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Plant Closure Provisions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Movements in plant closure and restructuring provisions |  |  |
Beginning Balance | $ 28.6 | $ 27.5 | $ 28.4
Charge for the period | 4.2 | 5.1 | 3.0
Expenditure | (2.7) | (3.8) | (3.9)
Exchange effect | 0.3 | (0.2) | 0
Ending Balance | 30.4 | 28.6 | 27.5
Due within one year | (5.1) | (4.1) | (3.9)
Balance at December 31 | 25.3 | 24.5 | 23.6
Severance [Member] |  |  |
Movements in plant closure and restructuring provisions |  |  |
Beginning Balance | 1.5 | 1.5 | 1.3
Charge for the period | 0.2 | 0.7 | 0.5
Expenditure | (0.6) | (0.7) | (0.4)
Exchange effect | 0 | 0 | 0.1
Ending Balance | 1.1 | 1.5 | 1.5
Due within one year | (0.1) | (0.5) | (0.5)
Balance at December 31 | 1.0 | 1.0 | 1.0
Other Restructuring [Member] |  |  |
Movements in plant closure and restructuring provisions |  |  |
Beginning Balance | 0 | 0.1 | 1.0
Charge for the period | 0 | (0.1) | 0
Expenditure | 0 | 0 | (0.8)
Exchange effect | 0 | 0 | (0.1)
Ending Balance | 0 | 0 | 0.1
Due within one year | 0 | 0 | (0.1)
Balance at December 31 | 0 | 0 | 0
Remediation [Member] |  |  |
Movements in plant closure and restructuring provisions |  |  |
Beginning Balance | 27.1 | 25.9 | 26.1
Charge for the period | 4.0 | 4.5 | 2.5
Expenditure | (2.1) | (3.1) | (2.7)
Exchange effect | 0.3 | (0.2) | 0
Ending Balance | 29.3 | 27.1 | 25.9
Due within one year | (5.0) | (3.6) | (3.3)
Balance at December 31 | $ 24.3 | $ 23.5 | $ 22.6

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