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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 SS/L Phantom SARs [Member]	Dec. 31, 2011 SS/L Phantom SARs [Member]	Mar. 31, 2011 SS/L Phantom SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for future grant under Stock Incentive Plan	1,302,622
Stock-based compensation liability			$ 0.9	$ 4.6
Stock compensation, cash payments			3.9		4.3
Total stock-based compensation	$ 0.5	$ 1.5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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