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Financial Instrument, Risk Management and Fair Value Measurements, Fair Value (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 15.2 | [1] |  |  | $ 6.1 | [1]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down | 1.0 | [2] | 0.4 | [2] |  |
Derivative Liability, Fair Value, Gross Liability | 7.4 | [3] |  |  | 8.3 | [3]
Restructuring Charges | (8.4) |  | (1.1) |  |  |
Other Restructuring Activities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down | 0 | [2] | 0.4 | [2] | 3.1 |
Restructuring Charges | (2.6) |  | (1.1) |  |  |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other Assets, Fair Value Disclosure | 36.1 |  |  |  | 33.0 |
Assets, Fair Value Disclosure | 45.1 |  |  |  | 34.7 |
Business Acquisition, Contingent Consideration, at Fair Value | 1.0 |  |  |  | 1.0 |
Other Liabilities, Fair Value Disclosure | 42.5 |  |  |  | 39.8 |
Liabilities, Fair Value Disclosure | 44.7 |  |  |  | 44.7 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Exchange Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 6.0 |  |  |  | 1.5 |
Derivative Liability, Fair Value, Gross Liability | 0.9 |  |  |  | 2.4 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Energy Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 2.8 |  |  |  | 0 |
Derivative Liability, Fair Value, Gross Liability | 0.3 |  |  |  | 1.5 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other Contract [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0.2 |  |  |  | 0.2 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other Assets, Fair Value Disclosure | 36.1 |  |  |  | 33.0 |
Assets, Fair Value Disclosure | 36.1 |  |  |  | 33.0 |
Business Acquisition, Contingent Consideration, at Fair Value | 0 |  |  |  | 0 |
Other Liabilities, Fair Value Disclosure | 42.5 |  |  |  | 39.8 |
Liabilities, Fair Value Disclosure | 42.5 |  |  |  | 39.8 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  |  |  | 0 |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  |  |  | 0 |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Contract [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  |  |  | 0 |
Assets, Fair Value Disclosure | 9.0 |  |  |  | 1.7 |
Business Acquisition, Contingent Consideration, at Fair Value | 0 |  |  |  | 0 |
Other Liabilities, Fair Value Disclosure | 0 |  |  |  | 0 |
Liabilities, Fair Value Disclosure | 1.2 |  |  |  | 3.9 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 6.0 |  |  |  | 1.5 |
Derivative Liability, Fair Value, Gross Liability | 0.9 |  |  |  | 2.4 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 2.8 |  |  |  | 0 |
Derivative Liability, Fair Value, Gross Liability | 0.3 |  |  |  | 1.5 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Contract [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0.2 |  |  |  | 0.2 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other Assets, Fair Value Disclosure | 0 |  |  |  | 0 |
Assets, Fair Value Disclosure | 0 |  |  |  | 0 |
Business Acquisition, Contingent Consideration, at Fair Value | 1.0 |  |  |  | 1.0 |
Other Liabilities, Fair Value Disclosure | 0 |  |  |  | 0 |
Liabilities, Fair Value Disclosure | 1.0 |  |  |  | 1.0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  |  |  | 0 |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Contracts [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  |  |  | 0 |
Derivative Liability, Fair Value, Gross Liability | 0 |  |  |  | 0 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Contract [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 |  |  |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restructuring Charges | (1.0) |  |  |  | (15.9) |
Restructuring and Related Cost, Incurred Cost | (4.8) |  |  |  | (5.6) |
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long Lived Assets to be Abandoned, Fair Value Disclosure | 0 |  |  |  | 3.1 |
Assets, Fair Value Disclosure | 0 |  |  |  | 3.1 |
Liabilities, Fair Value Disclosure | 4.8 |  |  |  | 5.6 |
Liabilities Associated with Exit Activities, Fair Value Disclosure | 4.8 |  |  |  | 5.6 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long Lived Assets to be Abandoned, Fair Value Disclosure | 0 |  |  |  | 0 |
Assets, Fair Value Disclosure | 0 |  |  |  | 0 |
Liabilities, Fair Value Disclosure | 0 |  |  |  | 0 |
Liabilities Associated with Exit Activities, Fair Value Disclosure | 0 |  |  |  | 0 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long Lived Assets to be Abandoned, Fair Value Disclosure | 0 |  |  |  | 0 |
Assets, Fair Value Disclosure | 0 |  |  |  | 0 |
Liabilities, Fair Value Disclosure | 4.8 |  |  |  | 5.6 |
Liabilities Associated with Exit Activities, Fair Value Disclosure | 4.8 |  |  |  | 5.6 |
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long Lived Assets to be Abandoned, Fair Value Disclosure | 0 |  |  |  | 3.1 |
Assets, Fair Value Disclosure | 0 |  |  |  | 3.1 |
Liabilities, Fair Value Disclosure | 0 |  |  |  | 0 |
Liabilities Associated with Exit Activities, Fair Value Disclosure | 0 |  |  |  | 0 |
Specialty Chemicals [Member] | Other Restructuring Activities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down | 0 |  |  |  |  |
Agricultural Products [Member] | Other Restructuring Activities [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down |  |  |  |  | $ 0 |
[1] | Net balance is included in “Prepaid and other current assets” in the condensed consolidated balance sheets.
[2] | Primarily represents accelerated depreciation and impairment charges on plant and equipment, which were or are to be abandoned. Asset disposal charges also included the acceleration effect of re-estimating settlement dates and revised cost estimates associated with asset retirement obligations due to facility shutdowns, see Note 8.
[3] | Net balance is included in “Accrued and other liabilities” in the condensed consolidated balance sheets.

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- Definition Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747 + Details
Name: | us-gaap_RestructuringCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration