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Related party disclosures - Summary of Total Compensation of Key Management Personnel (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compensation of key management personnel [abstract]
Short-term employment benefits	$ 18.2	$ 21.3	$ 19.2
Contributions to defined contribution pension plans	0.5	0.6	0.8
Equity compensation benefits	13.0	10.2	7.4
Termination benefits	0.0	1.9
Total compensation of key management personnel	$ 31.7	$ 34.0	$ 27.4

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 24
-IssueDate 2018-01-01
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- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Number 24
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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

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-Name IAS
-Number 24
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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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

The amount of compensation to key management personnel in the form of termination benefits. [Refer: Termination benefits expense; Key management personnel of entity or parent [member]]

+ References

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