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Restructuring Charges (Details) (USD $) In Millions	6 Months Ended
Restructuring Charges (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010
Restructuring Charges
Restructuring charges	$ 0	$ 1.5

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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