Compass Minerals International (CMP) 10-Q 28 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 24, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'COMPASS MINERALS INTERNATIONAL INC	'
Entity Central Index Key	'0001227654	'
Current Fiscal Year End Date	'--12-31	'
Entity Well-known Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	33,588,443
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'

CONSOLIDATED_BALANCE_SHEETS_Un

CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Current assets:	'		'
Cash and cash equivalents	$220		$159.60
Receivables, less allowance for doubtful accounts of $1.3 in 2014 and $1.6 in 2013	145.3		211.9
Inventories	217.8		180.7
Deferred income taxes, net	8.2		7.9
Other	19.6		17.3
Total current assets	610.9		577.4
Property, plant and equipment, net	691.3		677.3
Intangible assets, net	110		72.5
Goodwill	71		20.5
Other	63.3		57.1
Total assets	1,546.50		1,404.80
Current liabilities:	'		'
Current portion of long-term debt	3.9		3.9
Accounts payable	75.9		109.4
Accrued expenses	54.4		54.3
Deferred revenue	0		56.5
Accrued salaries and wages	20		21.6
Income taxes payable	12.3		11
Accrued interest	3.7		0.9
Total current liabilities	170.2		257.6
Long-term debt, net of current portion	623.5		474.7
Deferred income taxes, net	100.6		78.4
Other noncurrent liabilities	36.2		39.9
Commitments and contingencies (Note 10)	'		'
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	79.8		70.4
Treasury stock, at cost - 1,779,073 shares at September 30, 2014 and 1,890,367 shares at December 31, 2013	-3.4		-3.6
Retained earnings	529.2		452.5
Accumulated other comprehensive income	10	[1]	34.5	[1]
Total stockholders' equity	616		554.2
Total liabilities and stockholders' equity	$1,546.50		$1,404.80
[1]	With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.

CONSOLIDATED_BALANCE_SHEETS_Un1

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Current assets:	'	'
Allowance for doubtful accounts	$1.30	$1.60
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)	1,779,073	1,890,367

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended			9 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]	'		'	'		'
Sales	$240.50		$184.70	$849.10		$742.20
Shipping and handling cost	57.5		44.4	233		200
Product cost (Note 3)	33.2		94.5	336.5		363.2
Gross profit	149.8		45.8	279.6		179
Selling, general and administrative expenses	26.8		22.7	76.2		73.7
Operating earnings	123	[1]	23.1	203.4	[1]	105.3
Other (income) expense:	'		'	'		'
Interest expense	5.5		4.4	14.4		13.2
Other, net	-3.1		-0.1	0.9		-3.2
Earnings before income taxes	120.6		18.8	188.1		95.3
Income tax expense	32.7		3.4	50.7		22.9
Net earnings	$87.90		$15.40	$137.40		$72.40
Basic net earnings per common share (in dollars per share)	$2.60		$0.46	$4.07		$2.15
Diluted net earnings per common share (in dollars per share)	$2.60		$0.46	$4.07		$2.15
Weighted-average common shares outstanding:	'		'	'		'
Basic (in shares)	33,575		33,469	33,542		33,378
Diluted (in shares)	33,601		33,484	33,566		33,402
Cash dividends per share (in dollars per share)	$0.60		$0.55	$1.80		$1.64
[1]	Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]	'	'	'	'
Net earnings	$87.90	$15.40	$137.40	$72.40
Other comprehensive income (loss):	'	'	'	'
Gain from change in pension obligations, net of tax of $(0.1) and $(0.3) in the three and nine months ended September 30, 2014, respectively, and $0.3 and $0.1 in the three and nine months ended September 30, 2013	0.3	0.7	0.9	1.3
Net gain (loss) on cash flow hedges, net of tax of $0.3 and $0.2 in the three and nine months ended September 30, 2014, respectively, and $0.0 and $(0.1) in the three and nine months ended September 30, 2013, respectively	-0.5	0	-0.4	0.2
Cumulative translation adjustment	-28.4	16	-25	-12.6
Comprehensive income	$59.30	$32.10	$112.90	$61.30

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]	'	'	'	'
Gain from change in pension obligations, tax	($0.10)	$0.30	($0.30)	$0.10
Net gain (loss) on cash flow hedges, tax	$0.30	$0	$0.20	($0.10)

CONSOLIDATED_STATEMENT_OF_STOC

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
In Millions
Balance at Dec. 31, 2013	$0.40	$70.40	($3.60)	$452.50	$34.50	$554.20
Dividends on common stock	'	'	'	-60.7	'	-60.7
Stock options exercised	'	5.9	0.2	'	'	6.1
Income tax deficiency from equity awards	'	-0.2	'	'	'	-0.2
Stock-based compensation	'	3.7	'	'	'	3.7
Comprehensive income	'	'	'	137.4	-24.5	112.9
Balance at Sep. 30, 2014	$0.40	$79.80	($3.40)	$529.20	$10	$616

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net earnings	$137.40	$72.40
Adjustments to reconcile net earnings to net cash flows provided by operating activities:	'	'
Depreciation, depletion and amortization	57.2	53.4
Finance fee amortization	0.9	0.9
Early extinguishment of debt	6.9	0
Stock-based compensation	3.7	4.1
Deferred income taxes	13	3.2
Gain from insurance settlement	-83.3	0
Other, net	-0.3	1
Insurance receipts for operating purposes, Goderich tornado	11.9	4.2
Changes in operating assets and liabilities, net of acquisition:	'	'
Receivables	64	45.2
Inventories	-38.1	-8
Other assets	-11.3	-6.3
Accounts payable and accrued expenses	-32.1	-26.9
Other liabilities	-0.2	-1.1
Net cash provided by operating activities	129.7	142.1
Cash flows from investing activities:	'	'
Capital expenditures	-83.5	-83.1
Acquisition of a business	-86.5	0
Insurance receipts for investment purposes, Goderich tornado	19.4	11.9
Other, net	3.1	2.5
Net cash used in investing activities	-147.5	-68.7
Cash flows from financing activities:	'	'
Proceeds from issuance of long-term debt	250	0
Principal payments on long-term debt	-101.4	-2.9
Premium and other payments to refinance debt	-5.5	0
Deferred financing costs	-4.1	0
Dividends paid	-60.6	-54.9
Proceeds received from stock option exercises	6.1	10.6
Excess tax benefit (deficiency) from equity compensation awards	-0.2	0.7
Net cash provided by (used in) financing activities	84.3	-46.5
Effect of exchange rate changes on cash and cash equivalents	-6.1	-3.1
Net change in cash and cash equivalents	60.4	23.8
Cash and cash equivalents, beginning of the year	159.6	100.1
Cash and cash equivalents, end of period	220	123.9
Supplemental cash flow information:	'	'
Interest paid, net of amounts capitalized	10.8	10.7
Income taxes paid, net of refunds	33.2	20
Fair value of assets acquired	99.2	'
Cash paid during the nine months ended September 30, 2014	-86.5	'
Liabilities assumed	$12.70	'

Accounting_Policies_and_Basis_

Accounting Policies and Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Accounting Policies and Basis of Presentation [Abstract]	'
Accounting Policies and Basis of Presentation	'
	1.  Accounting Policies and Basis of Presentation:
	Compass Minerals International, Inc., through its subsidiaries, is a producer and marketer of inorganic mineral products with manufacturing sites in North America and the U.K.  References to the “Company,” “Compass,” “Compass Minerals,” “CMP,” “we,” “us” and “our” refer to Compass Minerals International, Inc. (“CMI”, the parent holding company) and its consolidated subsidiaries. The Company’s principal products are salt, consisting of sodium chloride and magnesium chloride, and sulfate of potash (“SOP”), which is primarily used as a specialty crop fertilizer.  The Company provides highway deicing products to customers in North America and the U.K., and plant nutrition products to growers worldwide.  The Company also produces and markets consumer deicing and water conditioning products, salt ingredients used in consumer and commercial food preparation, and other mineral-based products for consumer, agricultural and industrial applications.  CMP also provides records management services to businesses located in the U.K.
	CMP is a holding company with no operations other than those of its wholly-owned subsidiaries.  The consolidated financial statements include the accounts of CMP and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
	The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. These unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements of CMP for the year ended December 31, 2013 as filed with the Securities and Exchange Commission in its Annual Report on Form 10-K. In the opinion of management, all adjustments, consisting of normal recurring accruals considered necessary for a fair presentation, have been included.
	The Company experiences a substantial amount of seasonality in salt segment sales, primarily with respect to its deicing products. As a result, sales and operating income are generally higher in the first and fourth quarters and lower during the second and third quarters of each year.  In particular, sales of highway and consumer deicing salt and magnesium chloride products vary based on the severity of the winter conditions in areas where the product is used. Following industry practice in North America and the U.K., the Company seeks to stockpile sufficient quantities of deicing salt throughout the second, third and fourth quarters to meet the estimated requirements for the upcoming winter season. Production of deicing salt can vary based on the severity or mildness of the preceding winter season.  Due to the seasonal nature of the deicing product lines, operating results for the interim periods are not necessarily indicative of the results that may be expected for the full year.
	Reclassifications – The prior year amount of goodwill included in other assets in the Company’s consolidated financial statements has been disaggregated due to the significance of goodwill resulting from the Wolf Trax, Inc. acquisition (see Note 2).
	Recent Accounting Pronouncements – In August 2014, the Financial Accounting Standards Board (“FASB”) issued guidance which requires management to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide disclosure in the footnotes under certain circumstances.  This guidance is effective for fiscal years ending after December 15, 2016 with early adoption permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.
	In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers.  The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services.  This guidance is effective for fiscal years and interim periods with those years beginning after December 15, 2016 and early adoption is not permitted.  The guidance permits the use of either a full or modified retrospective or cumulative effect transition method.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.
	In April 2014, the FASB issued guidance which changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations.  Under the new guidance, disposals that represent a strategic shift that have or will have a major effect on an entity’s operations or financial results should be reported as discontinued operations.  The guidance is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2014.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.
	In January 2014, the FASB issued guidance related to service concession arrangements.  The guidance states that entities should not account for certain service concession arrangements with public-sector entities as leases and should not recognize any infrastructure as property, plant and equipment. The guidance is effective for fiscal years beginning after December 15, 2014.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2014
Acquisition [Abstract]	'
Acquisition	'
	2.  Acquisition:
	In April 2014, the Company completed the acquisition of Wolf Trax, Inc., a privately-held Canadian corporation (recently renamed Compass Minerals Manitoba Inc. (“Compass Manitoba”)), which develops and distributes plant nutrition products.  The Company purchased all of the stock of Wolf Trax, Inc. for $95.5 million Canadian dollars (approximately $86.5 million U.S. dollars at the closing date) in cash, after customary post-closing adjustments.  Compass Manitoba develops and markets innovative crop nutrient products based upon proprietary and patented technologies.  The acquisition has provided an opportunity for the Company’s plant nutrition segment to enter new product and geographic markets and position itself as a key resource for premium plant nutrition products.
	The acquisition has been accounted for as a business combination in accordance with GAAP and the results of operations have been included from the date of acquisition in the Company’s plant nutrition segment (formerly known as the specialty fertilizer segment).  Pro forma results of operations have not been presented as the pro forma revenues and earnings were not significant to the historical periods. The Company engaged an independent third-party expert to assist in the allocation of the purchase price. The purchase price was finalized in the third quarter of 2014 and was allocated to the assets acquired and liabilities assumed based on the estimated fair values as follows (in millions):
		Estimated
		Fair Value
	Receivables	$	2.3
	Inventories		1.8
	Other current assets		0.1
	Property, plant and equipment		0.3
	Intangible assets		42.8
	Goodwill		51.9
	Liabilities assumed		(1.1	)
	Deferred income taxes and other noncurrent tax liabilities		(11.6	)
	Total purchase price	$	86.5
	The purchase price in excess of the fair value of tangible assets acquired has been allocated to identifiable intangible assets and goodwill, which are not deductible for tax purposes.  The amount of goodwill recorded reflects the future earnings and cash flow potential of the new crop nutrition products as well as the complementary strategic fit of the product line.  In connection with the acquisition, the Company acquired identifiable intangible assets, which consisted principally of patents, distributor relationships, developed technology and a trade name.   The fair values were determined using Level 3 inputs (see Note 14 for a discussion of the levels in the fair value hierarchy).  The distributor relationships were valued using a cost approach method.  All of the other identifiable assets were valued using an income approach method.  The estimated fair values and weighted average amortization periods of the identifiable intangible assets are as follows:
					Weighted
		Estimated			Average
		Fair Value			Amortization
		(in millions)			Period
	Identifiable Intangible Assets:
	Patents	$	18.8		12 years
	Developed technology		3.4		5 years
	Distributor relationships		6.8		10 years
	Trademarks		1.2		10 years
	Trade name		12.3		Indefinite
	Noncompete agreements		0.3		5 years
	Total identifiable intangible assets	$	42.8		11 years

