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Operating Revenues - Other Operating Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Late payment charges transferred to alternative revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues |  | $ 8.5 |
Other operating revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 80.3 | 72.4 | $ 73.8
Other operating revenues | Late payment charges |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 54.9 | 29.4 | 43.7
Other operating revenues | Alternative revenues |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | 21.2 | 38.8 | (9.6)
Other operating revenues | Other |  |  |
Disaggregation of Operating Revenues |  |  |
Other operating revenues | $ 4.2 | $ 4.2 | $ 39.7

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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 http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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