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Summary of significant accounting policies - Share-based compensation (Details) - USD ($) $ in Millions | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Sep. 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 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 |
Options granted |  | 0 |
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 |

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- Definition The fair value of the share based compensation awards after the plan modification. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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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 + Details
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