Goderich_Tornado

Goderich Tornado	9 Months Ended
	Sep. 30, 2014
Goderich Tornado [Abstract]	'
Goderich Tornado	'
	3. Goderich Tornado:
	In August 2011, a tornado struck the Company’s salt mine and its salt mechanical evaporation plant, both located in Goderich, Ontario.  There was no damage to the underground operations at the mine.  However, some of the mine’s surface structures and the evaporation plant incurred significant damage which temporarily ceased production at both facilities.  Both facilities resumed normal production and shipping activities in 2012.
	The Company recorded impairment of its property, plant and equipment and clean-up and restoration costs during 2011 through 2013 related to the impacted areas at both of the Goderich facilities.  There were no material expenses or charges related to the tornado in 2014.  During the first nine months of 2013, the Company received $18.5 million of insurance advances and recorded $1.2 million of these advances as a reduction to salt product cost in its consolidated statements of operations to offset recognized asset impairment charges and site clean-up and restoration costs during the first nine months of 2013.  The remainder of cash advances received was recorded as deferred revenue in the consolidated balance sheets as GAAP limits the recognition of gains in the consolidated statements of operation related to insurance recoveries until all contingencies have been resolved.  The Company recorded approximately $16.1 million of the insurance advances as deferred revenue in the first nine months of 2013 in the consolidated balance sheets and has presented these amounts in its operating and investing sections of the consolidated statements of cash flows.  In the third quarter of 2014, the Company resolved all contingencies and settled its insurance claim.  The settlement included a substantial amount related to business interruption losses.  Cumulatively, the Company received $114.9 million in cash, including approximately $28.6 million received in 2014 which was originally recorded as deferred revenue in the Company’s consolidated balance sheets.  The insurance proceeds included approximately $26.9 million related to clean-up and restoration costs and asset impairment charges and approximately $83.3 million of proceeds for the replacement of property, plant and equipment and business interruption losses.  In connection with the settlement, the Company released its deferred revenue balance of $83.3 million and recorded a gain of $82.3 million as a reduction to product cost and approximately $1.0 million as a reduction to selling, general and administrative expenses in its consolidated statements of operations for the third quarter of 2014.  The difference between the cash received and the amounts recorded above relates to the foreign exchange impact from translating amounts from Canadian dollars to U.S. dollars.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2014
Inventories [Abstract]	'
Inventories	'
	4.  Inventories:
	Inventories consist of the following (in millions):
		September 30,		December 31,
		2014		2013
	Finished goods	$	173	$	139.4
	Raw materials and supplies		44.8		41.3
	Total inventories	$	217.8	$	180.7

Property_Plant_and_Equipment_N

Property, Plant and Equipment, Net	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment, Net [Abstract]	'
Property, Plant and Equipment, Net	'
	5.  Property, Plant and Equipment, Net:
	Property, plant and equipment, net consists of the following (in millions):
		September 30,			December 31,
		2014			2013
	Land, buildings and structures and leasehold improvements	$	346.1		$	347.1
	Machinery and equipment		677.4			668
	Office furniture and equipment		23.3			21.5
	Mineral interests		182.2			180.9
	Construction in progress		103.7			69.5
			1,332.70			1,287.00
	Less accumulated depreciation and depletion		(641.4	)		(609.7	)
	Total property, plant and equipment, net	$	691.3		$	677.3

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets, Net	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets, Net [Abstract]	'
Goodwill and Intangible Assets, Net	'
	6.  Goodwill and Intangible Assets, Net:
	The asset value and accumulated amortization as of September 30, 2014 and December 31, 2013 for the finite-lived intangibles assets are as follows (in millions):
						SOP			Customer/
			Supply			Production			Distributor			Lease
			Agreement			Rights			Relationships			Rights			Patents			Other			Total
	September 30, 2014:
	Gross intangible asset		$	32.5		$	24.3		$	8.8		$	2		$	18.5		$	4.8		$	90.9
	Accumumlated amortization			(2.5	)		(10.5	)		(2.2	)		(0.2	)		(0.8	)		(0.4	)		(16.6	)
	Net intangible assets		$	30		$	13.8		$	6.6		$	1.8		$	17.7		$	4.4		$	74.3
						SOP
			Supply			Production			Customer			Lease
			Agreement			Rights			Relationships			Rights			Total
	December 31, 2013:
	Gross intangible asset		$	34.1		$	24.3		$	2.1		$	2.1		$	62.6
	Accumumlated amortization			(2.0	)		(9.8	)		(1.8	)		(0.1	)		(13.7	)
	Net intangible assets		$	32.1		$	14.5		$	0.3		$	2		$	48.9
	In addition, the Company has water rights of $22.9 million as of September 30, 2014 and December 31, 2013, and trade names of $12.8 million and $0.7 million as of September 30, 2014 and December 31, 2013, respectively, which have indefinite lives.
	The estimated lives of the Company’s intangible assets are as follows:
		Estimated
	Intangible asset	Lives
	Supply agreement	50 years
	SOP production rights	25 years
	Patents	10-20 years
	Developed technology	5 years
	Lease rights	25 years
	Customer and distributor relationships	5-10 years
	Trademarks	10 years
	Noncompete agreements	5 years
	Trade names	Indefinite
	Water rights	Indefinite
	None of the finite-lived intangible assets have a residual value.  Aggregate amortization expense was $1.3 million and $0.5 million in the third quarters of 2014 and 2013, respectively, and $3.1 million and $1.5 million in the first nine months of 2014 and 2013, respectively.
	The Company has goodwill of $71.0 million and $20.5 million as of September 30, 2014 and December 31, 2013, in its consolidated balance sheets.  Approximately $64.3 million and $13.8 million of the amounts recorded for goodwill as of September 30, 2014 and December 31, 2013, respectively, were recorded in the Company’s plant nutrition segment and the remaining amounts in both periods were immaterial and recorded in its corporate and other and salt segment.  The increase in the balance of goodwill from December 31, 2013 was primarily a result of additional goodwill recorded of $51.9 million, at closing, related to the acquisition of Wolf Trax, Inc. in April 2014.  The remaining difference was due to the impact from translating foreign denominated amounts to U.S. dollars.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	7.  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 tax rate for the third quarter of 2014 and the first nine months of 2014 increased from the same periods in the prior year due to higher pretax income and refinements made in 2014 and 2013 related to the expected full-year effective tax rate.  The Company’s effective rate is impacted by permanent tax deductions which have a less favorable impact as pretax income increases.
	At both September 30, 2014 and December 31, 2013, the Company had approximately $4.1 million of gross foreign federal net operating loss (“NOL”) carryforwards that have no expiration date and $0.1 million of tax-effected state NOL carryforwards which expire in 2033. In the future, if the Company determines, based on the existence of sufficient evidence, that it should realize more or less of its deferred tax assets, an adjustment to any existing valuation allowance will be made in the period such determination is made.
	Canadian provincial tax authorities have challenged tax positions claimed by one of the Company’s Canadian subsidiaries and have issued tax reassessments for years 2002-2009.  The reassessments are a result of ongoing audits and total approximately $84 million, including interest through September 2014.  The Company disputes these reassessments and plans to continue to work with the appropriate authorities in Canada to resolve the dispute.  There is a reasonable possibility that the ultimate resolution of this dispute, and any related disputes for other open tax years, may be materially higher or lower than the amounts the Company has reserved for such disputes.  In connection with this dispute, local regulations require the Company to post security with the tax authority until the dispute is resolved.  The Company and the tax authority have agreed that it will post collateral of approximately $30 million in a performance bond (including approximately $6 million of the performance bond which will be cancelled pro rata as the outstanding assessment balance falls below the outstanding amount of the performance bond).  As part of the additional required collateral, the Company has previously paid approximately $30 million and it has agreed to pay an additional approximately $1 million during the remainder of 2014 with the remaining collateral balance to be paid after 2014.  The Company will be required by the same local regulations to provide security for additional interest on the above disputed amounts and for any future reassessments issued by these Canadian tax authorities in the form of cash, letters of credit, performance bonds, asset liens or other arrangements agreeable with the tax authorities until the dispute is resolved.
	In addition, Canadian federal and provincial taxing authorities have reassessed the Company for years 2004-2006 which have been previously settled by agreement among the Company, the Canadian federal taxing authority and the U.S. federal taxing authority.  The Company has fully complied with the agreement since entering into it and it believes this action is highly unusual.  The Company is seeking to enforce the agreement which provided the basis upon which the returns were previously filed and settled.  The total amount of the reassessments, including penalties and interest through September, 2014, related to this matter is approximately $100 million.  The Company has agreed to post collateral in the form of a performance bond for approximately $21 million and has previously made cash payments of approximately $2 million.  The Company is currently in discussions with the Canadian tax authorities regarding the remaining required collateral of approximately $42 million.
	The Company expects that the ultimate outcome of these matters will not have a material impact on its results of operations or financial condition. However, the Company can provide no assurance as to the ultimate outcome of these matters and the impact could be material if they are not resolved in the Company’s favor.  As of September 30, 2014, 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.

Longterm_Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2014
Long-term Debt [Abstract]	'
Long-term Debt	'
	8.  Long-term Debt:
	Long-term debt consists of the following (in millions):
		September 30,			December 31,
		2014			2013
	Term Loan due May 2017	$	377.4		$	380.2
	Revolving Credit Facility due August 2017		-			-
	8% Senior Notes due June 2019		-			98.4
	4.875% Senior Notes due July 2024		250			-
			627.4			478.6
	Less current portion		(3.9	)		(3.9	)
	Total long-term debt	$	623.5		$	474.7
	In June 2014, the Company issued senior notes (“4.875% Senior Notes”) with an aggregate face amount of $250.0 million due in 2024 which bear interest at a rate of 4.875% per year payable semi-annually in January and July, beginning in January 2015. The 4.875% Senior Notes were issued at their face value.  With the proceeds of the 4.875% Senior Notes, the Company redeemed all of its outstanding $100.0 million aggregate principal amount of 8% senior notes due 2019 (“8% Senior Notes”).  In connection with the debt refinancing, the Company incurred approximately $8.1 million of costs, including $4.1 million of fees that were capitalized as deferred financing costs related to the 4.875% Senior Notes and $4.0 million in call premiums.  The $4.0 million paid for call premiums along with the write-off of $1.4 million of the Company’s unamortized deferred financing costs and approximately $1.5 million of original issue discount, each related to the 8% Senior Notes, were recorded in other expense in the consolidated statements of operations for the nine months ended September 30, 2014.
	The Term Loan and Revolving Credit Facility are secured by substantially all existing and future assets of the Company’s subsidiaries.

