Common stock - Narratives (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended	14 Months Ended
	Jan. 31, 2025	Jun. 30, 2025	Jun. 30, 2025	May 14, 2024
Open Market Sale (ATM Agreement)
Shares issued		0	2,030,431
Offering price of shares				$ 200.0
Percentage of commission				3.00%
Gross proceeds from issuance of common shares			$ 20.0
Net proceeds from issuance of common stock			19.6
Value of shares available for future issuance		$ 180.0	$ 180.0
Public offering
Shares issued	22,258,064
Share price	$ 7.75
Net proceeds from issuance of common stock	$ 161.7