Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (4.9)us-gaap_NetIncomeLoss	$ 0.4us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	67.3	57.6
Amortization of aerial image library, deferred contract costs and lease incentive	4.5	5.0
Non-cash stock-based compensation expense, net of capitalized stock-based compensation expense	4.6us-gaap_ShareBasedCompensation	3.9us-gaap_ShareBasedCompensation
Amortization of debt issuance costs and accretion of debt discount, net of capitalized interest	1.7dgi_InterestExpenseAndOther
Deferred income taxes	(5.9)	3.8
Excess tax benefit from share-based compensation	(0.9)
Other	0.4us-gaap_OtherNoncashIncomeExpense	1.2us-gaap_OtherNoncashIncomeExpense
Changes in working capital, net of assets acquired and liabilities assumed in business combinations:
Accounts receivable, net	3.6	0.1
Deferred contract costs	(4.8)	(0.4)
Other current and non-current assets	4.8	6.7
Accounts payable	5.8	(12.1)
Accrued liabilities	0.5	(12.7)
Deferred revenue	(19.8)	(13.6)
Net cash flows provided by operating activities	56.9	39.9
CASH FLOWS FROM INVESTING ACTIVITIES:
Construction in progress additions	(30.1)	(61.8)
Property and equipment additions	(1.2)	(2.2)
Acquisition of businesses, net of cash acquired		(35.7)
Decrease in restricted cash		2.0
Net cash flows used in investing activities	(31.3)	(97.7)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of debt	(1.4)us-gaap_RepaymentsOfSeniorDebt	(1.4)us-gaap_RepaymentsOfSeniorDebt
Principal payments on capital lease obligations	(0.2)	(0.2)
Repurchase of common stock	(31.1)
Proceeds from exercise of stock options	4.3	1.8
Preferred stock dividend payment	(1.0)	(1.0)
Excess tax benefit from share-based compensation	0.9
Net cash flows used in financing activities	(28.5)	(0.8)
Net decrease in cash and cash equivalents	(2.9)	(58.6)
Cash and cash equivalents, beginning of period	117.8	229.1
Cash and cash equivalents, end of period	114.9	170.5
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest, net of capitalized amounts of $11.5 million and $21.1 million, respectively	9.6us-gaap_InterestPaidNet
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Changes to non-cash property, equipment and construction in progress accruals, including interest	3.2	12.0
Non-cash preferred stock dividend accrual	$ (1.0)dgi_PreferredDividendsAccruedNotYetPaid	$ (1.0)dgi_PreferredDividendsAccruedNotYetPaid

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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