UK_Pension_Plan

U.K. Pension Plan	9 Months Ended
	Sep. 30, 2014
U.K. Pension Plan [Abstract]	'
U.K. Pension Plan	'
	9.  U.K. Pension Plan:
	The components of net periodic benefit cost related to its U.K. defined benefit pension plan for the three and nine months ended September 30, 2014 and 2013 are as follows (in millions):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Interest cost on projected benefit obligation	$	0.8		$	0.8		$	2.4		$	2.3
	Expected return on plan assets		(0.9	)		(0.7	)		(2.6	)		(2.1	)
	Net amortization		0.4			0.4			1.2			1.3
	Net pension expense	$	0.3		$	0.5		$	1		$	1.5
	During the first nine months of 2014 and 2013, the Company made $1.3 million and $1.2 million of contributions in the first nine months of 2014 and 2013, respectively, to its U.K. defined benefit pension plan.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	10.  Commitments and Contingencies:
	The Company is involved in legal and administrative proceedings and claims of various types from normal Company activities.
	The Company is aware of an aboriginal land claim filed in 2003 by The Chippewas of Nawash and The Chippewas of Saugeen (the “Chippewas”) in the Ontario Superior Court against The Attorney General of Canada and Her Majesty The Queen In Right of Ontario. The Chippewas claim that a large part of the land under Lake Huron was never surrendered by treaty and thus seeks a declaration that the Chippewas hold aboriginal title to those submerged lands.  The land to which aboriginal title is claimed includes land under which the Company’s Goderich mine operates and has mining rights granted to it by the government of Ontario. The actions also seek damages for the value and loss of use of lands.  The Company is not a party to the court actions. The Company understands that Canada and Ontario are defending the actions for aboriginal title on the basis, among other things, that common law does not recognize aboriginal title to the Great Lakes and other navigable waterways.
	The Wisconsin Department of Agriculture, Trade and Consumer Protection (“DATCP”) has information indicating that agricultural chemicals are present within the subsurface area of the Kenosha, Wisconsin plant. The agricultural chemicals were used by previous owners and operators of the site.  None of the identified chemicals have been used in association with Compass Minerals’ operations since it acquired the property in 2002.  DATCP directed the Company to conduct further investigations into the possible presence of agricultural chemicals in soil and ground water at the Kenosha plant.  The Company has completed such investigations of the soils and ground water and has provided the findings to DATCP. The Company is presently proceeding with select remediation activities to mitigate agricultural chemical impact to soils and ground water at the site.  All investigations and mitigation activities to date, and any potential future remediation work, are being conducted under the Wisconsin Agricultural Chemical Cleanup Program (“ACCP”), which would provide for reimbursement of some of the costs. The Company may seek participation by, or cost reimbursement from, 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 acknowledgement of no further action and is required to conduct further investigation or remedial work that may not be eligible for reimbursement under the ACCP.
	In December 2009, a surface salt storage dome which was under construction collapsed at the Company’s mine in Goderich, Ontario. The Company is involved in construction litigation and other contract claims relating to the dome’s collapse.  Claims asserted against the Company total approximately $13 million.  The Company has also counterclaimed for damages.
	The Company is also involved in legal and administrative proceedings and claims of various types from normal Company activities.
	The Company does not believe that these actions will have a material adverse financial effect on the Company. Furthermore, while any litigation contains an element of uncertainty, management presently believes that the outcome of each such proceeding or claim, which is pending or known to be threatened, or all of them combined, will not have a material adverse effect on the Company’s results of operations, cash flows or financial position.

Operating_Segments

Operating Segments	9 Months Ended
	Sep. 30, 2014
Operating Segments [Abstract]	'
Operating Segments	'
	11.  Operating Segments:
	As discussed in Note 2, the Company broadened its portfolio of specialty plant nutrient products with the acquisition of Wolf Trax, Inc. (renamed Compass Manitoba) in the second quarter of 2014.  The strategic focus of this segment seeks to differentiate the Company’s portfolio of crop nutrient products from commodity fertilizers.  As a result, the specialty fertilizer segment has been renamed plant nutrition.  The results of operations and financial position for Compass Manitoba have been included in the Company’s plant nutrition segment from the date of the acquisition.  Segment information is as follows (in millions):
			Three Months Ended September 30, 2014
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	175.4	$	62.7	$	2.4		$	240.5
	Intersegment sales			0.3		1.5		(1.8	)		-
	Shipping and handling cost			51.6		5.9		-			57.5
	Operating earnings (loss) (b)			116.7		19		(12.7	)		123
	Depreciation, depletion and amortization			11.4		7.1		1.5			20
	Total assets (as of end of period)			970.1		517.7		58.7			1,546.50
			Three Months Ended September 30, 2013
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	142.6	$	39.1	$	3		$	184.7
	Intersegment sales			0.1		1.6		(1.7	)		-
	Shipping and handling cost			40.2		4.2		-			44.4
	Operating earnings (loss)			25.4		9.6		(11.9	)		23.1
	Depreciation, depletion and amortization			11.2		5.8		1			18
	Total assets (as of end of period)			842		393		77.3			1,312.30
			Nine Months Ended September 30, 2014
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	647.3	$	194.4	$	7.4		$	849.1
	Intersegment sales			0.7		4.7		(5.4	)		-
	Shipping and handling cost			211.7		21.3		-			233
	Operating earnings (loss) (b)			187		53.2		(36.8	)		203.4
	Depreciation, depletion and amortization			33.5		20		3.7			57.2
			Nine Months Ended September 30, 2013
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	597.4	$	137.2	$	7.6		$	742.2
	Intersegment sales			0.6		4.5		(5.1	)		-
	Shipping and handling cost			185		15		-			200
	Operating earnings (loss)			106.5		39		(40.2	)		105.3
	Depreciation, depletion and amortization			32.7		17.6		3.1			53.4
	(a)	“Corporate and Other” includes corporate entities, the records management business, other incidental business operations and eliminations.  Corporate assets include deferred tax assets, deferred financing fees, investments related to the non-qualified retirement plan, and other assets not allocated to the operating segments.
	(b)	Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.

Stockholders_Equity_and_Equity

Stockholders' Equity and Equity Instruments	9 Months Ended
	Sep. 30, 2014
Stockholders' Equity and Equity Instruments [Abstract]	'
Stockholders' Equity and Equity Instruments	'
	12.  Stockholders’ Equity and Equity Instruments:
	In the first nine months of 2014, the Company granted 95,610 stock options, 16,725 restricted stock units (“RSUs”) and 27,574 performance stock units (“PSUs”) to certain employees under its 2005 Incentive Award Plan.  The Company’s closing stock price on the grant date was used to set the exercise price for the options and the fair value of the RSUs.  The options vest ratably on each anniversary date over a four-year service period. Unexercised options expire after seven years. The RSUs vest on the third anniversary following the grant date. None of the awards granted have voting rights.  The RSUs granted entitle the holders to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock for RSUs earned.
	The PSUs granted in 2014 have a three-year performance period beginning in 2014 and ending in 2016.  The PSUs earn between 0% and 150% based upon the Company’s total shareholder return, compared to the total shareholder return for each company comprising the Russell 3000 Index over the three-year period.  The performance units will vest three years after the grant date.  The PSUs granted entitle the holders to receive non-forfeitable dividends or other distributions equal to those declared on the Company’s common stock from the grant date through the vest date for PSUs earned.
	To estimate the fair value of options on the grant date, the Company uses the Black-Scholes option valuation model.  Award recipients are grouped according to expected exercise behavior. Unless better information is available to estimate the expected term of the options, the estimate is based on historical exercise experience. The risk-free rate, using U.S. Treasury yield curves in effect at the time of grant, is selected based on the expected term of each group. The Company’s historical stock price is used to estimate expected volatility.  The range of estimates and calculated fair values for options granted during the first nine months of 2014 is included in the table below. The weighted-average grant date fair value of these options was $15.25.
			Range
	Fair value of options granted		$14.08 - $16.23
	Exercise price		$87.18
	Expected term (years)		5-Apr
	Expected volatility		26.5% - 28.8%
	Dividend yield		3.40%
	Risk-free rate of return		1.4% - 1.6%
	To estimate the fair value of the PSUs on the grant date, the Company uses a Monte-Carlo simulation model, which simulates future stock prices of the Company as well as the companies comprising the Russell 3000 Index.  This model uses historical stock prices to estimate expected volatility and the Company’s correlation to the Russell 3000 Index.  The risk-free rate was determined using the same methodology as the option valuations as discussed above. The estimated fair value of the PSUs granted in 2014 is $105.77 per unit.
	During the nine months ended September 30, 2014, the Company reissued 91,181 shares of treasury stock related to the exercise of stock options, 15,636 shares related to the release of RSUs which vested, 3,998 shares related to the release of PSUs which vested and 479 shares related to stock payments.  The Company recognized a tax deficiency of $0.2 million from its equity compensation awards as a reduction of additional paid-in capital during the first nine months of 2014. During the nine months ended September 30, 2014 and 2013, the Company recorded $3.7 million and $4.1 million, respectively, of compensation expense pursuant to its stock-based compensation plans.  No amounts have been capitalized. The following table summarizes stock-based compensation activity during the nine months ended September 30, 2014.
			Stock Options						RSUs						PSUs(a)
						Weighted-average						Weighted-average						Weighted-average
			Number			exercise price			Number			fair value			Number			fair value
	Outstanding at December 31, 2013			328,364		$	72.88			95,718		$	76.09			55,149		$	80.89
	Granted			95,610			87.18			16,725			87.18			27,574			105.77
	Exercised (b)			(91,181	)		66.86			-			-			-			-
	Released from restriction (b)			-			-			(15,636	)		86.48			(3,998	)		93.82
	Cancelled/Expired			(15,145	)		78.64			(4,316	)		77.6			(12,395	)		91.8
	Outstanding at September 30, 2014			317,648		$	78.64			92,491		$	76.27			66,330		$	88.42
	(a)	Until they vest, PSUs are included in the table at the 100% attainment level at their grant date and at that level represent one share per unit.  The final performance period for the 2011 PSU grant was completed in 2013.  The Company issued 3,998 shares and cancelled 9,330 PSUs in March 2014 related to the 2011 PSU grant.
	(b)	Common stock issued for exercised options and RSUs and PSUs released from restriction were 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 (“AOCI”) as of and for the three and nine months ended September 30, 2014 and 2013 are as follows (in millions):
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Three Months Ended September 30, 2014 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	0.4		$	(8.7	)	$	46.9		$	38.6
	Other comprehensive income (loss) before reclassifications (b)			(0.5	)		-			(28.4	)		(28.9	)
	Amounts reclassified from accumulated other comprehensive income			-			0.3			-			0.3
	Net current period other comprehensive income (loss)			(0.5	)		0.3			(28.4	)		(28.6	)
	Ending balance		$	(0.1	)	$	(8.4	)	$	18.5		$	10
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Three Months Ended September 30, 2013 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	(0.5	)	$	(9.0	)	$	39.3		$	29.8
	Other comprehensive income (loss) before reclassifications (b)			-			-			16			16
	Amounts reclassified from accumulated other comprehensive income			-			0.7			-			0.7
	Net current period other comprehensive income			-			0.7			16			16.7
	Ending balance		$	(0.5	)	$	(8.3	)	$	55.3		$	46.5
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Nine Months Ended September 30, 2014 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	0.3		$	(9.3	)	$	43.5		$	34.5
	Other comprehensive income (loss) before reclassifications (b)			0.2			-			(25.0	)		(24.8	)
	Amounts reclassified from accumulated other comprehensive income			(0.6	)		0.9			-			0.3
	Net current period other comprehensive income (loss)			(0.4	)		0.9			(25.0	)		(24.5	)
	Ending balance		$	(0.1	)	$	(8.4	)	$	18.5		$	10
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Nine Months Ended September 30, 2013 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	(0.7	)	$	(9.6	)	$	67.9		$	57.6
	Other comprehensive income (loss) before reclassifications (b)			(0.2	)		-			(12.6	)		(12.8	)
	Amounts reclassified from accumulated other comprehensive income			0.4			1.3			-			1.7
	Net current period other comprehensive income (loss)			0.2			1.3			(12.6	)		(11.1	)
	Ending balance		$	(0.5	)	$	(8.3	)	$	55.3		$	46.5
	(a)	With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.
(b)	The Company recorded foreign exchange losses of approximately $10.4 million and $10.8 million in the three months and nine months ended September 30, 2014, respectively, and foreign exchange losses (gains) of $5.9 million and $(7.5) million in the three months and nine months ended September 30, 2013, respectively, in accumulated other comprehensive income related to intercompany notes which were deemed to be of long-term investment nature.
The amounts reclassified from AOCI to income for the three and nine months ended September 30, 2014 and 2013 are shown below (in millions):
		Amount Reclassified from AOCI
		Three Months Ended			Nine Months Ended			Line Item Impacted in the
		30-Sep-14			30-Sep-14			Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments		$	(0.1	)	$	(1.0	)	Product cost
			0.1			0.4		Income tax expense (benefit)
Reclassifications, net of income taxes			-			(0.6	)
Amortization of defined benefit pension:
Amortization of loss		$	0.4		$	1.2		Product cost
			(0.1	)		(0.3	)	Income tax expense (benefit)
Reclassifications, net of income taxes			0.3			0.9
Total reclassifications, net of income taxes		$	0.3		$	0.3
		Amount Reclassified from AOCI
		Three Months Ended			Nine Months Ended			Line Item Impacted in the
		30-Sep-13			30-Sep-13			Consolidated Statement of Operations
Gains and (losses) on cash flow hedges:
Natural gas instruments		$	0.1		$	0.7		Product cost
			(0.1	)		(0.3	)	Income tax expense (benefit)
Reclassifications, net of income taxes			-			0.4
Amortization of defined benefit pension:
Amortization of loss		$	0.4		$	1.2		Product cost
			(0.1	)		(0.3	)	Income tax expense (benefit)
			0.4			0.4		Deferred tax asset
Reclassifications, net of income taxes			0.7			1.3
Total reclassifications, net of income taxes		$	0.7		$	1.7

