EMPLOYEE BENEFITS - Schedule of Changes in Benefit Obligations, Plan Assets, Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	$ 231.1
Employer contributions	90.1	$ 5.2	$ 19.4
Fair value of plan assets at end of year	284.5	231.1
Pension and other post-employment liabilities	(132.4)	(211.1)
Pension Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning benefit obligations	388.9	404.0
Service cost—benefits earned during the year	2.9	4.8	5.2
Interest cost on projected benefit obligations	13.0	15.8	14.4
Actuarial assumptions (gains)/losses	(3.0)	44.9
Settlements and curtailments	(25.9)	(74.2)
Benefits paid	(4.7)	(2.8)
Exchange rate changes	(4.6)	(3.6)
Benefit obligations at end of year	366.6	388.9	404.0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	231.1	276.1
Actual return on plan assets	(2.1)	20.7
Employer contributions	89.6	4.8
Settlements	(25.9)	(65.1)
Benefits paid	(4.7)	(2.8)
Exchange rate changes	(3.5)	(2.6)
Fair value of plan assets at end of year	284.5	231.1	276.1
Underfunded status at end of year	(82.1)	(157.8)
Other assets	3.3	1.7
Current liabilities	(1.6)	0.0
Pension and other post-employment liabilities	(83.8)	(159.5)
Balance in the consolidated balance sheet at end of year	(82.1)	(157.8)
Prior service/(benefit) and Transition Obligation	0.9	0.9
Balance in accumulated other comprehensive loss at end of year	0.9	0.9
Accumulated benefit obligation	354.9	353.4
Other Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning benefit obligations	51.6	32.6
Service cost—benefits earned during the year	1.3	0.9	1.1
Interest cost on projected benefit obligations	2.0	1.5	1.3
Actuarial assumptions (gains)/losses	(5.5)	17.2
Settlements and curtailments	0.0	0.0
Benefits paid	(0.5)	(0.4)
Exchange rate changes	(0.3)	(0.2)
Benefit obligations at end of year	48.6	51.6	32.6
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	0.5	0.4
Settlements	0.0	0.0
Benefits paid	(0.5)	(0.4)
Exchange rate changes	0.0	0.0
Fair value of plan assets at end of year	0.0	0.0	$ 0.0
Underfunded status at end of year	(48.6)	(51.6)
Other assets	0.0	0.0
Current liabilities	0.0	0.0
Pension and other post-employment liabilities	(48.6)	(51.6)
Balance in the consolidated balance sheet at end of year	(48.6)	(51.6)
Prior service/(benefit) and Transition Obligation	(0.1)	(0.2)
Balance in accumulated other comprehensive loss at end of year	(0.1)	(0.2)
Accumulated benefit obligation	$ 48.6	$ 51.6