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Plant Closure Provisions (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Movements in plant closure and restructuring provisions |  |  |
Total at January 1 | $ 28.6 | $ 27.5 |
Charge | 2.1 | 2.1 |
Expenditure | (2.2) | (2.8) |
Exchange effect | 0 | 0.2 |
Total at September 30 | 28.5 | 27.0 |
Due within one year | (3.6) | (3.5) | (4.1)
Balance at September 30 | 24.9 | 23.5 | 24.5
Severance [Member] |  |  |
Movements in plant closure and restructuring provisions |  |  |
Total at January 1 | 1.5 |  |
Charge | 0.2 |  |
Expenditure | (0.6) |  |
Exchange effect | 0 |  |
Total at September 30 | 1.1 |  |
Due within one year | (0.1) |  |
Balance at September 30 | 1.0 |  |
Remediation [Member] |  |  |
Movements in plant closure and restructuring provisions |  |  |
Total at January 1 | 27.1 |  |
Charge | 1.9 |  |
Expenditure | (1.6) |  |
Exchange effect | 0 |  |
Total at September 30 | 27.4 |  |
Due within one year | (3.5) |  |
Balance at September 30 | $ 23.9 |  |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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