Derivative_Financial_Instrumen

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2014
Derivative Financial Instruments [Abstract]	'
Derivative Financial Instruments	'
	13.  Derivative Financial Instruments:
	The Company is subject to various types of market risks including interest rate risk, foreign currency exchange rate transaction and translation risk, and commodity pricing risk.  Management may take actions to mitigate the exposure to these types of risks, including entering into forward purchase contracts and other financial instruments.  Currently, the Company manages a portion of its commodity pricing risk by using derivative instruments.  The Company does not seek to engage in trading activities or take speculative positions with any financial instrument arrangements. The Company has entered into natural gas derivative instruments with counterparties it views as creditworthy.  However, management does attempt to mitigate its counterparty credit risk exposures by, among other things, entering into master netting agreements with these counterparties.
	Cash Flow Hedges
	As of September 30, 2014, the Company has entered into natural gas derivative instruments. The Company records derivative financial instruments as either assets or liabilities at fair value in the consolidated statements of financial position.  Derivatives qualify for treatment as hedges when there is a high correlation between the change in fair value of the derivative instrument and the related change in value of the underlying hedged item. Depending on the exposure being hedged, the Company must designate the hedging instrument as a fair value hedge, a cash flow hedge or a net investment in foreign operations hedge.  All derivative instruments held by the Company as of September 30, 2014 and December 31, 2013 qualified as cash flow hedges. For these qualifying hedges, the effective portion of the change in fair value is recognized through earnings when the underlying transaction being hedged affects earnings, allowing a derivative’s gains and losses to offset related results from the hedged item in the statements of operations (see Note 12). For derivative instruments that are not accounted for as hedges, or for the ineffective portions of qualifying hedges, the change in fair value is recorded through earnings in the period of change. The Company formally documents, designates, and assesses the effectiveness of transactions that receive hedge accounting treatment initially and on an ongoing basis.  Any ineffectiveness related to these hedges was not material for any of the periods presented.
	Natural gas is consumed at several of the Company’s production facilities, and a change in natural gas prices impacts the Company’s operating margin.  As of September 30, 2014, the Company had entered into natural gas derivative instruments to hedge a portion of its natural gas purchase requirements through December 2016.  The Company’s objective is to reduce the earnings and cash flow impacts of changes in market prices of natural gas by fixing the purchase price of up to 90% of its forecasted natural gas usage.  It is the Company’s policy to consider hedging portions of its natural gas usage up to 36 months in advance of the forecasted purchase. As of September 30, 2014 and December 31, 2013, the Company had agreements in place to hedge forecasted natural gas purchases of 3.8 and 2.1 million MMBtus, respectively.
	As of September 30, 2014, the Company expects to reclassify from accumulated other comprehensive income to earnings during the next twelve months approximately $0.1 million of net losses on derivative instruments related to its natural gas hedges.
	The following tables present the fair value of the Company’s hedged items as of September 30, 2014 and December 31, 2013, (in millions):
		Asset Derivatives			Liability Derivatives
	Derivatives designated as hedging instruments(a):	Balance Sheet Location	30-Sep-14		Balance Sheet Location	30-Sep-14
	Commodity contracts(b)	Other current assets	$	0.3	Accrued expenses	$	0.3
	Commodity contracts	Other assets		0.1	Other noncurrent liabilities		0.4
	Total derivatives designated as hedging instruments		$	0.4		$	0.7
	(a)	As of September 30, 2014, the Company has commodity hedge agreements with four counterparties.  The amounts shown as liabilities are due to three counterparties.  The amount recorded as an asset is primarily due from two counterparties.
	(b)	The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.
		Asset Derivatives			Liability Derivatives
	Derivatives designated as hedging instruments(a):	Balance Sheet Location	31-Dec-13		Balance Sheet Location	31-Dec-13
	Commodity contracts(b)	Other current assets	$	0.7	Accrued expenses	$	0.4
	Commodity contracts	Other assets		-	Other noncurrent liabilities		-
	Total derivatives designated as hedging instruments		$	0.7		$	0.4
	(a)	The Company has commodity hedge agreements with three counterparties.  Amounts recorded as liabilities for the Company’s commodity contracts are payable to two counterparties.  The amount recorded as an asset is due from one counterparty.
	(b)	The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Measurements [Abstract]	'
Fair Value Measurements	'
	14.  Fair Value Measurements:
	The Company’s financial instruments are measured and reported at their estimated fair value.  Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction.  When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (level one inputs), or absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (level two inputs). The Company does not have any unobservable inputs that are not corroborated by market inputs (level three inputs) except as discussed in Note 2.
	The Company holds marketable securities associated with its non-qualified retirement plan, which are valued based on readily available quoted market prices.  The Company utilizes derivative instruments to manage its risk of changes in natural gas prices.  The fair value of the natural gas derivative instruments are determined using market data of forward prices for all of the Company’s contracts.  The estimated fair values for each type of instrument are presented below (in millions).
			30-Sep-14			Level One			Level Two			Level Three
	Asset Class:
	Mutual fund investments in a non-qualified retirement plan(a)		$	2.2		$	2.2		$	-		$	-
	Derivatives – natural gas instruments			0.2			-			0.2			-
	Total Assets		$	2.4		$	2.2		$	0.2		$	-
	Liability Class:
	Liabilities related to non-qualified retirement plan		$	(2.2	)	$	(2.2	)	$	-		$	-
	Derivatives – natural gas instruments			(0.5	)		-			(0.5	)		-
	Total Liabilities		$	(2.7	)	$	(2.2	)	$	(0.5	)	$	-
	(a)	Includes mutual fund investments of approximately 15% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small-cap U.S. companies, approximately 5% in international funds, approximately 40% in short-term investments and approximately 35% in blended funds.
			December 31,			Level One			Level Two			Level Three
			2013
	Asset Class:
	Mutual fund investments in a non-qualified retirement plan(a)		$	4.5		$	4.5		$	-		$	-
	Derivatives – natural gas instruments			0.5			-			0.5			-
	Total Assets		$	5		$	4.5		$	0.5		$	-
	Liability Class:
	Liabilities related to non-qualified retirement plan		$	(4.5	)	$	(4.5	)	$	-		$	-
	Derivatives – natural gas instruments			(0.2	)		-			(0.2	)		-
	Total Liabilities		$	(4.7	)	$	(4.5	)	$	(0.2	)	$	-
	(a)	Includes mutual fund investments of approximately 5% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small to mid-cap U.S. companies, approximately 65% in short-term investments and approximately 25% 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 $2.2 million and $4.5 million as of September 30, 2014 and December 31, 2013, respectively, are stated at fair value based on quoted market prices.  As of September 30, 2014, the estimated amount a third-party would pay for the fixed-rate 4.875% Senior Notes, based on available trading information, totaled $238.6 million (level 2) compared with the aggregate principal amount at maturity of $250.0 million. The estimated amount a third-party would pay at September 30, 2014 for the amounts outstanding under the credit agreement, based upon available bid information received from the Company’s lender, totaled $373.6 million (level 2) compared with the aggregate principal balance of $377.4 million.

Earnings_per_Share

Earnings per Share	9 Months Ended
	Sep. 30, 2014
Earnings per Share [Abstract]	'
Earnings (Loss) per Share	'
	15.  Earnings per Share:
	The Company calculates earnings per share using the two-class method.  The two-class method requires allocating the Company’s net earnings to both common shares and participating securities.  The following table sets forth the computation of basic and diluted earnings per common share (in millions, except for share and per-share data):
			Three months ended						Nine months ended
			September 30,						September 30,
			2014			2013			2014			2013
	Numerator:
	Net earnings		$	87.9		$	15.4		$	137.4		$	72.4
	Less: net earnings allocated to participating securities (a)			(0.5	)		(0.1	)		(0.8	)		(0.6	)
	Net earnings available to common shareholders		$	87.4		$	15.3		$	136.6		$	71.8
	Denominator (in thousands):
	Weighted-average common shares outstanding, shares for basic earnings per share			33,575			33,469			33,542			33,378
	Weighted-average awards outstanding (b)			26			15			24			24
	Shares for diluted earnings per share			33,601			33,484			33,566			33,402
	Net earnings per common share, basic		$	2.6		$	0.46		$	4.07		$	2.15
	Net earnings per common share, diluted		$	2.6		$	0.46		$	4.07		$	2.15
	(a)	Participating securities include options, PSUs and RSUs that receive non-forfeitable dividends. Weighted participating securities included 209,000 and 214,000 for the three and nine months ended September 30, 2014, respectively, and 275,000 and 305,000 for the three and nine months ended September 30, 2013, 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 389,000 and 397,000 weighted-awards outstanding for the three and nine months ended September 30, 2014, respectively, and 410,000 and 469,000 for the three and nine months ended September 30, 2013, respectively, which were anti-dilutive and therefore not included in the diluted earnings per-share calculation.

Accounting_Policies_and_Basis_1

Accounting Policies and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies and Basis of Presentation [Abstract]	'
Reclassifications	'
	Reclassifications – The prior year amount of goodwill included in other assets in the Company’s consolidated financial statements has been disaggregated due to the significance of goodwill resulting from the Wolf Trax, Inc. acquisition (see Note 2).
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements – In August 2014, the Financial Accounting Standards Board (“FASB”) issued guidance which requires management to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide disclosure in the footnotes under certain circumstances.  This guidance is effective for fiscal years ending after December 15, 2016 with early adoption permitted.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.
	In May 2014, the FASB issued guidance to provide a single, comprehensive revenue recognition model for all contracts with customers.  The new revenue recognition model supersedes existing revenue recognition guidance and requires revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services.  This guidance is effective for fiscal years and interim periods with those years beginning after December 15, 2016 and early adoption is not permitted.  The guidance permits the use of either a full or modified retrospective or cumulative effect transition method.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.
	In April 2014, the FASB issued guidance which changes the requirements for reporting discontinued operations and requires additional disclosures about discontinued operations.  Under the new guidance, disposals that represent a strategic shift that have or will have a major effect on an entity’s operations or financial results should be reported as discontinued operations.  The guidance is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2014.  The Company does not expect that this guidance will have a material impact on its consolidated financial statements.
	In January 2014, the FASB issued guidance related to service concession arrangements.  The guidance states that entities should not account for certain service concession arrangements with public-sector entities as leases and should not recognize any infrastructure as property, plant and equipment. The guidance is effective for fiscal years beginning after December 15, 2014.  The Company is currently evaluating the impact that the implementation of this standard will have on its consolidated financial statements.

