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Share capital - Schedule of Shares Redeemed Under Buyback Program (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 19, 2025	Nov. 07, 2024	Oct. 31, 2024	Sep. 25, 2024	Mar. 31, 2025	Dec. 19, 2024	Mar. 31, 2025	Dec. 31, 2024
Equity [Abstract]
Total number of shares purchased (in shares)	1,360,537	479,524	409,512	337,070	1,360,537	953,593		2,179,699
Share repurchase program, value of shares repurchased					$ 250,000		$ 250,000	$ 500,000
Average price paid per share (in USD per share)	$ 183.75	$ 221.87	$ 228.57	$ 296.67	$ 183.75	$ 209.73		$ 229.39
Approximate dollar value of shares that may yet be purchased under the program (in millions)	$ 750,000	$ 450,000	$ 556,400	$ 400,000	$ 750,000	$ 250,000	$ 750,000

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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