Contracts-In-Process And Long-Term Receivables (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Contracts In Process And Long Term Receivables [Abstract]
Allowance for doubtful accounts receivable	$ 0.2	$ 0.2
Billed receivables excluding billed orbital receivables	104.5	123.2
Billed orbital receivables	3.5	2.4
Orbital receivables for satellites under construction	141.5	133.7
Unbilled receivables other than orbital receivables	$ 40.0	$ 50.3