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Share-based compensation - Schedule of management and director options outstanding (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	8,306,658	8,306,658	8,888,053	8,888,053
Options outstanding, weighted average exercise price (in dollars per share)	$ 13.45	$ 13.45	$ 13.43	$ 13.43
Management and director options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in shares)	8,306,658
Options outstanding, weighted average exercise price (in dollars per share)	$ 13.45
Remaining contractual life	1 year 2 months 12 days	2 years 2 months 12 days
Options exercisable (in shares)	8,306,658
Options exercisable, weighted average exercise price (in dollars per share)	$ 13.45
Management and director options | $10.00 - $10.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower limit (in dollars per share)	10.00
Exercise price, upper limit (in dollars per share)	$ 10.89
Options outstanding (in shares)	4,774,694
Options outstanding, weighted average exercise price (in dollars per share)	$ 10.04
Remaining contractual life	1 year 1 month 6 days
Options exercisable (in shares)	4,774,694
Options exercisable, weighted average exercise price (in dollars per share)	$ 10.04
Management and director options | $15.05 - $16.89
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower limit (in dollars per share)	15.05
Exercise price, upper limit (in dollars per share)	$ 16.89
Options outstanding (in shares)	1,800,866
Options outstanding, weighted average exercise price (in dollars per share)	$ 15.92
Remaining contractual life	1 year 3 months 18 days
Options exercisable (in shares)	1,800,866
Options exercisable, weighted average exercise price (in dollars per share)	$ 15.92
Management and director options | $20.00 - $25.05
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price, lower limit (in dollars per share)	20.00
Exercise price, upper limit (in dollars per share)	$ 25.05
Options outstanding (in shares)	1,731,098
Options outstanding, weighted average exercise price (in dollars per share)	$ 20.28
Remaining contractual life	1 year 2 months 12 days
Options exercisable (in shares)	1,731,098
Options exercisable, weighted average exercise price (in dollars per share)	$ 20.28

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Name Accounting Standards Codification
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Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
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-Topic 718
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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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