other comprehensive income (loss) 1.4 0.2 31.1 32.7 Ending balance $ (0.2 ) $ (3.6 ) $ (71.8 ) $ (75.6 ) (a) With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the tables above are reflected net of applicable income taxes. (b) The Company recorded foreign exchange losses (gains) of $8.6 million and $1.4 million in the three and six months ended June 30, 2017 , respectively, and $(4.9) million and $(26.7) million in the three and six months ended June 30, 2016 , respectively, in accumulated other comprehensive loss related to intercompany notes which were deemed to be of long-term investment nature.
Reclassifications out of accumulated other comprehensive income	The amounts reclassified from AOCI to (income) expense for the three and six months ended June 30, 2017 , and 2016 , are shown below (in millions): Amount Reclassified from AOCI Three Months Ended Six Months Ended Line Item Impacted in the Consolidated Statement of Operations Gains and (losses) on cash flow hedges: Natural gas instruments $ — $ — Product cost — — Income tax expense (benefit) Reclassifications, net of income taxes — — Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.2 Product cost — — Income tax expense (benefit) Reclassifications, net of income taxes 0.1 0.2 Total reclassifications, net of income taxes $ 0.1 $ 0.2 Amount Reclassified from AOCI Three Months Ended Six Months Ended Line Item Impacted in the Consolidated Statement of Operations Gains and (losses) on cash flow hedges: Natural gas instruments $ 0.8 $ 1.9 Product cost (0.3 ) (0.7 ) Income tax expense (benefit) Reclassifications, net of income taxes 0.5 1.2 Amortization of defined benefit pension: Amortization of loss $ 0.1 $ 0.2 Product cost — — Income tax expense (benefit) Reclassifications, net of income taxes 0.1 0.2 Total reclassifications, net of income taxes $ 0.6 $ 1.4

Derivative Financial Instrume30

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value of hedged items	The following tables present the fair value of the Company’s hedged items as of June 30, 2017 , and December 31, 2016 (in millions): Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Balance Sheet Location June 30, 2017 Balance Sheet Location June 30, 2017 Commodity contracts Other current assets $ 0.1 Accrued expenses $ 0.5 Commodity contracts Other assets — Other noncurrent liabilities 0.1 Total derivatives designated as hedging instruments (a) 0.1 0.6 Derivatives not designated as hedging instruments: Swap contracts Other current assets $ — Accrued expenses $ 13.8 Swap contracts Other assets — Other noncurrent liabilities — Total derivatives not designated as hedging instruments — 13.8 Total Derivatives (b) $ 0.1 $ 14.4 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its consolidated balance sheets approximately $0.1 million of its commodity contracts that are in receivable positions against its contracts in payable positions. (b) The Company has commodity hedge and foreign currency swap agreements with two and five counterparties, respectively. Amounts recorded as assets for the Company’s commodity contracts are receivable from both counterparties, and the amounts recorded as liabilities for the Company’s commodity contracts are payable to one counterparty. The amounts recorded as liabilities for the Company’s swap contracts are payable to all five counterparties. Asset Derivatives Liability Derivatives Derivatives designated as hedging instruments: Balance Sheet Location December 31, 2016 Balance Sheet Location December 31, 2016 Commodity contracts Other current assets $ 1.2 Accrued expenses $ 0.3 Commodity contracts Other assets 0.1 Other noncurrent liabilities 0.1 Total derivatives designated as hedging instruments (a) 1.3 0.4 Derivatives not designated as hedging instruments: Swap contracts Other current assets $ — Accrued expenses $ 25.8 Swap contracts Other assets — Other noncurrent liabilities — Total derivatives not designated as hedging instruments — 25.8 Total Derivatives (b) $ 1.3 $ 26.2 (a) The Company has master netting agreements with its commodity hedge counterparties and accordingly has netted in its consolidated balance sheets approximately $0.4 million of its commodity contracts that are in a payable position against its contracts in receivable positions. (b) The Company has commodity hedge and foreign currency swap agreements with two and five counterparties, respectively. Amounts recorded as assets for the Company’s commodity contracts are receivable from both counterparties, and amounts recorded as liabilities for the Company’s swap contracts are payable to all five counterparties.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair value measurements	The estimated fair values for each type of instrument are presented below (in millions): June 30, Level One Level Two Level Three Asset Class: Mutual fund investments in a non-qualified retirement plan (a) $ 2.0 $ 2.0 $ — $ — Derivatives – natural gas instruments, net — — — — Total Assets $ 2.0 $ 2.0 $ — $ — Liability Class: Liabilities related to non-qualified retirement plan $ (2.0 ) $ (2.0 ) $ — $ — Derivatives – natural gas instruments, net (0.5 ) — (0.5 ) — Derivatives – foreign currency swaps (13.8 ) — (13.8 ) — Total Liabilities $ (16.3 ) $ (2.0 ) $ (14.3 ) $ — (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, 10% in bond funds, 25% in short-term investments and 20% 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 – natural gas instruments 0.9 — 0.9 — Trading securities 1.8 — 1.8 — Total Assets $ 4.5 $ 1.8 $ 2.7 $ — Liability Class: Liabilities related to non-qualified savings plan $ (1.8 ) $ (1.8 ) $ — $ — Derivatives – foreign currency swaps (25.8 ) — (25.8 ) — Total Liabilities $ (27.6 ) $ (1.8 ) $ (25.8 ) $ — (a) Includes mutual fund investments of approximately 25% in the common stock of large-cap U.S. companies, 10% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 5% in bond funds, 40% in short-term investments and 15% in blended funds.