Acquisition_Tables

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2014
Acquisition [Abstract]	'
Assets acquired and liabilities assumed based on estimated fair values	'
	The purchase price was finalized in the third quarter of 2014 and was allocated to the assets acquired and liabilities assumed based on the estimated fair values as follows (in millions):
		Estimated
		Fair Value
	Receivables	$	2.3
	Inventories		1.8
	Other current assets		0.1
	Property, plant and equipment		0.3
	Intangible assets		42.8
	Goodwill		51.9
	Liabilities assumed		(1.1	)
	Deferred income taxes and other noncurrent tax liabilities		(11.6	)
	Total purchase price	$	86.5
Fair values and weighted average amortization of identifiable intangible assets	'
	The estimated fair values and weighted average amortization periods of the identifiable intangible assets are as follows:
					Weighted
		Estimated			Average
		Fair Value			Amortization
		(in millions)			Period
	Identifiable Intangible Assets:
	Patents	$	18.8		12 years
	Developed technology		3.4		5 years
	Distributor relationships		6.8		10 years
	Trademarks		1.2		10 years
	Trade name		12.3		Indefinite
	Noncompete agreements		0.3		5 years
	Total identifiable intangible assets	$	42.8		11 years

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2014
Inventories [Abstract]	'
Inventories	'
	Inventories consist of the following (in millions):
		September 30,		December 31,
		2014		2013
	Finished goods	$	173	$	139.4
	Raw materials and supplies		44.8		41.3
	Total inventories	$	217.8	$	180.7

Property_Plant_and_Equipment_N1

Property, Plant and Equipment, Net (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment, Net [Abstract]	'
Property, plant and equipment	'
	Property, plant and equipment, net consists of the following (in millions):
		September 30,			December 31,
		2014			2013
	Land, buildings and structures and leasehold improvements	$	346.1		$	347.1
	Machinery and equipment		677.4			668
	Office furniture and equipment		23.3			21.5
	Mineral interests		182.2			180.9
	Construction in progress		103.7			69.5
			1,332.70			1,287.00
	Less accumulated depreciation and depletion		(641.4	)		(609.7	)
	Total property, plant and equipment, net	$	691.3		$	677.3

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets, Net (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets, Net [Abstract]	'
Schedule of finite-lived intangible assets	'
	The asset value and accumulated amortization as of September 30, 2014 and December 31, 2013 for the finite-lived intangibles assets are as follows (in millions):
						SOP			Customer/
			Supply			Production			Distributor			Lease
			Agreement			Rights			Relationships			Rights			Patents			Other			Total
	September 30, 2014:
	Gross intangible asset		$	32.5		$	24.3		$	8.8		$	2		$	18.5		$	4.8		$	90.9
	Accumumlated amortization			(2.5	)		(10.5	)		(2.2	)		(0.2	)		(0.8	)		(0.4	)		(16.6	)
	Net intangible assets		$	30		$	13.8		$	6.6		$	1.8		$	17.7		$	4.4		$	74.3
						SOP
			Supply			Production			Customer			Lease
			Agreement			Rights			Relationships			Rights			Total
	December 31, 2013:
	Gross intangible asset		$	34.1		$	24.3		$	2.1		$	2.1		$	62.6
	Accumumlated amortization			(2.0	)		(9.8	)		(1.8	)		(0.1	)		(13.7	)
	Net intangible assets		$	32.1		$	14.5		$	0.3		$	2		$	48.9
Estimated lives of intangible assets	'
	The estimated lives of the Company’s intangible assets are as follows:
		Estimated
	Intangible asset	Lives
	Supply agreement	50 years
	SOP production rights	25 years
	Patents	10-20 years
	Developed technology	5 years
	Lease rights	25 years
	Customer and distributor relationships	5-10 years
	Trademarks	10 years
	Noncompete agreements	5 years
	Trade names	Indefinite
	Water rights	Indefinite

Longterm_Debt_Tables

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Long-term Debt [Abstract]	'
Long-term debt	'
	Long-term debt consists of the following (in millions):
		September 30,			December 31,
		2014			2013
	Term Loan due May 2017	$	377.4		$	380.2
	Revolving Credit Facility due August 2017		-			-
	8% Senior Notes due June 2019		-			98.4
	4.875% Senior Notes due July 2024		250			-
			627.4			478.6
	Less current portion		(3.9	)		(3.9	)
	Total long-term debt	$	623.5		$	474.7

UK_Pension_Plan_Tables

U.K. Pension Plan (Tables)	9 Months Ended
	Sep. 30, 2014
U.K. Pension Plan [Abstract]	'
Components of net periodic benefit cost related to its U.K. defined benefit pension plan	'
	The components of net periodic benefit cost related to its U.K. defined benefit pension plan for the three and nine months ended September 30, 2014 and 2013 are as follows (in millions):
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Interest cost on projected benefit obligation	$	0.8		$	0.8		$	2.4		$	2.3
	Expected return on plan assets		(0.9	)		(0.7	)		(2.6	)		(2.1	)
	Net amortization		0.4			0.4			1.2			1.3
	Net pension expense	$	0.3		$	0.5		$	1		$	1.5

Operating_Segments_Tables

Operating Segments (Tables)	9 Months Ended
	Sep. 30, 2014
Operating Segments [Abstract]	'
Segment information	'
	Segment information is as follows (in millions):
			Three Months Ended September 30, 2014
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	175.4	$	62.7	$	2.4		$	240.5
	Intersegment sales			0.3		1.5		(1.8	)		-
	Shipping and handling cost			51.6		5.9		-			57.5
	Operating earnings (loss) (b)			116.7		19		(12.7	)		123
	Depreciation, depletion and amortization			11.4		7.1		1.5			20
	Total assets (as of end of period)			970.1		517.7		58.7			1,546.50
			Three Months Ended September 30, 2013
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	142.6	$	39.1	$	3		$	184.7
	Intersegment sales			0.1		1.6		(1.7	)		-
	Shipping and handling cost			40.2		4.2		-			44.4
	Operating earnings (loss)			25.4		9.6		(11.9	)		23.1
	Depreciation, depletion and amortization			11.2		5.8		1			18
	Total assets (as of end of period)			842		393		77.3			1,312.30
			Nine Months Ended September 30, 2014
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	647.3	$	194.4	$	7.4		$	849.1
	Intersegment sales			0.7		4.7		(5.4	)		-
	Shipping and handling cost			211.7		21.3		-			233
	Operating earnings (loss) (b)			187		53.2		(36.8	)		203.4
	Depreciation, depletion and amortization			33.5		20		3.7			57.2
			Nine Months Ended September 30, 2013
					Plant		Corporate
			Salt		Nutrition		and Other (a)			Total
	Sales to external customers		$	597.4	$	137.2	$	7.6		$	742.2
	Intersegment sales			0.6		4.5		(5.1	)		-
	Shipping and handling cost			185		15		-			200
	Operating earnings (loss)			106.5		39		(40.2	)		105.3
	Depreciation, depletion and amortization			32.7		17.6		3.1			53.4
	(a)	“Corporate and Other” includes corporate entities, the records management business, other incidental business operations and eliminations.  Corporate assets include deferred tax assets, deferred financing fees, investments related to the non-qualified retirement plan, and other assets not allocated to the operating segments.
	(b)	Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.

Stockholders_Equity_and_Equity1

Stockholders' Equity and Equity Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Stockholders' Equity and Equity Instruments [Abstract]	'
Range of estimates and calculated fair values of options granted in period	'
	The weighted-average grant date fair value of these options was $15.25.
			Range
	Fair value of options granted		$14.08 - $16.23
	Exercise price		$87.18
	Expected term (years)		5-Apr
	Expected volatility		26.5% - 28.8%
	Dividend yield		3.40%
	Risk-free rate of return		1.4% - 1.6%
Stock-based compensation activity	'
	The following table summarizes stock-based compensation activity during the nine months ended September 30, 2014.
			Stock Options						RSUs						PSUs(a)
						Weighted-average						Weighted-average						Weighted-average
			Number			exercise price			Number			fair value			Number			fair value
	Outstanding at December 31, 2013			328,364		$	72.88			95,718		$	76.09			55,149		$	80.89
	Granted			95,610			87.18			16,725			87.18			27,574			105.77
	Exercised (b)			(91,181	)		66.86			-			-			-			-
	Released from restriction (b)			-			-			(15,636	)		86.48			(3,998	)		93.82
	Cancelled/Expired			(15,145	)		78.64			(4,316	)		77.6			(12,395	)		91.8
	Outstanding at September 30, 2014			317,648		$	78.64			92,491		$	76.27			66,330		$	88.42
	(a)	Until they vest, PSUs are included in the table at the 100% attainment level at their grant date and at that level represent one share per unit.  The final performance period for the 2011 PSU grant was completed in 2013.  The Company issued 3,998 shares and cancelled 9,330 PSUs in March 2014 related to the 2011 PSU grant.
	(b)	Common stock issued for exercised options and RSUs and PSUs released from restriction were issued from treasury stock.
Components of and changes in accumulated other comprehensive income	'
	The components of and changes in accumulated other comprehensive income (“AOCI”) as of and for the three and nine months ended September 30, 2014 and 2013 are as follows (in millions):
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Three Months Ended September 30, 2014 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	0.4		$	(8.7	)	$	46.9		$	38.6
	Other comprehensive income (loss) before reclassifications (b)			(0.5	)		-			(28.4	)		(28.9	)
	Amounts reclassified from accumulated other comprehensive income			-			0.3			-			0.3
	Net current period other comprehensive income (loss)			(0.5	)		0.3			(28.4	)		(28.6	)
	Ending balance		$	(0.1	)	$	(8.4	)	$	18.5		$	10
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Three Months Ended September 30, 2013 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	(0.5	)	$	(9.0	)	$	39.3		$	29.8
	Other comprehensive income (loss) before reclassifications (b)			-			-			16			16
	Amounts reclassified from accumulated other comprehensive income			-			0.7			-			0.7
	Net current period other comprehensive income			-			0.7			16			16.7
	Ending balance		$	(0.5	)	$	(8.3	)	$	55.3		$	46.5
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Nine Months Ended September 30, 2014 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	0.3		$	(9.3	)	$	43.5		$	34.5
	Other comprehensive income (loss) before reclassifications (b)			0.2			-			(25.0	)		(24.8	)
	Amounts reclassified from accumulated other comprehensive income			(0.6	)		0.9			-			0.3
	Net current period other comprehensive income (loss)			(0.4	)		0.9			(25.0	)		(24.5	)
	Ending balance		$	(0.1	)	$	(8.4	)	$	18.5		$	10
			Gains and
			(Losses) on			Defined
			Cash Flow			Benefit			Foreign
	Nine Months Ended September 30, 2013 (a)		Hedges			Pension			Currency			Total
	Beginning balance		$	(0.7	)	$	(9.6	)	$	67.9		$	57.6
	Other comprehensive income (loss) before reclassifications (b)			(0.2	)		-			(12.6	)		(12.8	)
	Amounts reclassified from accumulated other comprehensive income			0.4			1.3			-			1.7
	Net current period other comprehensive income (loss)			0.2			1.3			(12.6	)		(11.1	)
	Ending balance		$	(0.5	)	$	(8.3	)	$	55.3		$	46.5
	(a)	With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.
	(b)	The Company recorded foreign exchange losses of approximately $10.4 million and $10.8 million in the three months and nine months ended September 30, 2014, respectively, and foreign exchange losses (gains) of $5.9 million and $(7.5) million in the three months and nine months ended September 30, 2013, respectively, in accumulated other comprehensive income 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 for the three and nine months ended September 30, 2014 and 2013 are shown below (in millions):
			Amount Reclassified from AOCI
			Three Months Ended			Nine Months Ended			Line Item Impacted in the
			30-Sep-14			30-Sep-14			Consolidated Statement of Operations
	Gains and (losses) on cash flow hedges:
	Natural gas instruments		$	(0.1	)	$	(1.0	)	Product cost
				0.1			0.4		Income tax expense (benefit)
	Reclassifications, net of income taxes			-			(0.6	)
	Amortization of defined benefit pension:
	Amortization of loss		$	0.4		$	1.2		Product cost
				(0.1	)		(0.3	)	Income tax expense (benefit)
	Reclassifications, net of income taxes			0.3			0.9
	Total reclassifications, net of income taxes		$	0.3		$	0.3
			Amount Reclassified from AOCI
			Three Months Ended			Nine Months Ended			Line Item Impacted in the
			30-Sep-13			30-Sep-13			Consolidated Statement of Operations
	Gains and (losses) on cash flow hedges:
	Natural gas instruments		$	0.1		$	0.7		Product cost
				(0.1	)		(0.3	)	Income tax expense (benefit)
	Reclassifications, net of income taxes			-			0.4
	Amortization of defined benefit pension:
	Amortization of loss		$	0.4		$	1.2		Product cost
				(0.1	)		(0.3	)	Income tax expense (benefit)
				0.4			0.4		Deferred tax asset
	Reclassifications, net of income taxes			0.7			1.3
	Total reclassifications, net of income taxes		$	0.7		$	1.7

