PENSION AND POST-RETIREMENT BENEFITS - Aggregate Reconciliation of Projected Benefit Obligations, Plan Assets, Funded Status and Amounts Recognized (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in Benefit Obligation:
Benefit obligation - beginning of year	$ (640.5)
Benefit obligation - end of year	(661.4)	$ (640.5)
Change in Plan Assets:
Fair value of plan assets - beginning of year	464.0
Fair value of plan assets - end of year	497.2	464.0
Pension Plans [Member]
Change in Benefit Obligation:
Benefit obligation - beginning of year	(640.5)	(649.4)
Service cost	(3.0)	(0.5)	$ (0.7)
Interest cost	(19.6)	(20.7)	(28.6)
Actuarial gain (loss)	(22.3)	(21.6)
Curtailment gain	3.3	0.0
Other pension settlements	3.6	0.0
Benefits paid	43.2	42.8
Other	(18.4)	0.0
Contributions by plan participants	(0.7)	0.0
Foreign currency translation adjustments	(7.0)	8.9
Benefit obligation - end of year	(661.4)	(640.5)	(649.4)
Change in Plan Assets:
Fair value of plan assets - beginning of year	464.0	473.9
Actual return on plan assets	53.5	35.8
Employer contributions	7.6	7.3
Other pension settlements	(3.6)	0.0
Benefits paid	43.2	42.8
Other	(11.6)
Contributions by plan participant	0.7
Foreign currency translation adjustments	6.6	(10.2)
Fair value of plan assets - end of year	497.2	464.0	473.9
Total liability	(164.2)	(176.5)
Other Post-Retirement Benefit Plans [Member]
Change in Benefit Obligation:
Benefit obligation - beginning of year	(13.4)	(13.0)
Service cost	0.0	0.0	0.0
Interest cost	(0.4)	(0.4)	(0.5)
Actuarial gain (loss)	(1.1)	(1.0)
Curtailment gain	0.0	0.0
Other pension settlements	0.0	0.0
Benefits paid	0.9	1.0
Other	0.0	0.0
Contributions by plan participants	0.0	0.0
Foreign currency translation adjustments	0.0	0.0
Benefit obligation - end of year	(14.0)	(13.4)	(13.0)
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
Employer contributions	0.9	1.0
Other pension settlements	0.0	0.0
Benefits paid	0.9	1.0
Foreign currency translation adjustments	0.0	0.0
Fair value of plan assets - end of year	0.0	0.0	$ 0.0
Total liability	$ (14.0)	$ (13.4)