PENSION AND POSTRETIREMENT PLANS PENSION AND POSTRETIREMENT PLANS, FUNDED STATUS (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Feb. 19, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	$ 119.0	$ 112.5
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	7.5	30.9	$ 32.8
Funded status of plan	(7.5)	(30.9)
Postretirement Health Coverage [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	0.8	5.2	6.3
Funded status of plan	(0.8)	(5.2)
Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	29.0	23.6	$ 29.4
Funded status of plan	(29.0)	(23.6)
Other Pension Plan, Postretirement or Supplemental Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	6.8	21.4		$ 28.9
Other Liabilities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan		(110.6)
Other Liabilities [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	(3.8)	(10.8)
Other Liabilities [Member] | Postretirement Health Coverage [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	(0.7)	(4.6)
Other Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	(28.8)	(23.4)
Other Liabilities [Member] | Other Pension Plan, Postretirement or Supplemental Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	5.8	19.6
Accrued Liabilities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan		1.9
Accrued Liabilities [Member] | Supplemental Employee Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	(3.7)	(20.1)
Accrued Liabilities [Member] | Postretirement Health Coverage [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	(0.1)	(0.6)
Accrued Liabilities [Member] | Other Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded status of plan	(0.2)	(0.2)
Accrued Liabilities [Member] | Other Pension Plan, Postretirement or Supplemental Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 1.0	$ 1.8