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Financial Instruments [Abstract]	'
Fair value of hedged items	'
	The following tables present the fair value of the Company’s hedged items as of September 30, 2014 and December 31, 2013, (in millions):
		Asset Derivatives			Liability Derivatives
	Derivatives designated as hedging instruments(a):	Balance Sheet Location	30-Sep-14		Balance Sheet Location	30-Sep-14
	Commodity contracts(b)	Other current assets	$	0.3	Accrued expenses	$	0.3
	Commodity contracts	Other assets		0.1	Other noncurrent liabilities		0.4
	Total derivatives designated as hedging instruments		$	0.4		$	0.7
	(a)	As of September 30, 2014, the Company has commodity hedge agreements with four counterparties.  The amounts shown as liabilities are due to three counterparties.  The amount recorded as an asset is primarily due from two counterparties.
	(b)	The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.
		Asset Derivatives			Liability Derivatives
	Derivatives designated as hedging instruments(a):	Balance Sheet Location	31-Dec-13		Balance Sheet Location	31-Dec-13
	Commodity contracts(b)	Other current assets	$	0.7	Accrued expenses	$	0.4
	Commodity contracts	Other assets		-	Other noncurrent liabilities		-
	Total derivatives designated as hedging instruments		$	0.7		$	0.4
	(a)	The Company has commodity hedge agreements with three counterparties.  Amounts recorded as liabilities for the Company’s commodity contracts are payable to two counterparties.  The amount recorded as an asset is due from one counterparty.
	(b)	The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Measurements [Abstract]	'
Fair value measurements	'
	The estimated fair values for each type of instrument are presented below (in millions).
			30-Sep-14			Level One			Level Two			Level Three
	Asset Class:
	Mutual fund investments in a non-qualified retirement plan(a)		$	2.2		$	2.2		$	-		$	-
	Derivatives – natural gas instruments			0.2			-			0.2			-
	Total Assets		$	2.4		$	2.2		$	0.2		$	-
	Liability Class:
	Liabilities related to non-qualified retirement plan		$	(2.2	)	$	(2.2	)	$	-		$	-
	Derivatives – natural gas instruments			(0.5	)		-			(0.5	)		-
	Total Liabilities		$	(2.7	)	$	(2.2	)	$	(0.5	)	$	-
	(a)	Includes mutual fund investments of approximately 15% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small-cap U.S. companies, approximately 5% in international funds, approximately 40% in short-term investments and approximately 35% in blended funds.
			December 31,			Level One			Level Two			Level Three
			2013
	Asset Class:
	Mutual fund investments in a non-qualified retirement plan(a)		$	4.5		$	4.5		$	-		$	-
	Derivatives – natural gas instruments			0.5			-			0.5			-
	Total Assets		$	5		$	4.5		$	0.5		$	-
	Liability Class:
	Liabilities related to non-qualified retirement plan		$	(4.5	)	$	(4.5	)	$	-		$	-
	Derivatives – natural gas instruments			(0.2	)		-			(0.2	)		-
	Total Liabilities		$	(4.7	)	$	(4.5	)	$	(0.2	)	$	-
	(a)	Includes mutual fund investments of approximately 5% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small to mid-cap U.S. companies, approximately 65% in short-term investments and approximately 25% in blended funds.

Earnings_per_Share_Tables

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2014
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						Nine months ended
			September 30,						September 30,
			2014			2013			2014			2013
	Numerator:
	Net earnings		$	87.9		$	15.4		$	137.4		$	72.4
	Less: net earnings allocated to participating securities (a)			(0.5	)		(0.1	)		(0.8	)		(0.6	)
	Net earnings available to common shareholders		$	87.4		$	15.3		$	136.6		$	71.8
	Denominator (in thousands):
	Weighted-average common shares outstanding, shares for basic earnings per share			33,575			33,469			33,542			33,378
	Weighted-average awards outstanding (b)			26			15			24			24
	Shares for diluted earnings per share			33,601			33,484			33,566			33,402
	Net earnings per common share, basic		$	2.6		$	0.46		$	4.07		$	2.15
	Net earnings per common share, diluted		$	2.6		$	0.46		$	4.07		$	2.15
	(a)	Participating securities include options, PSUs and RSUs that receive non-forfeitable dividends. Weighted participating securities included 209,000 and 214,000 for the three and nine months ended September 30, 2014, respectively, and 275,000 and 305,000 for the three and nine months ended September 30, 2013, 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 389,000 and 397,000 weighted-awards outstanding for the three and nine months ended September 30, 2014, respectively, and 410,000 and 469,000 for the three and nine months ended September 30, 2013, respectively, which were anti-dilutive and therefore not included in the diluted earnings per-share calculation.

Acquisition_Details

Acquisition (Details)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014
In Millions, unless otherwise specified	USD ($)	USD ($)	Wolf Trax, Inc. [Member]	Wolf Trax, Inc. [Member]
			USD ($)	CAD
Business Acquisition [Line Items]	'	'	'	'
Receivables	'	'	$2.30	'
Inventories	'	'	1.8	'
Other current assets	'	'	0.1	'
Property, plant and equipment	'	'	0.3	'
Intangible assets	'	'	42.8	'
Goodwill	71	20.5	51.9	'
Liabilities assumed	'	'	-1.1	'
Deferred income taxes and other noncurrent tax liabilities	'	'	-11.6	'
Total purchase price	'	'	$86.50	95.5

Acquisition_Intangible_Assets_

Acquisition, Intangible Assets Acquired as Part of Business Combination (Details) (Wolf Trax, Inc. [Member], USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	$42.80
Total identifiable intangible assets, Weighted Average Amortization Period	'11 years
Patents [Member]	'
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	18.8
Total identifiable intangible assets, Weighted Average Amortization Period	'12 years
Developed Technology [Member]	'
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	3.4
Total identifiable intangible assets, Weighted Average Amortization Period	'5 years
Distributor Relationships [Member]	'
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	6.8
Total identifiable intangible assets, Weighted Average Amortization Period	'10 years
Trademarks [Member]	'
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	1.2
Total identifiable intangible assets, Weighted Average Amortization Period	'10 years
Trade Names [Member]	'
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	12.3
Noncompete Agreements [Member]	'
Fair values and weighted average amortization of identifiable intangible assets [Abstract]	'
Total identifiable intangible assets, Estimated Fair Value	$0.30
Total identifiable intangible assets, Weighted Average Amortization Period	'5 years

Goderich_Tornado_Details

Goderich Tornado (Details) (USD $)	3 Months Ended	9 Months Ended		38 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014
Goderich Tornado [Abstract]	'	'	'	'
Total insurance advances	'	'	$18.50	$114.90
Total insurance advances received and recorded as reduction to salt product costs	'	'	1.2	26.9
Deferred revenue	'	28.6	16.1	'
Insurance proceeds for replacement of property, plant and equipment and business interruption	'	'	'	83.3
Deferred revenue released in connection with settlement	83.3	83.3	'	83.3
Gain recorded as reduction to production cost	82.3	82.3	'	'
Gain recorded as reduction to selling, general and administrative expenses	$1	$1	'	'

Inventories_Details

Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventories [Abstract]	'	'
Finished goods	$173	$139.40
Raw materials and supplies	44.8	41.3
Total inventories	$217.80	$180.70

Property_Plant_and_Equipment_N2

Property, Plant and Equipment, Net (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	$1,332.70	$1,287
Less accumulated depreciation and depletion	-641.4	-609.7
Total property, plant and equipment, net	691.3	677.3
Land, Buildings and Structures and Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	346.1	347.1
Machinery and Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	677.4	668
Office Furniture and Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	23.3	21.5
Mineral Interests [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	182.2	180.9
Construction in Progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	$103.70	$69.50

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets, Net (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross intangible asset	$90.90	'	$90.90	'	$62.60
Accumulated amortization	-16.6	'	-16.6	'	-13.7
Net intangible assets	74.3	'	74.3	'	48.9
Amortization expense	1.3	0.5	3.1	1.5	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'	'	'	'
Goodwill	71	'	71	'	20.5
Wolf Trax, Inc. [Member]	'	'	'	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'	'	'	'
Additional goodwill due to Wolf Trax	'	'	51.9	'	'
Water Rights [Member]	'	'	'	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'	'	'	'
Indefinite-lived intangible assets	22.9	'	22.9	'	22.9
Trade Names [Member]	'	'	'	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'	'	'	'
Indefinite-lived intangible assets	12.8	'	12.8	'	0.7
Plant Nutrition [Member]	'	'	'	'	'
Acquired Indefinite-lived Intangible Assets [Line Items]	'	'	'	'	'
Goodwill	64.3	'	64.3	'	13.8
Supply Agreement	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'50 years	'	'
Gross intangible asset	32.5	'	32.5	'	34.1
Accumulated amortization	-2.5	'	-2.5	'	-2
Net intangible assets	30	'	30	'	32.1
SOP Production Rights [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'25 years	'	'
Gross intangible asset	24.3	'	24.3	'	24.3
Accumulated amortization	-10.5	'	-10.5	'	-9.8
Net intangible assets	13.8	'	13.8	'	14.5
Customer and distributor relationships [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross intangible asset	8.8	'	8.8	'	2.1
Accumulated amortization	-2.2	'	-2.2	'	-1.8
Net intangible assets	6.6	'	6.6	'	0.3
Customer and distributor relationships [Member] | Minimum [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'5 years	'	'
Customer and distributor relationships [Member] | Maximum [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'10 years	'	'
Developed technology [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'5 years	'	'
Lease Rights [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'25 years	'	'
Gross intangible asset	2	'	2	'	2.1
Accumulated amortization	-0.2	'	-0.2	'	-0.1
Net intangible assets	1.8	'	1.8	'	2
Trademarks [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'10 years	'	'
Patents [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross intangible asset	18.5	'	18.5	'	'
Accumulated amortization	-0.8	'	-0.8	'	'
Net intangible assets	17.7	'	17.7	'	'
Patents [Member] | Minimum [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'10 years	'	'
Patents [Member] | Maximum [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'20 years	'	'
Noncompete Agreements [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Average useful life	'	'	'5 years	'	'
Other [Member]	'	'	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross intangible asset	4.8	'	4.8	'	'
Accumulated amortization	-0.4	'	-0.4	'	'
Net intangible assets	$4.40	'	$4.40	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Foreign Federal [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss carryforwards	$4.10	$4.10
State [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss carryforwards	0.1	0.1
Expiration date	31-Dec-33	'
Canadian Provincial [Member]	'	'
Income Tax Examination [Line Items]	'	'
Total reassessments including interest	84	'
Amount of security posted in the form of a performance bond	30	'
Amount to be paid as a result of cancellation of performance bonds	6	'
Amount of security posted in the form of cash	30	'
Cash security payment to be paid in 2014	1	'
Canadian Provincial [Member] | Minimum [Member]	'	'
Income Tax Examination [Line Items]	'	'
Years under reassessment	'2002	'
Canadian Provincial [Member] | Maximum [Member]	'	'
Income Tax Examination [Line Items]	'	'
Years under reassessment	'2009	'
Canadian Federal and Provincial [Member]	'	'
Income Tax Examination [Line Items]	'	'
Amount of security posted in the form of a performance bond	21	'
Amount of security posted in the form of cash	2	'
Total reassessment amount including penalty and interest 2004-2006	100	'
Collateral amount necessary for future appeal or litigation	$42	'
Canadian Federal and Provincial [Member] | Minimum [Member]	'	'
Income Tax Examination [Line Items]	'	'
Years under reassessment	'2004	'
Canadian Federal and Provincial [Member] | Maximum [Member]	'	'
Income Tax Examination [Line Items]	'	'
Years under reassessment	'2006	'

