DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Interest Rate Derivatives) (Details) - Interest Rate Swap [Member] - Derivatives in Cash Flow Hedging Relationships [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Credit Valuation Adjustments	$ 0.3	$ 1.2
Contracts Maturing In 2017 [Member]
Derivative [Line Items]
Notional	$ 500.0
Average Fixed Rate (in percentage)	2.21%
Fair Value	$ 0.0	(0.3)
Contracts Maturing In 2018 [Member]
Derivative [Line Items]
Notional	$ 810.0
Average Fixed Rate (in percentage)	2.24%
Fair Value	$ (2.1)	(9.4)
Contracts Maturing In 2019 [Member]
Derivative [Line Items]
Notional	$ 620.0
Average Fixed Rate (in percentage)	2.96%
Fair Value	$ (7.8)	(7.3)
Contracts Settling Prior to Maturity - 2017 Pre Issuance Hedges [Member]
Derivative [Line Items]
Notional	$ 1,000.0
Average Fixed Rate (in percentage)	4.07%
Fair Value	$ (156.0)	(136.2)
Contracts Settling Prior to Maturity - 2018 Pre Issuance Hedges [Member]
Derivative [Line Items]
Notional	$ 350.0
Average Fixed Rate (in percentage)	3.08%
Fair Value	$ (19.4)	$ (13.1)