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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Operating Revenues
Revenues	$ 1,672.5	$ 1,631.5	$ 3,959.0	$ 3,936.0
Other operating revenues
Disaggregation of Operating Revenues
Revenues	(1.1)		(4.6)
Other operating revenues | Alternative revenues
Disaggregation of Operating Revenues
Revenues	(14.2)		(30.3)
Other operating revenues | Late payment charges
Disaggregation of Operating Revenues
Revenues	11.1		22.5
Other operating revenues | Leases
Disaggregation of Operating Revenues
Revenues	$ 2.0		$ 3.2

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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

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