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Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Restructuring
One time charges of restructuring cost	$ 7.2	$ 7.2
Restructuring costs incurred	0.1
Additional cost recorded for cancellation of outstanding stock options for certain terminated employees	0.4
Restructuring cost paid	1.5
Restructuring liability	$ 3.4	$ 4.8

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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- Definition

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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