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The amount of employee benefits recognized as of the acquisition date.

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The cash outflow to refinance debt.

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Business combinations - DigitalGlobe (Details) $ / shares in Units, $ in Millions			3 Months Ended									12 Months Ended
	Jun. 15, 2018 shares	Oct. 05, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 21, 2018 USD ($)	Oct. 04, 2017 $ / shares
Business combination
Initial draw of debt												$ 104.0	$ 3,160.0
Debt issuance costs												3.0	63.0
Accelerated share-based awards relating to post-acquisition services													33.0
Revenues			$ 496.0	$ 509.0	$ 579.0	$ 557.0		$ 545.0	$ 337.0	$ 375.0	$ 374.0	2,141.0	1,631.0	$ 1,558.0
Income before income taxes												(1,328.0)	(104.0)	67.0
Liabilities
Goodwill			$ 1,751.0				$ 2,374.0	$ 2,374.0				1,751.0	2,374.0	$ 699.0
Acquisition related costs												$ 34.0	60.0
Syndicated Credit Facility
Business combination
Aggregate principal amount															$ 3,750.0
DigitalGlobe
Business combination
Common share exchanged for cash \| $ / shares		$ 17.50
Common share exchange ratio (in shares) \| shares		0.3132
Closing price of share (in dollars per share) \| $ / shares																$ 54.57
Share issuance costs		$ 3.0
Fair value of replacement awards attributable to pre-acquisition		16.0
Fair value of replacement awards attributable to post-acquisition		$ 14.0
Number of shares owned by dissenting shareholders \| shares		80,000
Number of dissenting common shareholders		352,225
Shares issued in acquisition \| shares	2,206,464
Revenues							222.0
Income before income taxes							$ 8.0
Proforma information
Revenue													2,300.0
Summary of fair value of consideration and preliminary estimated fair value of assets acquired and liabilities assumed
Cash paid		$ 1,131.0
Shares issued		1,063.0
Merger consideration to be settled		3.0
Liability to dissenting shareholders		115.0
Issuance of replacement equity-settled awards		16.0
Purchase consideration		2,328.0
Assets
Cash and cash equivalents		171.0
Trade and other receivables		142.0
Property, plant and equipment		696.0
Intangible assets, net		1,440.0
Other assets		106.0
Total Assets		2,555.0
Liabilities
Accounts payable		83.0
Other current liabilities		4.0
Pension and other postretirement benefit liabilities		29.0
Long-term debt		1,276.0
Other liabilities		504.0
Total Liabilities		1,896.0
Business CombFair value of net identifiable assets acquiredination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total		659.0
Goodwill		1,669.0
Acquisition related costs													$ 60.0
Goodwill is deductible for income tax purposes		0.0
DigitalGlobe \| Syndicated Credit Facility
Business combination
Aggregate principal amount		3,800.0
Initial draw of debt		3,100.0
Debt issuance costs		63.0
Equity award-holders pay-out		1,200.0
Refinance debt of acquiree		1.3
Refinance debt		$ 742.0