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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - Other operating revenues - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | $ 26.3 | $ (1.1) | $ 27.2 | $ (4.6)
Alternative revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 1.1 | (14.2) | (18.6) | (30.3)
Late payment charges |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | 12.0 | 11.1 | 25.2 | 22.5
Rental revenues |  |  |  |
Disaggregation of Operating Revenues |  |  |  |
Other operating revenues | $ 13.2 | $ 2.0 | $ 20.6 | $ 3.2

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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 http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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