Longterm_Debt_Details

Long-term Debt (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]	'	'
Long-term debt, total	$627.40	$478.60
Less current portion	-3.9	-3.9
Long-term debt	623.5	474.7
Term Loan due May 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, total	377.4	380.2
Long term debt maturity date	31-May-17	'
Revolving Credit Facility due August 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, total	0	0
Long term debt maturity date	31-Aug-17	'
8% Senior Notes due June 2019 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, total	0	98.4
Long term debt maturity date	30-Jun-19	'
Senior notes, interest rate (in hundredths)	8.00%	'
Redemption of senior note	100	'
Debt refinance cost	8.1	'
Call Premium	4	'
Write-off deferred costs	1.4	'
Write-off of debt issue discount	1.5	'
4.875% Senior Notes due July 2024 [Member]	'	'
Debt Instrument [Line Items]	'	'
Long-term debt, total	250	0
Long term debt maturity date	31-Jul-24	'
Aggregate face amount	250	'
Senior notes, interest rate (in hundredths)	4.88%	'
Deferred financing cost	$4.10	'

UK_Pension_Plan_Details

U.K. Pension Plan (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
U.K. Pension Plan [Abstract]	'	'	'	'
Interest cost on projected benefit obligation	$0.80	$0.80	$2.40	$2.30
Expected return on plan assets	-0.9	-0.7	-2.6	-2.1
Net amortization	0.4	0.4	1.2	1.3
Net pension expense	0.3	0.5	1	1.5
Company contributions to pension plan	'	'	$1.30	$1.20

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Commitments and Contingencies [Abstract]	'
Claims asserted against the Company	$13

Operating_Segments_Details

Operating Segments (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	$240.50		$184.70		$849.10		$742.20		'
Shipping and handling cost	57.5		44.4		233		200		'
Operating earnings (loss)	123	[1]	23.1		203.4	[1]	105.3		'
Depreciation, depletion and amortization	20		18		57.2		53.4		'
Total assets	1,546.50		1,312.30		1,546.50		1,312.30		1,404.80
Gain from insurance settlement	83.3		'		83.3		0		'
Corporate and Other [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	2.4	[2]	3	[2]	7.4	[2]	7.6	[2]	'
Shipping and handling cost	0	[2]	0	[2]	0	[2]	0	[2]	'
Operating earnings (loss)	-12.7	[1],[2]	-11.9	[2]	-36.8	[1],[2]	-40.2	[2]	'
Depreciation, depletion and amortization	1.5	[2]	1	[2]	3.7	[2]	3.1	[2]	'
Total assets	58.7	[2]	77.3	[2]	58.7	[2]	77.3	[2]	'
Gain from insurance settlement	1		'		1		'		'
Operating Segments [Member] | Salt [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	175.4		142.6		647.3		597.4		'
Shipping and handling cost	51.6		40.2		211.7		185		'
Operating earnings (loss)	116.7	[1]	25.4		187	[1]	106.5		'
Depreciation, depletion and amortization	11.4		11.2		33.5		32.7		'
Total assets	970.1		842		970.1		842		'
Gain from insurance settlement	82.3		'		82.3		'		'
Operating Segments [Member] | Plant Nutrition [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	62.7		39.1		194.4		137.2		'
Shipping and handling cost	5.9		4.2		21.3		15		'
Operating earnings (loss)	19	[1]	9.6		53.2	[1]	39		'
Depreciation, depletion and amortization	7.1		5.8		20		17.6		'
Total assets	517.7		393		517.7		393		'
Intersegment Sales [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	0		0		0		0		'
Intersegment Sales [Member] | Salt [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	0.3		0.1		0.7		0.6		'
Intersegment Sales [Member] | Plant Nutrition [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	1.5		1.6		4.7		4.5		'
Intersegment Sales [Member] | Corporate and Other [Member]	'		'		'		'		'
Segment Reporting Information [Abstract]	'		'		'		'		'
Sales	($1.80)	[2]	($1.70)	[2]	($5.40)	[2]	($5.10)	[2]	'
[1]	Includes a gain of $82.3 million in the salt segment and $1.0 million in corporate and other resulting from an insurance settlement related to a tornado at its salt facilities in Goderich, Ontario in August 2011.
[2]	"Corporate and Other" includes corporate entities, the records management business, other incidental business operations and eliminations. Corporate assets include deferred tax assets, deferred financing fees, investments related to the non-qualified retirement plan, and other assets not allocated to the operating segments.

Stockholders_Equity_and_Equity2

Stockholders' Equity and Equity Instruments, Plan Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Reissued shares of treasury stock (in shares)	'	'	479	'
Tax deficiency from equity compensation awards recorded as additional paid-in capital	'	'	$0.20	'
Compensation expense recorded during period pursuant to stock-based compensation plans	'	'	3.7	4.1
Foreign Currency [Abstract]	'	'	'	'
Losses (gains) on foreign exchange of intercompany notes of long-term nature	$10.40	$5.90	$10.80	($7.50)
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'	'4 years	'
Options expiration period	'	'	'7 years	'
Fair value measurement method	'	'	'Black-Scholes option valuation model	'
Weighted-average grant date fair value of options (in dollars per share)	'	'	$15.25	'
Reissued shares of treasury stock (in shares)	'	'	91,181	'
RSUs [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'	'3 years	'
Reissued shares of treasury stock (in shares)	'	'	15,636	'
PSUs [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Performance period of PSUs	'	'	'3 years	'
Minimum percentage of earnings (in hundredths)	'	'	0.00%	'
Maximum percentage of earnings (in hundredths)	'	'	150.00%	'
Vesting period of performance units	'	'	'3 years	'
Fair value measurement method	'	'	'Monte-Carlo simulation model	'
Weighted-average grant date fair value of options (in dollars per share)	'	'	$105.77	'
Attainment level of PSU at grant date (in hundredths)	100.00%	'	100.00%	'
PSU at grant date (in shares per unit)	1	'	1	'
PSUs [Member] | 2011 Grant [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Reissued shares of treasury stock (in shares)	'	'	3,998	'

Stockholders_Equity_and_Equity3

Stockholders' Equity and Equity Instruments, Fair Value, Exercise Price Range, and Accumulated Other Comprehensive Income (Details) (Stock Options [Member], USD $)	9 Months Ended
	Sep. 30, 2014
Fair value assumptions and methodology [Abstract]	'
Lower limit of fair value of options granted (in dollars per share)	$14.08
Upper limit of fair value of options granted (in dollars per share)	$16.23
Exercise price (in dollars per share)	$87.18
Lower limit of expected volatility (in hundredths)	26.50%
Upper limit of expected volatility (in hundredths)	28.80%
Dividend yield (in hundredths)	3.40%
Risk-free rate of return lower limit (in hundredths)	1.40%
Risk-free rate of return upper limit (in hundredths)	1.60%
Minimum [Member]	'
Fair value assumptions and methodology [Abstract]	'
Expected term (in years)	'4 years
Maximum [Member]	'
Fair value assumptions and methodology [Abstract]	'
Expected term (in years)	'5 years

Stockholders_Equity_and_Equity4

Stockholders' Equity and Equity Instruments, Activity (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Stock Options [Member]	'
Stock option activity [Roll Forward]	'
Outstanding at beginning of period (in shares)	328,364
Granted (in shares)	95,610
Exercised (in shares)	-91,181	[1]
Cancelled/Expired (in shares)	-15,145
Outstanding at end of period (in shares)	317,648
Stock options, additional disclosures [Abstract]	'
Weighted-average exercise price at beginning of period (in dollars per share)	$72.88
Weighted-average exercise price, Granted (in dollars per share)	$87.18
Weighted-average exercise price, Exercised (in dollars per share)	$66.86	[1]
Weighted-average exercise price, Cancelled/Expired (in dollars per share)	$78.64
Weighted-average exercise price at end of period (in dollars per share)	$78.64
RSUs [Member]	'
Equity instruments other than options, activity [Roll Forward]	'
Outstanding at beginning of period (in shares)	95,718
Granted (in shares)	16,725
Released from restriction (in shares)	-15,636	[1]
Cancelled/Expired (in shares)	-4,316
Outstanding at end of period (in shares)	92,491
Equity instruments other than options, additional disclosures [Abstract]	'
Weighted-average fair value at beginning of period (in dollars per share)	$76.09
Weighted-average fair value, Granted (in dollars per share)	$87.18
Weighted-average fair value, Released from restriction (in dollars per share)	$86.48	[1]
Weighted-average fair value, Cancelled/Expired (in dollars per share)	$77.60
Weighted-average fair value at end of period (in dollars per share)	$76.27
PSUs [Member]	'
Equity instruments other than options, activity [Roll Forward]	'
Outstanding at beginning of period (in shares)	55,149	[2]
Granted (in shares)	27,574	[2]
Released from restriction (in shares)	-3,998	[1],[2]
Cancelled/Expired (in shares)	-12,395	[2]
Outstanding at end of period (in shares)	66,330	[2]
Equity instruments other than options, additional disclosures [Abstract]	'
Weighted-average fair value at beginning of period (in dollars per share)	$80.89	[2]
Weighted-average fair value, Granted (in dollars per share)	$105.77	[2]
Weighted-average fair value, Released from restriction (in dollars per share)	$93.82	[1],[2]
Weighted-average fair value, Cancelled/Expired (in dollars per share)	$91.80	[2]
Weighted-average fair value at end of period (in dollars per share)	$88.42	[2]
PSUs [Member] | Grant Date 2011 [Member]	'
Equity instruments other than options, activity [Roll Forward]	'
Cancelled/Expired (in shares)	-9,330
[1]	Common stock issued for exercised options and RSUs and PSUs released from restriction were issued from treasury stock.
[2]	Until they vest, PSUs are included in the table at the 100% attainment level at their grant date and at that level represent one share per unit. The final performance period for the 2011 PSU grant was completed in 2013. The Company issued 3,998 shares and cancelled 9,330 PSUs in March 2014 related to the 2011 PSU grant.

