Certain Relationships and Related-Party Transactions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended				1 Months Ended	6 Months Ended						1 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Apr. 01, 2011	Sep. 30, 2011 Space Systems Loral [Member]	Apr. 01, 2011 Space Systems Loral [Member]	Jan. 31, 2008 Space Systems Loral [Member] Satellite Construction Contract [Member]	Sep. 30, 2011 Space Systems Loral [Member] Satellite Construction Contract [Member]	Oct. 01, 2010 Space Systems Loral [Member] Satellite Construction Contract [Member]	Sep. 30, 2011 Space Systems Loral [Member] Beam Sharing Agreement [Member]	Oct. 01, 2010 Space Systems Loral [Member] Beam Sharing Agreement [Member]	Sep. 30, 2011 Telesat Canada [Member]	Oct. 01, 2010 Telesat Canada [Member]	Jan. 31, 2008 Beam Sharing Agreement [Member]
Certain Relationships and Related-Party Transactions (Textuals) [Abstract]
Satellite construction contract price to purchase satellite						$ 209.1							$ 57.6
Percentage of total costs under the beam sharing agreement for which Loral is responsible													15.00%
Cash Paid to Related Party							1.3	19.2			4.8	4.7
Related party transaction cash received									0.1	6.0	1.9	0
Revenue related to SS/L	0	1.5
Related party collections in excess of revenues and deferred revenues	0	0	1.4
Satellite construction contract, outstanding payables				1.3	0
Accounts receivables due from SS/L				12.2	0
Expense related to Telesat Canada											$ 1.3	$ 1.7