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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Operating Revenues |  |
Other operating revenues | $ 22.4 | $ 21.7
Late payment charges |  |
Disaggregation of Operating Revenues |  |
Other operating revenues | 15.0 | 12.1
Alternative revenues |  |
Disaggregation of Operating Revenues |  |
Other operating revenues | 6.2 | 8.5
Other |  |
Disaggregation of Operating Revenues |  |
Other operating revenues | $ 1.2 | $ 1.1

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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=120395209&loc=SL114868664-224227 + Details
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