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Computation of basic and diluted earnings per common share	The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data): Three months ended Six Months Ended 2017 2016 2017 2016 Numerator: Net (loss) earnings $ (6.4 ) $ 6.3 $ 15.1 $ 56.0 Less: net (loss) earnings allocated to participating securities (a) (0.1 ) (0.1 ) (0.2 ) (0.3 ) Net earnings available to common shareholders $ (6.5 ) $ 6.2 $ 14.9 $ 55.7 Denominator (in thousands): Weighted-average common shares outstanding, shares for basic earnings per share 33,823 33,784 33,813 33,766 Weighted-average awards outstanding (b) — 3 — 3 Shares for diluted earnings per share 33,823 33,787 33,813 33,769 Net earnings per common share, basic $ (0.19 ) $ 0.18 $ 0.44 $ 1.65 Net earnings per common share, diluted $ (0.19 ) $ 0.18 $ 0.44 $ 1.65 (a) Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consist of 169,000 and 163,000 weighted participating securities for the three and six months ended June 30, 2017 , respectively, and 146,000 and 149,000 weighted participating securities for the three and six months ended June 30, 2016 , 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 728,000 and 609,000 weighted-average equity awards outstanding for the three and six months ended June 30, 2017 , respectively, and 580,000 and 491,000 weighted-average equity awards outstanding for the three and six months ended June 30, 2016 , respectively, which were anti-dilutive and therefore not included in the diluted earnings per share calculation.

Accounting Policies and Basis33

Accounting Policies and Basis of Presentation - Additional Information (Details) - Business	Oct. 03, 2016	Oct. 31, 2016
Produquímica [Member]
Business Acquisition [Line Items]
Number of primary businesses	2	2

