Deferred Revenue (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Deferred revenue
Balance at the beginning of the period	$ 429.7
Deferred revenue acquired in GeoEye acquisition	12.1
Cash collections	353.8
Revenue recognized on deferred revenue	(318.5)
Balance at the end of the period	477.1
U.S. Government | Enhanced View SLA
Deferred revenue
Balance at the beginning of the period	173.4
Cash collections	187.6
Revenue recognized on deferred revenue	(170.5)
Balance at the end of the period	190.5
U.S. Government | Value Added Services
Deferred revenue
Balance at the beginning of the period	67.4
Cash collections	88.1
Revenue recognized on deferred revenue	(45.8)
Balance at the end of the period	109.7
U.S. Government | Pre-FOC Payments Related To NextView
Deferred revenue
Balance at the beginning of the period	137.2
Revenue recognized on deferred revenue	(19.1)
Balance at the end of the period	118.1
Diversified commercial | DAP
Deferred revenue
Balance at the beginning of the period	45.5
Deferred revenue acquired in GeoEye acquisition	12.1
Cash collections	46.2
Revenue recognized on deferred revenue	(51.2)
Balance at the end of the period	52.6
Diversified commercial | Other
Deferred revenue
Balance at the beginning of the period	6.2
Cash collections	31.9
Revenue recognized on deferred revenue	(31.9)
Balance at the end of the period	$ 6.2