EMPLOYEE BENEFIT PLANS (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Periodic Benefit Cost
Attempted plan funded status, minimum, percentage	80.00%
Pension Benefits
Net Periodic Benefit Cost
Service cost	$ 0.7	$ 0.6	$ 0.7
Interest cost	5.8	5.4	5.6
Expected return on assets	(8.1)	(8.5)	(9.0)
Amortization of transition obligation	0.0	0.0	0.0
Amortization of settlement cost	0.0	0.0	0.0
Amortization of prior service cost	0.0	0.0	0.0
Amortization of actuarial loss	2.6	2.9	2.8
Settlement cost	0.0	0.0	0.0
Net periodic benefit cost	1.0	0.4	0.1
Estimated net actuarial (gains) loss that will be amortized from accumulated other comprehensive income into net periodic benefit cost during the 2017 fiscal year	3.5
Amortization of prior service cost/(credit) that will be amortized from accumulated other comprehensive income into net periodic benefit cost during the 2017 fiscal year	0.0
Other Benefits
Net Periodic Benefit Cost
Service cost	0.0	0.0	0.0
Interest cost	0.3	0.3	0.3
Expected return on assets	0.0	0.0	0.0
Amortization of transition obligation	0.0	0.0	0.0
Amortization of settlement cost	0.0	0.0	0.0
Amortization of prior service cost	0.0	0.1	0.3
Amortization of actuarial loss	0.1	0.2	0.1
Settlement cost	0.0	0.0	0.0
Net periodic benefit cost	0.4	$ 0.6	$ 0.7
Estimated net actuarial (gains) loss that will be amortized from accumulated other comprehensive income into net periodic benefit cost during the 2017 fiscal year	0.0
Amortization of prior service cost/(credit) that will be amortized from accumulated other comprehensive income into net periodic benefit cost during the 2017 fiscal year	$ 0.0