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Summary of significant accounting policies - Share-based compensation (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Threshold cash return on investment upon termination event to determine vesting of performance shares		$ 1,515.0
Fair value prior to plan modification	$ 13.8
Fair value after plan modification	$ 33.0
Service-based options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Award expiration period	10 years
Performance-based options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Award expiration period	10 years
Threshold cash return on investment upon termination event to determine vesting of performance shares	$ 1,515.0

X

- Definition

The fair value of the share based compensation awards after the plan modification.

+ References

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- Definition

The fair value of the share based compensation awards prior to the plan modification.

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- Definition

The amount of threshold cash return on its investment upon a change in control of the Company ("Termination Event"), to determine the vesting and exercisability of performance shares.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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