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Long-term Debt - Cresques Japanese Financing (Details) - USD ($) $ in Millions	Mar. 20, 2023	Mar. 13, 2023	Apr. 23, 2020	Apr. 21, 2020	Jun. 20, 2023
Cresques Japanese Financing
Long-term Debt
Repayment of debt	$ 15.0			$ 28.5
Value of vessel transferred			$ 71.5
Term of charter agreement			12 years
Proceeds from sale of vessel			$ 52.5
Deposit retained by buyer used for purchase payment			$ 19.0
Monthly brokerage commission (as a percent)			1.25%
Percentage of broker commission fee payable			0.50%
Monthly principal payments on debt	0.1		$ 0.3
Loan term period			12 years
Balloon payment			$ 11.5
Fees incurred on prepayment of debt	$ 0.1
Cresques Japanese Financing \| LIBOR
Long-term Debt
Description of variable rate basis			one-month LIBOR plus a margin of 2.5%
Margin added to base interest rate under debt facility			2.50%
Addendum to Cresques Japanese Financing \| SOFR
Long-term Debt
Description of variable rate basis		one-month SOFR
Increase in interest rate from switch from LIBOR to SOFR		0.11448%
Second Addendum to Cresques Japanese Financing
Long-term Debt
Fixed interest rate					6.55%