Acquisition - Additional Inform

Acquisition - Additional Information (Details) BRL in Millions	Oct. 03, 2016USD ($)Business	Dec. 23, 2015BRL	Dec. 23, 2015USD ($)	Oct. 31, 2016Business	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Aggregate purchase price								$ 0	$ 4,700,000
Gain on settlement of acquisition-related contingent consideration								1,900,000	$ 0
Goodwill						$ 412,200,000		403,200,000
Plant Nutrition South America [Member]
Business Acquisition [Line Items]
Goodwill						352,800,000		341,900,000
New Tranche Term Loans Due July 2021 [Member] | Secured Debt [Member]
Business Acquisition [Line Items]
Face amount										$ 450,000,000
Produquímica [Member]
Business Acquisition [Line Items]
Interest acquired	65.00%
Fair value of contingent consideration	$ 31,400,000
Percentage of equity interest prior to acquisition	35.00%
Fair value of equity interest prior to acquisition	$ 178,700,000
Gain from remeasurement of equity method investment						$ 59,300,000
Decrease in goodwill								3,600,000
Decrease in other noncurrent liabilities								4,400,000
Increase to net deferred income taxes								800,000
Goodwill	352,700,000
Revenue								127,400,000
Net losses								$ 8,800,000
Produquímica [Member] | Plant Nutrition South America [Member]
Business Acquisition [Line Items]
Gain on settlement of acquisition-related contingent consideration					$ 1,900,000
Goodwill	$ 352,700,000
Produquímica [Member]
Business Acquisition [Line Items]
Ownership interest in investment		35.00%	35.00%
Aggregate purchase price		BRL 452.4	$ 114,100,000				$ 4,700,000
Number of primary businesses | Business	2			2
Produquímica [Member] | Term Loan due May 2017 [Member] | Term Loan [Member]
Business Acquisition [Line Items]
Face amount											$ 100,000,000

Acquisition - Fair Value of Con

Acquisition - Fair Value of Consideration Transferred (Details) - Produquímica [Member] $ in Millions	Oct. 03, 2016USD ($)
Business Acquisition [Line Items]
Cash paid at closing	$ 317.1
Additional cash due at closing	20.6
Fair value of contingent consideration	31.4
Fair value of 35% equity investment	178.7
Total	$ 547.8
Equity method investment ownership interest	35.00%

Acquisition - Assets Acquired a

Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Oct. 03, 2016
Business Acquisition [Line Items]
Goodwill	$ 403.2	$ 412.2
Produquímica [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 73.8
Accounts receivable			89.4
Inventory			77.1
Other current assets			13.7
Property, plant and equipment			189.4
Identified intangible assets			81.2
Investment in equity method investee			24.5
Other noncurrent assets			6.9
Accounts payable			(27.1)
Accrued expenses			(40.3)
Current portion of long-term debt			(129.6)
Other current liabilities			(14)
Long-term debt, net of current portion			(62)
Deferred income taxes, net			(66)
Other noncurrent liabilities			(21.9)
Total identifiable net assets			195.1
Goodwill			352.7
Total fair value of business combination			$ 547.8

Acquisition - Identifiable Inta

Acquisition - Identifiable Intangible Assets Acquired (Details) - Produquímica [Member] $ in Millions	Oct. 03, 2016USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value (in millions)	$ 81.2
Weighted-Average Amortization Period (in years)	8 years 7 months 6 days
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value (in millions)	$ 36.9
Weighted-Average Amortization Period (in years)	11 years
Developed Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value (in millions)	$ 37.5
Weighted-Average Amortization Period (in years)	5 years 3 months 18 days
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated Fair Value (in millions)	$ 6.8
Weighted-Average Amortization Period (in years)	13 years 6 months

Acquisition - Unaudited Combine

Acquisition - Unaudited Combined Pro Forma Results of Operations (Details) - Produquímica [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Business Acquisition [Line Items]
Revenues	$ 241.3	$ 648.3
Net income	$ 6.2	$ 50.2

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 208.1	$ 206.1
Raw materials and supplies	79.8	74.5
Total inventories	$ 287.9	$ 280.6

Property, Plant and Equipment40

Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,851.3	$ 1,768.7
Less accumulated depreciation and depletion	(734.5)	(676.4)
Property, plant and equipment, net	1,116.8	1,092.3
Land, Buildings and Structures, and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	490.8	480.1
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	879.3	848.2
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	29.3	28.3
Mineral Interests [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	170.7	168.5
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 281.2	$ 243.6

Goodwill and Intangible Asset41

Goodwill and Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 4	$ 1.1	$ 8.1	$ 2.1
Goodwill [Line Items]
Goodwill	403.2		403.2		$ 412.2
Plant Nutrition, North America [Member]
Goodwill [Line Items]
Goodwill	55.3		55.3		53.6
Plant Nutrition South America [Member]
Goodwill [Line Items]
Goodwill	$ 341.9		$ 341.9		$ 352.8

