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Other disclosures - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Other Disclosures [Line Items]
Capital commitments	$ 3,230.0	$ 2,283.0
Contractual capital commitments	500.0	400.0
Contingent liabilities indemnities and other performance guarantees	166.0	317.0
Payments Under Investigation	10.5
Joint ventures
Other Disclosures [Line Items]
Capital commitments	$ 127.0	$ 116.0

X

- Definition

The amount of future capital expenditures that the entity is committed to make.

+ References

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- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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Payments Under Investigation

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