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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 29.3 | $ 80.3 | $ 72.4
Late payment charges |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 55.6 | 54.9 | 29.4
Alternative revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | (30.3) | 21.2 | 38.8
Other |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 4.0 | $ 4.2 | $ 4.2

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- Definition Amount of revenue that is not accounted for under Topic 606. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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