EMPLOYEE BENEFIT PLANS - Components of net periodic benefit cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1.6	$ 0.4	$ 0.1
Interest cost	9.5	10.8	4.5
Expected return on plan assets	(14.5)	(14.7)	(5.9)
Amortization of net loss (gain)	0.0	0.0	0.0
Curtailment gain recognized	0.0	0.0	0.0
Amortization of prior service credit	0.0	0.0	0.0
Settlement loss (gain) recognized	0.0	0.9	(0.1)
Other	0.0	0.0	0.0
Net periodic (benefit) cost	(3.4)	(2.6)	(1.4)
Non-U.S. defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	3.1	3.9	2.2
Interest cost	6.0	8.3	3.7
Expected return on plan assets	(7.3)	(7.7)	(3.1)
Amortization of net loss (gain)	1.0	(0.2)	0.0
Curtailment gain recognized	0.0	(1.6)	0.0
Amortization of prior service credit	(0.6)	0.0	0.0
Settlement loss (gain) recognized	1.7	0.2	0.6
Other	0.3	0.2	0.0
Net periodic (benefit) cost	4.2	3.1	3.4
U.S. postretirement benefit plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.9	1.7	0.9
Interest cost	2.2	2.3	1.6
Expected return on plan assets	(0.2)	(0.5)	(0.3)
Amortization of net loss (gain)	0.0	0.0	0.0
Curtailment gain recognized	0.0	0.0	0.0
Amortization of prior service credit	(2.5)	(2.5)	0.0
Settlement loss (gain) recognized	0.0	0.0	0.0
Other	0.0	0.0	0.0
Net periodic (benefit) cost	$ 1.4	$ 1.0	$ 2.2