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Foreign Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 61.6	$ 53.6
Foreign Federal 2033 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 9.2	7.5
Expiration date (beginning in 2033)	Dec. 31, 2033
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 1.1	$ 0.9
Expiration date (beginning in 2033)	Dec. 31, 2033
Canadian Provincial [Member]
Income Tax Examination [Line Items]
Total reassessments including interest	$ 99.8
Amount of security posted in the form of a performance bond	61.2
Amount of security posted in the form of cash	33.9
Amount of security payable	$ 4.7
Canadian Provincial [Member] | Minimum [Member]
Income Tax Examination [Line Items]
Years under examination	2,002
Canadian Provincial [Member] | Maximum [Member]
Income Tax Examination [Line Items]
Years under examination	2,012
Canadian Federal and Provincial [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Total reassessment amount including penalty and interest	$ 94.7
Canadian Federal and Provincial [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Amount of security posted in the form of a performance bond	9.8
Total reassessment amount including penalty and interest	35.7
Amount of security in the form of a bank letter guarantee	$ 10.1
Canadian Federal and Provincial [Member] | Minimum [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Years under examination	2,004
Canadian Federal and Provincial [Member] | Minimum [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Years under examination	2,007
Canadian Federal and Provincial [Member] | Maximum [Member] | Tax Year 2004 Through 2006 [Member]
Income Tax Examination [Line Items]
Years under examination	2,006
Canadian Federal and Provincial [Member] | Maximum [Member] | Tax Year 2007 Through 2008 [Member]
Income Tax Examination [Line Items]
Years under examination	2,008

Long-term Debt (Details)

Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,262.6	$ 1,332.8
Less unamortized debt issuance costs	(7)	(7.8)
Total Debt	1,255.6	1,325
Less current portion	(82.8)	(130.2)
Long-term debt	1,172.8	1,194.8
Banco Bradesco Due February 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0	13.2
Banco Votorantim Due April 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0	12.4
Banco Bradesco Due July 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0	4.8
Scotiabank Due August 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0	20.2
Banco Itau Due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	15.8	15.1
Scotiabank Due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	15	15.1
Banco Votorantim Due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0	0.8
Banco Bradesco Due October 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	17	16.8
Rabobank Due November 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	22.3	22.6
Banco Itau Due May 2019 To April 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	2.4	3.1
Banco Do Brasil Due November 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0.5	0
Financiadora de Estudos e Projetos Due November 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	13.5	7.4
Banco Do Brasil Due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0.1	0
Banco Do Brasil Due October 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0.3	0
Banco Safra Due September 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0.8	0
Banco Do Brazil due February 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	0.2	0
Revolving Credit Facility [Member] | Revolving Credit Facility Due July 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	83.1	105.4
Secured Debt [Member] | Term Loans Due July 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	841.6	845.9
Senior Notes [Member] | 4.875% Senior Notes due July 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 250	$ 250
Senior notes, interest rate	4.875%

Long-term Debt - Additional Inf

Long-term Debt - Additional Information (Details) - USD ($)	1 Months Ended		6 Months Ended
	Sep. 30, 2016	Apr. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Oct. 03, 2016
Debt Instrument [Line Items]
Gross debt issuance costs	$ 1,500,000	$ 4,400,000
Refinancing expense	700,000	1,400,000	$ 0	$ 1,500,000
Write-off of existing deferred financing costs		100,000
New Tranche Term Loans Due July 2021 [Member]
Debt Instrument [Line Items]
Gross debt issuance costs	$ 2,200,000
New Tranche Term Loans Due July 2021 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable interest rate	2.00%
Secured Credit Agreement Due July 2021 [Member]
Debt Instrument [Line Items]
Gross debt issuance costs		$ 5,800,000
Secured Credit Agreement Due July 2021 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable interest rate		1.75%
Revolving Credit Facility [Member] | Revolving Credit Facility due August 2017 [Member]
Debt Instrument [Line Items]
Debt refinanced		$ 125,000,000
Revolving Credit Facility [Member] | Secured Credit Agreement Due July 2021 [Member]
Debt Instrument [Line Items]
Face amount		300,000,000
Produquímica [Member]
Debt Instrument [Line Items]
Interest acquired					65.00%
Secured Debt [Member] | New Tranche Term Loans Due July 2021 [Member]
Debt Instrument [Line Items]
Face amount	$ 450,000,000
Secured Debt [Member] | Term Loans due May 2017 [Member]
Debt Instrument [Line Items]
Debt refinanced		471,000,000
Secured Debt [Member] | Secured Credit Agreement Due July 2021 [Member]
Debt Instrument [Line Items]
Face amount		$ 400,000,000

