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Retirement Plans Schedule of Weighted Average Assumptions Used Calculate Net Periodic Pension Costs (Details) (United Kingdom Subsidiary, UK Plan)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United Kingdom Subsidiary \| UK Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.70%	5.30%	5.60%
Annual rate of return on plan assets	6.70%	6.70%	7.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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