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Shareholders' equity (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 24, 2018
Share repurchase program, authorized amount				$ 500,000
Common shares repurchased (in shares)		0	499
Amount remaining under share repurchase authorization	$ 287,452	$ 287,452
First American Payment Systems, L.P. [Member]
Stock issued, shares	294
Stock issued, value	$ 13,000

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Number of shares of stock issued attributable to transactions classified as other.

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Value of shares of stock issued attributable to transactions classified as other.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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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