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Shareholders’ equity - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2025
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		1,164,000
Jefferies LLC | Common Shares | Sale Agreement
Class of Stock [Line Items]
Number of shares issued under agreement (in sales)	16,499,999
Proceeds from issuance of shares under the agreement	$ 44.1

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