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Investment Securities - Investment in TerreStar (Details) - TerreStar Networks Inc. (TerreStar) - Exchangeable Notes - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2016
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2011
Investment disclosures        
Fair value of investments       $ 0.0
Other, net        
Investment disclosures        
Gain on investments account for at fair value   $ 5.8 $ 5.8  
Subsequent event | Other, net        
Investment disclosures        
Gain on investments account for at fair value $ 0.8