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Deferred Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	0 Months Ended
	Jun. 30, 2012	May 15, 2012 Long-term incentive program Apex Systems	Jun. 30, 2012 Long-term incentive program Apex Systems
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Proceeds from cash surrender value of life insurance policies	$ 1.5
Distributions to deferred compensation plan participants	1.2
Long-term incentive plan term		3 years
Long-term incentive program, maximum award		10.0
Long-term incentive plan accrual	$ 1.9	$ 7.9	$ 8.4

The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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