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Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Restructuring Charges [Abstract]
Restructuring charges			$ 4.8
Restructuring charges after tax			3.7
Amount of restructuring reserve spent	0.5	1.4
Restructuring reserve, ending balance	$ 0.4	$ 0.4

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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- 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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