Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jan. 31, 2013 Geo Eye Inc
Income Taxes
Net current deferred tax asset					$ 26.8
Net noncurrent deferred tax asset					124.5
Valuation allowance					$ 2.0
Effective income tax rate	67.90%	39.70%	30.70%	42.10%
U.S. statutory federal income tax rate			35.00%
Expected effective income tax rate before discrete items			36.30%