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Accrued Liabilities (Restructuring Accrual) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Payables and Accruals [Abstract]
Restructuring charges	$ 7.5	$ 5.3

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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