Stockholders' equity - Narrative (Details) - USD ($) $ in Millions				3 Months Ended	9 Months Ended
	May 22, 2024	Sep. 29, 2023	Sep. 19, 2023	Jun. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Jun. 04, 2024	May 23, 2024	May 31, 2022
Class of Stock [Line Items]
Shares issued upon conversion of convertible preferred stock (in shares)							1,575,376
Preferred dividends				$ 0.3
Share repurchase program, authorized amount								$ 237.3	$ 200.0
Treasury stock (at cost)
Class of Stock [Line Items]
Shares repurchased (in shares)					0	0
Common stock | Equity Offering
Class of Stock [Line Items]
Consideration received from sale of stock			$ 140.0
Stock issued in sale (in shares)			2,750,000
Common stock | Underwriter Option
Class of Stock [Line Items]
Consideration received from sale of stock		$ 21.0
Stock issued in sale (in shares)		412,500
Maple Acquisition
Class of Stock [Line Items]
Stock cancelled and returned in asset acquisition (in shares)	76,166