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Shareholders' equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Oct. 24, 2018
Stockholders' Equity Note [Abstract]
Amount remaining under share repurchase authorization	$ 287,452
Common shares repurchased (in shares)	0	0
Share repurchase program, authorized amount			$ 500,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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