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Long-Term Debt - Revolvers - Additional Information (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) vessel credit_facility | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |
Line of credit facility, borrowing capacity, reduction for remainder of year | $ 169.1 |
Line of credit facility, borrowing capacity, reduction in year two | 233.3 |
Line of credit facility, borrowing capacity, reduction in year three | $ 124.4 |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate on debt | 0.60% |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate on debt | 3.25% |
Line of Credit |  |
Debt Instrument [Line Items] |  |
Number Of Vessels | vessel | 2 |
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Number of credit facilities | credit_facility | 1 |
Revolving Credit Facilities |  |
Debt Instrument [Line Items] |  |
Line Of Credit Reduction Of Available Borrowing Capacity in Year One | $ 330.4 |
Revolving Credit Facilities | Line of Credit |  |
Debt Instrument [Line Items] |  |
Number of credit facilities | credit_facility | 2 |
Line of credit facility, maximum borrowing capacity | $ 330.4 | $ 354.8
Undrawn amount of revolving credit facilities | $ 225.4 | $ 254.8
Revolving Credit Facilities | Line of Credit | LIBOR | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate on debt | 1.40% |
Revolving Credit Facilities | Line of Credit | LIBOR | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate on debt | 2.25% |

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