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Maximum exposure for other labor matters	$ 43	$ 43
Produquímica [Member]
Loss Contingencies [Line Items]
Contingent liabilities assumed	11	11
Cote Blanche [Member]
Loss Contingencies [Line Items]
Reserve for expected payments required to resolve the dispute			$ 7.4
Settlement amount	7.7
Loss on settlement		0
Brazilian Tax Litigation And Assessments [Member]
Loss Contingencies [Line Items]
Reserve for expected payments required to resolve the dispute	$ 17.6	$ 17.6

Operating Segments (Details)

Operating Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)Businesssegment	Jun. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Segment Reporting Information [Abstract]
Sales	$ 228	$ 169.5	$ 615.8	$ 515.2
Shipping and handling cost	40.6	37.1	134.3	126.5
Operating earnings (loss)	6	15.5	47.4	89.8
Depreciation, depletion and amortization	28	21	56.4	40.9
Total assets (as of end of period)	2,297.9	1,656.6	2,297.9	1,656.6	$ 2,466.5
Operating Segments [Member] | Salt [Member]
Segment Reporting Information [Abstract]
Sales	109	119.1	383.8	411.2
Shipping and handling cost	29.7	31.4	112.7	114.4
Operating earnings (loss)	10.7	23.3	56.1	106
Depreciation, depletion and amortization	12.7	11.3	25.6	22
Total assets (as of end of period)	868	899.1	868	899.1
Operating Segments [Member] | Plant Nutrition, North America [Member]
Segment Reporting Information [Abstract]
Sales	50.5	47.8	99.7	98.9
Shipping and handling cost	6.9	5.7	13.6	12.1
Operating earnings (loss)	7.6	4.7	15.2	10
Depreciation, depletion and amortization	8.6	8.4	17.5	16.3
Total assets (as of end of period)	582.9	702.7	$ 582.9	702.7
Operating Segments [Member] | Plant Nutrition South America [Member]
Segment Reporting Information [Line Items]
Number of primary businesses | Business			2
Segment Reporting Information [Abstract]
Sales	66.1	0	$ 127.4	0
Shipping and handling cost	4	0	8	0
Operating earnings (loss)	0.8	0	2.6	0
Depreciation, depletion and amortization	5.4	0	10.7	0
Total assets (as of end of period)	790	0	790	0
Corporate and Other [Member]
Segment Reporting Information [Abstract]
Sales	2.4	2.6	4.9	5.1
Shipping and handling cost	0	0	0	0
Operating earnings (loss)	(13.1)	(12.5)	(26.5)	(26.2)
Depreciation, depletion and amortization	1.3	1.3	2.6	2.6
Total assets (as of end of period)	57	54.8	57	54.8
Intersegment Sales [Member]
Segment Reporting Information [Abstract]
Sales	(2)	(1.9)	(2.9)	(2.1)
Intersegment Sales [Member] | Salt [Member]
Segment Reporting Information [Abstract]
Sales	0	0	0	0
Intersegment Sales [Member] | Plant Nutrition, North America [Member]
Segment Reporting Information [Abstract]
Sales	2	1.9	2.9	2.1
Intersegment Sales [Member] | Plant Nutrition South America [Member]
Segment Reporting Information [Abstract]
Sales	$ 0	$ 0	$ 0	$ 0

