PENSION AND OTHER POST-EMPLOYMENT BENEFITS (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Pension settlement charge			$ 10.4	$ 5.2
Number of domestic defined benefit plans	2		2
Pension Benefits
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Interest cost	$ 2.5	$ 2.6	$ 7.4	7.6
Expected return on plan assets	(3.9)	(4.0)	(11.9)	(13.2)
Amortization of prior service credit	0.0	0.0	0.0	0.0
Recognized actuarial loss	0.1	0.1	0.4	0.8
Pension settlement charge	9.8	0.6	10.4	5.2
Net periodic benefit cost (credit)	8.5	(0.7)	6.3	0.4
Other Benefits
PENSIONS AND OTHER POSTRETIREMENT BENEFITS
Interest cost	(0.1)	0.0	0.1	0.1
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service credit	(0.1)	(0.2)	(0.5)	(0.5)
Recognized actuarial loss	0.0	0.0	0.0	(0.1)
Pension settlement charge	0.0	0.0	0.0	0.0
Net periodic benefit cost (credit)	$ (0.2)	$ (0.2)	$ (0.4)	$ (0.5)