Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Commitments And Contingencies Disclosure [Abstract] | ||
| Unamortized liability | $ 27.5 | $ 26.6 |
| X | ||||||||||
- Definition Unamortized fuel cost liability. No definition available.
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| X | ||||||||||
- References No definition available.
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