Plant Closure Provisions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Movements in plant closure and restructuring provisions
Total at January 1	$ 30.4	$ 28.6
Charge for the period	0.6	0.7
Expenditure	(0.6)	(1.2)
Exchange effect	0	0.1
Closing balance at March 31	30.4	28.2
Due within one year	(4.2)	(3.3)	(5.1)
Due after one year	26.2	24.9	25.3
Severance [Member]
Movements in plant closure and restructuring provisions
Total at January 1	1.1
Charge for the period	0
Expenditure	(0.1)
Exchange effect	0
Closing balance at March 31	1.0
Due within one year	0
Due after one year	1.0
Remediation [Member]
Movements in plant closure and restructuring provisions
Total at January 1	29.3
Charge for the period	0.6
Expenditure	(0.5)
Exchange effect	0
Closing balance at March 31	29.4
Due within one year	(4.2)
Due after one year	$ 25.2

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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- Definition

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

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- Definition

Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost.

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