Stockholders' Equity and Equi47

Stockholders' Equity and Equity Instruments - Plan Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reissued shares of treasury stock (in shares)	4,774
Tax deficiency from equity compensation awards recorded as an increase to income tax expense	$ 0.5
Compensation expense recorded during period pursuant to stock-based compensation plans	$ 2.5	$ 2.6
Stock Options [Member]
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
Fair value measurement method	Black-Scholes option valuation model
Reissued shares of treasury stock (in shares)	3,366
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of shares available from conversion (in shares)	1
Service period	3 years
Reissued shares of treasury stock (in shares)	13,018
TSR PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs	3 years
TSR PSUs [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned (in hundredths)	0.00%
TSR PSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned (in hundredths)	150.00%
ROIC PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs	3 years
ROIC PSUs [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned (in hundredths)	0.00%
ROIC PSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares earned (in hundredths)	200.00%
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of PSUs	3 years
Reissued shares of treasury stock (in shares)	12,946
2015 Incentive Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance (in shares)			3,000,000

Stockholders' Equity and Equi48

Stockholders' Equity and Equity Instruments - Summary of Fair Value Assumptions and Methodology (Details) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2017$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of options granted (in dollars per share)	$ 9.54
Exercise price (in dollars per share)	$ 68
Expected term (years)	4 years 6 months
Expected volatility	23.20%
Dividend yield	3.50%
Risk-free rate of return	1.80%

Stockholders' Equity and Equi49

Stockholders' Equity and Equity Instruments - Activity (Details)	6 Months Ended
	Jun. 30, 2017$ / sharesshares
Stock Options [Member]
Number
Outstanding at beginning of period (in shares)	442,755
Granted (in shares)	227,351
Exercised (in shares)	(3,366)
Cancelled/Expired (in shares)	(53,664)
Outstanding at end of period (in shares)	613,076
Weighted-average exercise price
Weighted-average exercise price at beginning of period (in dollars per share) | $ / shares	$ 80.07
Weighted-average exercise price, Granted (in dollars per share) | $ / shares	68
Weighted-average exercise price, Exercised (in dollars per share) | $ / shares	76.03
Weighted-average exercise price, Cancelled/Expired (in dollars per share) | $ / shares	74.98
Weighted-average exercise price at end of period (in dollars per share) | $ / shares	$ 76.06
RSUs [Member]
Number
Outstanding at beginning of period (in shares)	63,780
Granted (in shares)	34,635
Released from restriction (in shares)	(13,018)
Cancelled/Expired (in shares)	(8,129)
Outstanding at end of period (in shares)	77,268
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) | $ / shares	$ 80.25
Weighted-average fair value, Granted (in dollars per share) | $ / shares	68
Weighted-average fair value, Released from restriction (in dollars per share) | $ / shares	87.18
Weighted-average fair value, Cancelled/Expired (in dollars per share) | $ / shares	70.57
Weighted-average fair value at end of period (in dollars per share) | $ / shares	$ 74.61
PSUs [Member]
Number
Outstanding at beginning of period (in shares)	89,011
Granted (in shares)	58,878
Released from restriction (in shares)	(12,946)
Cancelled/Expired (in shares)	(16,069)
Outstanding at end of period (in shares)	118,874
Weighted-average fair value
Weighted-average fair value at beginning of period (in dollars per share) | $ / shares	$ 89.43
Weighted-average fair value, Granted (in dollars per share) | $ / shares	73.08
Weighted-average fair value, Released from restriction (in dollars per share) | $ / shares	105.77
Weighted-average fair value, Cancelled/Expired (in dollars per share) | $ / shares	89.59
Weighted-average fair value at end of period (in dollars per share) | $ / shares	$ 79.53
PSU at grant date (in shares per unit)	1
PSUs [Member] | 2014 Grant [Member]
Number
Cancelled/Expired (in shares)	(6,900)

