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Operating Revenues - Other Operating Revenues (Details) - Other operating revenues - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 107.7 | $ 29.3 | $ 80.3
Late payment charges |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 56.5 | 55.6 | 54.9
Alternative revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 47.0 | (30.3) | 21.2
Other |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 4.2 | $ 4.0 | $ 4.2

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