EMPLOYEE BENEFIT PLANS - Obligations and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan | Foreign Plan
Change in projected benefit obligation:
Projected benefit obligation - beginning of year	$ 47.3	$ 46.1
Service cost	0.8	0.6	$ 0.4
Interest cost	0.7	0.7	0.8
Actuarial losses (gains)	4.5	(1.9)
Benefits paid	(2.4)	(2.5)
Recognition of plans previously accounted for as defined contribution plans	0.0	6.1
Curtailment gains	0.0	0.0	(1.1)
Foreign exchange and other	(0.9)	(1.8)
Projected benefit obligation - end of year	50.0	47.3	46.1
Change in plan assets:
Fair value of plan assets - beginning of year	6.1	0.7
Actual return on plan assets	0.3	0.0
Contributions (employer and employee)	0.6	0.3
Benefits paid	(0.3)	(0.3)
Recognition of plans previously accounted for as defined contribution plans	0.0	5.5
Foreign exchange and other	(0.1)	(0.1)
Fair value of plan assets - end of year	6.6	6.1	0.7
Funded status at year-end	(43.4)	(41.2)
Amounts recognized in the consolidated balance sheets consist of:
Accrued expenses	(2.0)	(2.0)
Other long-term liabilities	(41.4)	(39.2)
Net amount recognized	(43.4)	(41.2)
Amount recognized in accumulated other comprehensive loss (pre-tax) consists of net prior service costs	0.1	0.1
Accumulated benefit obligation	48.6	46.1
Pension Plan | United States Plan
Change in projected benefit obligation:
Projected benefit obligation - beginning of year	10.7	9.8
Service cost	0.0	1.0	0.7
Interest cost	0.2	0.3	0.3
Actuarial losses (gains)	0.7	(0.3)
Benefits paid	(6.3)	0.0
Recognition of plans previously accounted for as defined contribution plans	0.0	0.0
Curtailment gains	0.0	(0.1)	0.0
Foreign exchange and other	0.0	0.0
Projected benefit obligation - end of year	5.3	10.7	9.8
Change in plan assets:
Fair value of plan assets - beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Contributions (employer and employee)	0.0	0.0
Benefits paid	0.0	0.0
Recognition of plans previously accounted for as defined contribution plans	0.0	0.0
Foreign exchange and other	0.0	0.0
Fair value of plan assets - end of year	0.0	0.0	0.0
Funded status at year-end	(5.3)	(10.7)
Amounts recognized in the consolidated balance sheets consist of:
Accrued expenses	0.0	(6.2)
Other long-term liabilities	(5.3)	(4.5)
Net amount recognized	(5.3)	(10.7)
Amount recognized in accumulated other comprehensive loss (pre-tax) consists of net prior service costs	0.0	0.0
Accumulated benefit obligation	5.3	10.7
Other Postretirement Benefits Plan
Change in projected benefit obligation:
Projected benefit obligation - beginning of year	4.0	4.3
Service cost	0.1	0.1	0.1
Interest cost	0.2	0.2	0.1
Actuarial losses (gains)	0.4	(0.4)
Benefits paid	(0.1)	0.0
Recognition of plans previously accounted for as defined contribution plans	0.0	0.0
Curtailment gains	0.0	(0.2)	0.0
Foreign exchange and other	0.0	0.0
Projected benefit obligation - end of year	4.6	4.0	4.3
Change in plan assets:
Fair value of plan assets - beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Contributions (employer and employee)	0.0	0.0
Benefits paid	0.0	0.0
Recognition of plans previously accounted for as defined contribution plans	0.0	0.0
Foreign exchange and other	0.0	0.0
Fair value of plan assets - end of year	0.0	0.0	$ 0.0
Funded status at year-end	(4.6)	(4.0)
Amounts recognized in the consolidated balance sheets consist of:
Accrued expenses	(0.1)	(0.1)
Other long-term liabilities	(4.5)	(3.9)
Net amount recognized	(4.6)	(4.0)
Amount recognized in accumulated other comprehensive loss (pre-tax) consists of net prior service costs	0.0	0.0
Accumulated benefit obligation	$ 4.6	$ 4.0