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Plant Closure Provisions (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Movements in the provisions |  |  |
Total at January 1 | $ 28.6 | $ 27.5 |
Charge | 1.3 | 1.2 |
Expenditure | (1.6) | (1.6) |
Exchange effect | 0 | 0.3 |
Total at June 30 | 28.3 | 27.4 |
Due within one year | (3.3) | (4.0) | (4.1)
Balance at June 30 | 25.0 | 23.4 | 24.5
Severance [Member] |  |  |
Movements in the provisions |  |  |
Total at January 1 | 1.5 |  |
Charge | 0.1 |  |
Expenditure | (0.6) |  |
Exchange effect | 0 |  |
Total at June 30 | 1.0 |  |
Due within one year | 0 |  |
Balance at June 30 | 1.0 |  |
Remediation [Member] |  |  |
Movements in the provisions |  |  |
Total at January 1 | 27.1 |  |
Charge | 1.2 |  |
Expenditure | (1.0) |  |
Exchange effect | 0 |  |
Total at June 30 | 27.3 |  |
Due within one year | (3.3) |  |
Balance at June 30 | $ 24.0 |  |

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