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Interest bearing debt, Nordea credit facility (Details) - Nordea Credit Facility [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Sep. 30, 2024
Credit Facility [Abstract]    
Frequency of periodic repayment   quarterly
Debt repayment next periodic installment payment   $ 5.9
Debt repayment final payment   40.9
Debt repayment last periodic installment payment   5.2
Uncommitted accordion available   $ 250.0
Debt prepayment before installment term $ 23.7  
SOFR + CAS [Member]    
Credit Facility [Abstract]    
Interest rate spread [1],[2]   1.90%
[1] $140.0 mill. undrawn as of September 30, 2024
[2] 3 months Credit Adjustment Spread (CAS) of 0.26%