Stockholders_Equity_and_Equity5

Stockholders' Equity and Equity Instruments, Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'		'		'
Beginning Balance	$38.60	[1]	$29.80	[1]	$34.50	[1]	$57.60	[1]
Other comprehensive income (loss) before reclassifications	-28.9	[1],[2]	16	[1],[2]	-24.8	[1],[2]	-12.8	[1],[2]
Amounts reclassified from accumulated other comprehensive income	0.3	[1]	0.7	[1]	0.3	[1]	1.7	[1]
Net current period other comprehensive income (loss)	-28.6	[1]	16.7	[1]	-24.5	[1]	-11.1	[1]
Ending Balance	10	[1]	46.5	[1]	10	[1]	46.5	[1]
Gains and (Losses) on Cash Flow Hedges [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'		'		'
Beginning Balance	0.4	[1]	-0.5	[1]	0.3	[1]	-0.7	[1]
Other comprehensive income (loss) before reclassifications	-0.5	[1],[2]	0	[1],[2]	0.2	[1],[2]	-0.2	[1],[2]
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]	-0.6	[1]	0.4	[1]
Net current period other comprehensive income (loss)	-0.5	[1]	0	[1]	-0.4	[1]	0.2	[1]
Ending Balance	-0.1	[1]	-0.5	[1]	-0.1	[1]	-0.5	[1]
Defined Benefit Pension [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'		'		'
Beginning Balance	-8.7	[1]	-9	[1]	-9.3	[1]	-9.6	[1]
Other comprehensive income (loss) before reclassifications	0	[1],[2]	0	[1],[2]	0	[1],[2]	0	[1],[2]
Amounts reclassified from accumulated other comprehensive income	0.3	[1]	0.7	[1]	0.9	[1]	1.3	[1]
Net current period other comprehensive income (loss)	0.3	[1]	0.7	[1]	0.9	[1]	1.3	[1]
Ending Balance	-8.4	[1]	-8.3	[1]	-8.4	[1]	-8.3	[1]
Foreign Currency [Member]	'		'		'		'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'		'		'		'
Beginning Balance	46.9	[1]	39.3	[1]	43.5	[1]	67.9	[1]
Other comprehensive income (loss) before reclassifications	-28.4	[1],[2]	16	[1],[2]	-25	[1],[2]	-12.6	[1],[2]
Amounts reclassified from accumulated other comprehensive income	0	[1]	0	[1]	0	[1]	0	[1]
Net current period other comprehensive income (loss)	-28.4	[1]	16	[1]	-25	[1]	-12.6	[1]
Ending Balance	$18.50	[1]	$55.30	[1]	$18.50	[1]	$55.30	[1]
[1]	With the exception of the cumulative foreign currency translation adjustment, for which no tax effect is recorded, the changes in the components of accumulated other comprehensive gain (loss) presented in the table above are reflected net of applicable income taxes.
[2]	The Company recorded foreign exchange losses of approximately $10.4 million and $10.8 million in the three months and nine months ended September 30, 2014, respectively, and foreign exchange losses (gains) of $5.9 million and $(7.5) million in the three months and nine months ended September 30, 2013, respectively, in accumulated other comprehensive income related to intercompany notes which were deemed to be of long-term investment nature.

Stockholders_Equity_and_Equity6

Stockholders' Equity and Equity Instruments, Amount Reclassified from AOCI (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Product cost	$33.20	$94.50	$336.50	$363.20
Income tax expense (benefit)	32.7	3.4	50.7	22.9
Total reclassifications, net of income taxes	-87.9	-15.4	-137.4	-72.4
Reclassifications, net of income taxes [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Total reclassifications, net of income taxes	0.3	0.7	0.3	1.7
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	-0.1	0.1	-1	0.7
Income tax expense (benefit)	0.1	-0.1	0.4	-0.3
Total reclassifications, net of income taxes	0	0	-0.6	0.4
Reclassifications, net of income taxes [Member] | Amortization of defined benefit pension [Member]	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Product cost	0.4	0.4	1.2	1.2
Income tax expense (benefit)	-0.1	-0.1	-0.3	-0.3
Deferred tax assets	'	0.4	'	0.4
Total reclassifications, net of income taxes	$0.30	$0.70	$0.90	$1.30

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2014		Dec. 31, 2013
	Counterparty		Counterparty		Counterparty
	MillionsofBTU		MillionsofBTU		MillionsofBTU
Commodity Contracts [Member]	'		'		'
Derivatives, Fair Value [Line Items]	'		'		'
Underlying risk	'change in natural gas prices		'		'
Period through which natural gas is hedged	'		31-Dec-16		'
Percent of forecasted usage to be hedged (in hundredths)	90.00%		90.00%		'
Maximum period which the Company hedges in advance of forecasted purchase	'36 months		'		'
Notional amount (in MMBtus)	3.8		3.8		2.1
Net losses to be reclassified from accumulated other comprehensive income to earnings during the next 12 months	'		$0.10		'
Number of counterparties	4		4		3
Number of counterparties for amounts recorded as liabilities	3		3		2
Number of counterparties for amounts recorded as assets	2		2		1
Designated as Hedging Instruments [Member]	'		'		'
Derivatives, Fair Value [Line Items]	'		'		'
Asset Derivatives	0.4	[1]	0.4	[1]	0.7	[2]
Liability Derivatives	0.7	[1]	0.7	[1]	0.4	[2]
Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Other Current Asset [Member]	'		'		'
Derivatives, Fair Value [Line Items]	'		'		'
Asset Derivatives	0.3	[1],[3]	0.3	[1],[3]	0.7	[2],[3]
Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Other Assets [Member]	'		'		'
Derivatives, Fair Value [Line Items]	'		'		'
Asset Derivatives	0.1	[1]	0.1	[1]	0	[2]
Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Accrued Expenses [Member]	'		'		'
Derivatives, Fair Value [Line Items]	'		'		'
Liability Derivatives	0.3	[1],[3]	0.3	[1],[3]	0.4	[2],[3]
Designated as Hedging Instruments [Member] | Commodity Contracts [Member] | Other Noncurrent Liabilities [Member]	'		'		'
Derivatives, Fair Value [Line Items]	'		'		'
Liability Derivatives	0.4	[1]	$0.40	[1]	0	[2]
[1]	As of September 30, 2014, the Company has commodity hedge agreements with four counterparties. The amounts shown as liabilities are due to three counterparties. The amount recorded as an asset is primarily due from two counterparties.
[2]	The Company has commodity hedge agreements with three counterparties. Amounts recorded as liabilities for the Company's commodity contracts are payable to two counterparties. The amount recorded as an asset is due from one counterparty.
[3]	The Company has master netting agreements with its counterparties and accordingly has netted in its consolidated balance sheets immaterial amounts that are in receivable and payable positions with larger amounts that are in payable and receivable positions, respectively.

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Liability Class [Abstract]	'		'
Mutual fund investments percentage of fund invested in common stock of large-cap U.S. (in hundredths)	15.00%		5.00%
Mutual fund investments percentage of fund invested in common stock small-cap U.S. (in hundredths)	5.00%		'
Mutual fund investments percentage of fund invested in common stock of small-cap to mid-cap U.S. (in hundredths)	'		5.00%
Mutual fund investments percentage of fund invested in international funds (in hundredths)	5.00%		'
Mutual fund investments percentage of fund invested in short-term investments (in hundredths)	40.00%		65.00%
Mutual fund investments percentage of fund invested in blended funds (in hundredths)	35.00%		25.00%
New term loan [Member]	'		'
Fair Value of Outstanding Debt [Line Items]	'		'
Fair value of credit agreement debt	373.6		'
Aggregate principal amount due at maturity	377.4		'
4.875% Senior Notes due July 2024 [Member]	'		'
Fair Value of Outstanding Debt [Line Items]	'		'
Senior notes, interest rate (in hundredths)	4.88%		'
Fair value of senior notes	238.6		'
Aggregate principal amount due at maturity	250		'
Fair Value, Measurements, Recurring [Member]	'		'
Asset Class [Abstract]	'		'
Mutual fund investments in a non-qualified retirement plan	2.2	[1]	4.5	[2]
Derivatives - natural gas instruments	0.2		0.5
Total Assets	2.4		5
Liability Class [Abstract]	'		'
Liabilities related to non-qualified retirement plan	-2.2		-4.5
Derivatives - natural gas instruments	-0.5		-0.2
Total Liabilities	-2.7		-4.7
Fair Value, Measurements, Recurring [Member] | Level One [Member]	'		'
Asset Class [Abstract]	'		'
Mutual fund investments in a non-qualified retirement plan	2.2	[1]	4.5	[2]
Derivatives - natural gas instruments	0		0
Total Assets	2.2		4.5
Liability Class [Abstract]	'		'
Liabilities related to non-qualified retirement plan	-2.2		-4.5
Derivatives - natural gas instruments	0		0
Total Liabilities	-2.2		-4.5
Fair Value, Measurements, Recurring [Member] | Level Two [Member]	'		'
Asset Class [Abstract]	'		'
Mutual fund investments in a non-qualified retirement plan	0	[1]	0	[2]
Derivatives - natural gas instruments	0.2		0.5
Total Assets	0.2		0.5
Liability Class [Abstract]	'		'
Liabilities related to non-qualified retirement plan	0		0
Derivatives - natural gas instruments	-0.5		-0.2
Total Liabilities	-0.5		-0.2
Fair Value, Measurements, Recurring [Member] | Level Three [Member]	'		'
Asset Class [Abstract]	'		'
Mutual fund investments in a non-qualified retirement plan	0	[1]	0	[2]
Derivatives - natural gas instruments	0		0
Total Assets	0		0
Liability Class [Abstract]	'		'
Liabilities related to non-qualified retirement plan	0		0
Derivatives - natural gas instruments	0		0
Total Liabilities	0		0
[1]	Includes mutual fund investments of approximately 15% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small-cap U.S. companies, approximately 5% in international funds, approximately 40% in short-term investments and approximately 35% in blended funds.
[2]	Includes mutual fund investments of approximately 5% in the common stock of large-cap U.S. companies, approximately 5% in the common stock of small to mid-cap U.S. companies, approximately 65% in short-term investments and approximately 25% in blended funds.

Earnings_per_Share_Details

Earnings per Share (Details) (USD $)	3 Months Ended				9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Numerator:	'		'		'		'
Net earnings	$87.90		$15.40		$137.40		$72.40
Less: net earnings allocated to participating securities	-0.5	[1]	-0.1	[1]	-0.8	[1]	-0.6	[1]
Net earnings available to common shareholders	$87.40		$15.30		$136.60		$71.80
Denominator:	'		'		'		'
Weighted-average common shares outstanding, shares for basic earnings per share (in shares)	33,575,000		33,469,000		33,542,000		33,378,000
Weighted-average awards outstanding (in shares)	26,000	[2]	15,000	[2]	24,000	[2]	24,000	[2]
Shares for diluted earnings per share (in shares)	33,601,000		33,484,000		33,566,000		33,402,000
Net earnings per common share, basic (in dollars per share)	$2.60		$0.46		$4.07		$2.15
Net earnings per common share, diluted (in dollars per share)	$2.60		$0.46		$4.07		$2.15
Participating securities (in shares)	209,000		275,000		214,000		305,000
Weighted anti-dilutive awards outstanding (in shares)	389,000		410,000		397,000		469,000
[1]	Participating securities include options, PSUs and RSUs that receive non-forfeitable dividends. Weighted participating securities included 209,000 and 214,000 for the three and nine months ended September 30, 2014, respectively, and 275,000 and 305,000 for the three and nine months ended September 30, 2013, respectively.
[2]	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 389,000 and 397,000 weighted-awards outstanding for the three and nine months ended September 30, 2014, respectively, and 410,000 and 469,000 for the three and nine months ended September 30, 2013, respectively, which were anti-dilutive and therefore not included in the diluted earnings per-share calculation.