Stock repurchase program (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended	180 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019
Stock repurchase program [Abstract]
Common stock repurchased (in shares)	0	0	4,044,842
Value of common stock repurchased			$ 32.1
Average purchase price of common stock repurchased (in dollars per share)			$ 7.94

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.

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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