EMPLOYEE BENEFIT PLANS - Schedule of Reconciliations of Pension Plan Investments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 146.2
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	143.1	$ 146.2
Pension Benefits
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	146.2	160.8
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	143.1	146.2
Private Equity
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.2
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	0.1	0.2
Insurance
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.2
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	0.1	0.2
Significant Un-observable Inputs (Level 3)
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.4
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	0.2	0.4
Significant Un-observable Inputs (Level 3) | Pension Benefits
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.4	1.7
Actual return on plan assets [Abstract]
Assets held at the reporting date	(0.2)	0.0
Assets sold during the period		(1.3)
Fair value of plan assets at end of year	0.2	0.4
Significant Un-observable Inputs (Level 3) | Private Equity
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.2
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	0.1	0.2
Significant Un-observable Inputs (Level 3) | Private Equity | Pension Benefits
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.2	0.3
Actual return on plan assets [Abstract]
Assets held at the reporting date	(0.1)	(0.1)
Assets sold during the period		0.0
Fair value of plan assets at end of year	0.1	0.2
Significant Un-observable Inputs (Level 3) | Insurance
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.2
Actual return on plan assets [Abstract]
Fair value of plan assets at end of year	0.1	0.2
Significant Un-observable Inputs (Level 3) | Insurance | Pension Benefits
Change in plan assets [Roll Forward]
Fair value of plan assets at beginning of year	0.2	1.4
Actual return on plan assets [Abstract]
Assets held at the reporting date	(0.1)	0.1
Assets sold during the period		(1.3)
Fair value of plan assets at end of year	$ 0.1	$ 0.2