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Plant Closure Provisions (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Plant Closure Provisions (Textual) [Abstract]
Expenditure	$ 2.7	$ 3.8	$ 3.9
Remediation charge for changes in the scope and cost of future remediation activities	0.2	0.6	8.7
Severance [Member]
Plant Closure Provisions (Textual) [Abstract]
Number of Reporting Segment	3
Expenditure	0.6	0.7	0.4
Other Restructuring [Member]
Plant Closure Provisions (Textual) [Abstract]
Expenditure	0	0	0.8
Residual accrual	0.1
Remediation [Member]
Plant Closure Provisions (Textual) [Abstract]
Expenditure	2.1	3.1	2.7
Accretion expense recognized	2.2
Remediation charge for changes in the scope and cost of future remediation activities	$ 1.8

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Restructuring charge residual accrual.

+ References

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 143

-Paragraph 13, 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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.

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Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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-Name Emerging Issues Task Force (EITF)

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-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.



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