Stockholders' Equity and Equi50

Stockholders' Equity and Equity Instruments - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ 717.1
Ending balance	$ 693.7		693.7
Losses (gains) on foreign exchange of intercompany notes of long-term nature	8.6	$ (4.9)	1.4	$ (26.7)
Gains and (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0.1	(1.4)	0.6	(1.6)
Other comprehensive income (loss) before reclassifications	(0.4)	0.7	(0.9)	0.2
Amounts reclassified from accumulated other comprehensive loss	0	0.5	0	1.2
Net current period other comprehensive income (loss)	(0.4)	1.2	(0.9)	1.4
Ending balance	(0.3)	(0.2)	(0.3)	(0.2)
Defined Benefit Pension [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(3.6)	(3.7)	(3.7)	(3.8)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss	0.1	0.1	0.2	0.2
Net current period other comprehensive income (loss)	0.1	0.1	0.2	0.2
Ending balance	(3.5)	(3.6)	(3.5)	(3.6)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(87)	(68.5)	(101.8)	(102.9)
Other comprehensive income (loss) before reclassifications	(6.6)	(3.3)	8.2	31.1
Amounts reclassified from accumulated other comprehensive loss	0	0	0	0
Net current period other comprehensive income (loss)	(6.6)	(3.3)	8.2	31.1
Ending balance	(93.6)	(71.8)	(93.6)	(71.8)
Total [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(90.5)	(73.6)	(104.9)	(108.3)
Other comprehensive income (loss) before reclassifications	(7)	(2.6)	7.3	31.3
Amounts reclassified from accumulated other comprehensive loss	0.1	0.6	0.2	1.4
Net current period other comprehensive income (loss)	(6.9)	(2)	7.5	32.7
Ending balance	$ (97.4)	$ (75.6)	$ (97.4)	$ (75.6)

Stockholders' Equity and Equi51

Stockholders' Equity and Equity Instruments - Amount Reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	$ 142.5	$ 91.1	$ 355	$ 244.8
Income tax expense (benefit)	(1.5)	1	4.8	21
Gains and (losses) from cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of income taxes	0	(0.5)	0	(1.2)
Amortization of defined benefit pension [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of income taxes	(0.1)	(0.1)	(0.2)	(0.2)
Reclassifications, net of income taxes [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of income taxes	0.1	0.6	0.2	1.4
Reclassifications, net of income taxes [Member] | Gains and (losses) from cash flow hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0	0.8	0	1.9
Income tax expense (benefit)	0	(0.3)	0	(0.7)
Total reclassifications, net of income taxes	0	0.5	0	1.2
Reclassifications, net of income taxes [Member] | Amortization of defined benefit pension [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Product cost	0.1	0.1	0.2	0.2
Income tax expense (benefit)	0	0	0	0
Total reclassifications, net of income taxes	$ 0.1	$ 0.1	$ 0.2	$ 0.2

Derivative Financial Instrume52

Derivative Financial Instruments - Additional Information (Details) MMBTU in Millions, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2017USD ($)MMBTU	Dec. 31, 2016USD ($)MMBTU
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount (in MMBtus) | MMBTU		1.7	2.3
Net losses to be reclassified from accumulated other comprehensive loss to earnings during the next 12 months		$ 0.4
Commodity Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Underlying risk		change in natural gas prices
Percent of forecasted usage to be hedged (up to 90%)	90.00%	90.00%
Maximum period which the Company hedges in advance of forecasted purchase		36 months
Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Gain (loss) on changes in fair value of derivative instruments	$ 2.8	$ (5.3)
Swap Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Notional amount	$ 72.9	$ 72.9	$ 119.6

