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Employee compensation plans - Schedule of Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs)	12 Months Ended
	Dec. 31, 2022 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	2,648,512
Total weighted average strike price (in dollars per share)	$ 33.58
Total weighted average remaining contractual life	3 years
Total weighted average fair value (in dollars per share)	$ 15.68
January 5, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	417,370
Strike price (in dollars per share)	$ 27.05
Remaining contractual life	5 days
Fair value (in dollars per share)	$ 15.28
January 11, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	490,016
Strike price (in dollars per share)	$ 26.45
Remaining contractual life	1 year
Fair value (in dollars per share)	$ 17.01
January 10, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	502,160
Strike price (in dollars per share)	$ 27.54
Remaining contractual life	2 years
Fair value (in dollars per share)	$ 17.47
January 11, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	606,159
Strike price (in dollars per share)	$ 32.16
Remaining contractual life	3 years
Fair value (in dollars per share)	$ 17.48
January 7, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of OARs Outstanding (in shares) | shares	632,807
Strike price (in dollars per share)	$ 49.57
Remaining contractual life	4 years
Fair value (in dollars per share)	$ 11.79

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The fair value per share of each stock appreciation rights award outstanding by grant date as of the balance sheet date.

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The remaining contractual term of the stock appreciation rights outstanding by grant date as of the balance sheet date.

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The strike price of each stock appreciation rights award outstanding.

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The weighted average fair value per share of the total stock appreciation rights outstanding as of the balance sheet date.

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The weighted average strike price of the total stock appreciation rights outstanding as of the balance sheet date.

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