Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Share-based compensation - PSU activity (Details) - $ / shares	1 Months Ended		6 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2022
Other disclosure
Service period	3 years	1 year
2014 Plan
Other disclosure
Vesting period (in years)			4 years
Performance Share Awards \| 2014 Plan
Number of shares
Non-vested at beginning of period (in shares)			632,930
Granted (in shares)			34,700
Vested (in shares)			(77,330)
Forfeited (in shares)			(24,400)
Non-vested at end of period (in shares)	632,930		565,900
Weighted average grant-date fair value
Non-vested at beginning of period (in dollars per share)			$ 33.54
Granted (in dollars per share)			15.11
Vested (in dollars per share)			57.56
Forfeited (in dollars per share)			29.35
Non-vested at end of period (in dollars per share)	$ 33.54		$ 29.31