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Restructuring (Details) (Willow Creek mine in the Canadian and U.K. operations, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Restructuring
Restructuring charges	$ 7.4
Employee severance
Restructuring
Number of employees terminated	250
Restructuring charges	4.3
Contract termination
Restructuring
Restructuring charges	$ 3.0

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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