Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (83.4)	$ 21.9
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	165.7	86.5
Amortization of aerial image library, deferred contract costs and lease incentive	12.6	15.1
Non-cash stock compensation expense	19.9	7.2
Amortization of debt issuance costs and accretion of debt discount	3.6	2.8
Deferred income taxes	(38.1)	15.0
Write-off of debt issuance costs and debt discounts	12.8
Other	(0.3)	1.1
Changes in working capital, net of assets acquired and liabilities assumed in business combinations:
Accounts receivable, net	15.8	(9.1)
Other current and non-current assets	3.1	(9.5)
Accounts payable	(3.4)	(3.1)
Accrued liabilities	(37.4)	(0.5)
Deferred revenue	35.3	63.2
Deferred contract costs	(16.5)	(0.5)
Payment of 2011 Senior Secured debt discount	(13.8)
Net cash flows provided by operating activities	75.9	190.1
CASH FLOWS FROM INVESTING ACTIVITIES:
Construction in progress additions	(198.9)	(152.8)
Acquisition of businesses, net of cash acquired	(524.0)
Other property and equipment additions	(12.7)	(7.8)
Investment in joint venture		(0.3)
Decrease in restricted cash	4.7	6.9
Net cash flows used in investing activities	(730.9)	(154.0)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of debt	1,150.0
Repayment of debt	(483.9)	(3.8)
Preferred stock dividend payment	(2.0)
Proceeds from exercise of stock options	36.9	2.5
Tax benefit from the exercise of stock options		0.5
Payment of debt issuance costs	(36.2)
Net cash flows provided by (used in) financing activities	664.8	(0.8)
Net (decrease) increase in cash and cash equivalents	9.8	35.3
Cash and cash equivalents, beginning of period	246.2	198.5
Cash and cash equivalents, end of period	256.0	233.8
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest, net of capitalized amounts of $32.6 and $17.3, respectively		4.8
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Changes to non-cash property, equipment and construction in progress accruals, including interest	(5.0)	10.1
Issuance of shares of common and convertible preferred stock for acquisition of business	837.8
Stock-based compensation awards issued in acquisition of business, net of income taxes	13.4
Non-cash preferred stock dividend accrual	$ (1.0)