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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The amount of goodwill reallocated from former segment (Surveillance and Intelligence) to current segments.

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The number of cash generating units.

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The period for estimate of expected revenue, earnings before interest, taxes, depreciation and amortization, and operating cash flows.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Intangible assets and goodwill - Goodwill Impairment (Details)	1 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) item	Oct. 05, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2016 USD ($)	Dec. 31, 2015 USD ($)
Goodwill impairment
Number of operating segments \| item		3
Number of cash generating units \| item		3
Goodwill		$ 2,374,400,000		$ 699,500,000	$ 697,000,000	$ 697,000,000
Impairment of goodwill	$ 0
Estimated period of return		5 years
Maximum \| Space Systems segment
Goodwill impairment
Discount rate		7.50%
Perpetual growth rate				2.00%
Maximum \| Imagery segment
Goodwill impairment
Discount rate		10.30%
Perpetual growth rate				2.00%
Maximum \| Services segment
Goodwill impairment
Discount rate		10.30%
Perpetual growth rate				3.00%
DigitalGlobe
Goodwill impairment
Goodwill		$ 1,668,900,000	$ 1,668,900,000
Goodwill reallocated from former segment (Surveillance and Intelligence) to current segments		16,500,000
DigitalGlobe \| Space Systems segment
Goodwill impairment
Goodwill		142,900,000
DigitalGlobe \| Imagery segment
Goodwill impairment
Goodwill		1,399,800,000
DigitalGlobe \| Services segment
Goodwill impairment
Goodwill		$ 126,200,000