Voluntary Severance Incentive Program (Details) (Employee Severance [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Employee Severance [Member]
Restructuring number of positions eliminated	55
Restructuring number of positions eliminated, percent	6.00%
Restructuring and related activities, eligible employees	919
Severance costs	$ 7.3
Severance costs payback period	1 year 4 months 24 days
Percent of applicants approved by management	50.00%

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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+ Details