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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 132.2 | $ 107.7 | $ 29.3
Alternative revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 79.8 | 47.0 | (30.3)
Late payment charges |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 48.5 | 56.5 | 55.6
Other |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 3.9 | $ 4.2 | $ 4.0

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