Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended	0 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Satellite Matters [Member]	Sep. 30, 2012 Satellite Matters [Member]	Dec. 31, 2012 Satellite Matters [Member]	Nov. 02, 2012 Sale Of SS/L [Member]	Mar. 31, 2013 Sale Of SS/L [Member] Indemnification Agreement [Member]	Dec. 31, 2012 Sale Of SS/L [Member] Indemnification Agreement [Member]	Mar. 31, 2013 Globalstar do Brasil S.A. [Member]	Mar. 31, 2013 Globalstar do Brasil S.A. [Member] Indemnification Agreement [Member]
Contingencies And Commitments [Line Items]
Indemnification liabilities									$ 4.8	$ 4.8
Remaining indemnification liabilities related to sale of SS/L							14.8	16.5
Restructuring costs		11.8
Restructuring costs paid	0.2	8.0
Restructuring Reserve for future payments	3.6
Maximum Loss Due to Reduced Satellite Power			18
Occurence Date of Satellite Anamoly			June 1, 2012
Satellite warranty expense				6.5
Payment towards contingency pursuant to purchase agreement					$ 6.5	$ 6.5
Date indemnification liability ends			Nov. 02, 2013