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OPERATING REVENUES - OTHER OPERATING REVENUES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Operating Revenues
Operating revenues	$ 1,643.7	$ 1,657.5	$ 5,602.7	$ 5,593.5
Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	8.0		3.4
Other operating revenues | Alternative revenues
Disaggregation of Operating Revenues
Operating revenues	(1.9)		(32.2)
Other operating revenues | Late payment charges
Disaggregation of Operating Revenues
Operating revenues	9.4		31.9
Other operating revenues | Leases
Disaggregation of Operating Revenues
Operating revenues	$ 0.5		$ 3.7

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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).

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-Publisher FASB
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