Derivative Financial Instrume53

Derivative Financial Instruments - Fair Value of Hedged Items (Details) $ in Millions	Jun. 30, 2017USD ($)counterparty	Dec. 31, 2016USD ($)counterparty
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0.1	$ 1.3
Liability Derivatives	14.4	26.2
Commodity Contracts [Member]
Derivatives, Fair Value [Line Items]
Netting of contracts in a receivable position against contracts in payable positions	$ 0.1
Netting of contracts in a payable position against contracts in receivable positions		$ 0.4
Number of counterparties | counterparty	2	2
Number of counterparties for amounts recorded as liabilities | counterparty	1
Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Number of counterparties | counterparty	5	5
Number of counterparties for amounts recorded as liabilities | counterparty	5	5
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 0.1	$ 1.3
Liability Derivatives	0.6	0.4
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0.1	1.2
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.5	0.3
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0.1
Derivatives Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	0.1	0.1
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Liability Derivatives	13.8	25.8
Derivatives Not Designated as Hedging Instruments [Member] | Swap Contracts [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Derivatives Not Designated as Hedging Instruments [Member] | Swap Contracts [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	13.8	25.8
Derivatives Not Designated as Hedging Instruments [Member] | Swap Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Derivatives Not Designated as Hedging Instruments [Member] | Swap Contracts [Member] | Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0	$ 0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Liability Class:
Mutual fund investments percentage of fund invested in common stock of large-cap U.S. (in hundredths)	25.00%	25.00%
Mutual fund investments percentage of fund invested in common stock of small cap to mid-cap (in hundredths)	15.00%	10.00%
Mutual fund investments percentage of fund invested in common stock of international companies (in hundredths)	5.00%	5.00%
Mutual fund investments percentage of fund invested in bond funds (in hundredths)	10.00%	5.00%
Mutual fund investments percentage of fund invested in short-term investments (in hundredths)	25.00%	40.00%
Mutual fund investments percentage of fund invested in blended funds (in hundredths)	20.00%	15.00%
Fair Value, Measurements, Recurring [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	$ 2,000,000	$ 1,800,000
Derivatives – natural gas instruments, net	0	900,000
Trading securities		1,800,000
Total Assets	2,000,000	4,500,000
Liability Class:
Liabilities related to non-qualified retirement plan	(2,000,000)	(1,800,000)
Derivatives – natural gas instruments, net	(500,000)
Derivatives – foreign currency swaps	(13,800,000)	(25,800,000)
Total Liabilities	(16,300,000)	(27,600,000)
Fair Value, Measurements, Recurring [Member] | Level One [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	2,000,000	1,800,000
Derivatives – natural gas instruments, net	0	0
Trading securities		0
Total Assets	2,000,000	1,800,000
Liability Class:
Liabilities related to non-qualified retirement plan	(2,000,000)	(1,800,000)
Derivatives – natural gas instruments, net	0
Derivatives – foreign currency swaps	0	0
Total Liabilities	(2,000,000)	(1,800,000)
Fair Value, Measurements, Recurring [Member] | Level Two [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	0	0
Derivatives – natural gas instruments, net	0	900,000
Trading securities		1,800,000
Total Assets	0	2,700,000
Liability Class:
Liabilities related to non-qualified retirement plan	0	0
Derivatives – natural gas instruments, net	(500,000)
Derivatives – foreign currency swaps	(13,800,000)	(25,800,000)
Total Liabilities	(14,300,000)	(25,800,000)
Fair Value, Measurements, Recurring [Member] | Level Three [Member]
Asset Class:
Mutual fund investments in a non-qualified retirement plan	0	0
Derivatives – natural gas instruments, net	0	0
Trading securities		0
Total Assets	0	0
Liability Class:
Liabilities related to non-qualified retirement plan	0	0
Derivatives – natural gas instruments, net	0
Derivatives – foreign currency swaps	0	0
Total Liabilities	$ 0	$ 0
4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	4.875%
Fair value of senior notes	$ 247,200,000
Aggregate principal amount due at maturity	250,000,000
Term loan [Member]
Debt Instrument [Line Items]
Aggregate principal amount due at maturity	924,700,000
Fair value of credit agreement debt	$ 912,200,000

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net (loss) earnings	$ (6.4)	$ 6.3	$ 15.1	$ 56
Less: net (loss) earnings allocated to participating securities	(0.1)	(0.1)	(0.2)	(0.3)
Net earnings available to common shareholders	$ (6.5)	$ 6.2	$ 14.9	$ 55.7
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share (in shares)	33,823	33,784	33,813	33,766
Weighted-average awards outstanding (in shares)	0	3	0	3
Shares for diluted earnings per share (in shares)	33,823	33,787	33,813	33,769
Net earnings per common share, basic (in dollars per share)	$ (0.19)	$ 0.18	$ 0.44	$ 1.65
Net earnings per common share, diluted (in dollars per share)	$ (0.19)	$ 0.18	$ 0.44	$ 1.65
Participating securities (in shares)	169	146	163	149
Weighted anti-dilutive awards outstanding (in shares)	728	580	609	491

Subsequent Event (Details)

Subsequent Event (Details) $ in Millions	3 Months Ended
	Sep. 30, 2017USD ($)
Scenario, Forecast [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Restructuring charges	$ 4