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Operating leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Mar. 08, 2024	Jul. 31, 2022
Operating Lease, Weighted Average Remaining Lease Term	2 years 6 months
Incremental borrowing rate	4.50%
Lessor, Operating Lease, Term of Contract					24 months
Operating Lease, Option to Extend				12 months	12 months
Lease, Practical Expedients, Package [true false]	true
Operating lease cost	$ 15.1	$ 13.4	$ 6.5
Short-Term lease cost	8.2	6.8	9.0
Charter hire costs
Lease cost	22.7	19.6	15.0
General and administrative expense
Lease cost	$ 0.6	$ 0.6	$ 0.5
Time charters [Member]
Operating Lease, Weighted Average Remaining Lease Term	7 months 6 days
Lessor, Operating Lease, Term of Contract	12 months
Operating Lease, Option to Extend	6 months
Office Space [Member]
Operating Lease, Weighted Average Discount Rate, Percent	4.00%

X

- Definition

Option to extend, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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X

- Definition

The incremental borrowing rate (IBR) is the interest rate a lessee would have to pay to borrow funds to finance an asset similar to the lease's ROU asset in value, over a similar term and in a similar economic environment.

+ References

No definition available.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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- Definition

Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease.

+ References

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- Definition

Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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- Definition

Weighted average discount rate for operating lease calculated at point in time.

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- Definition

Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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