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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Operating Revenues |  |
Revenues | $ 2,286.5 | $ 2,304.5
Other operating revenues |  |
Disaggregation of Operating Revenues |  |
Revenues | (3.5) |
Other operating revenues | Alternative revenues |  |
Disaggregation of Operating Revenues |  |
Revenues | (16.1) |
Other operating revenues | Late payment charges |  |
Disaggregation of Operating Revenues |  |
Revenues | 11.4 |
Other operating revenues | Leases |  |
Disaggregation of Operating Revenues |  |
Revenues | $ 1.2 |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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