EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Grace
Defined Benefit Plan Disclosure [Line Items]
Company's matching contribution expense	$ 2.0
Multiemployer Plans, Pension
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit pension plans | Plan	0
Percent of total employer contributions	5.00%
Defined Contribution 401k Plan
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percentage	3.00%
Company's matching contribution expense	$ 0.7	$ 0.7
Defined Contribution 401k Plan | Grace
Defined Benefit Plan Disclosure [Line Items]
Maximum annual contribution per employee	10.00%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.10%	7.10%	7.10%
Actual return on plan assets	2.64%	2.79%
Pension contributions	$ 0.5	$ 2.6	$ 5.7
Accumulated benefit obligation	197.0	193.7
Estimated net prior service credit, net of tax, that will be recognized in net periodic pension cost in next fiscal year	0.5
Estimated net loss, net of tax, that will be recognized in net periodic pension cost in next fiscal year	4.2
Plans obligations	$ (53.9)	$ (48.4)
Discount rate	4.20%	4.50%	4.00%
Net periodic benefit cost	$ 7.3	$ 6.1	$ 3.4
Net loss, net of taxes	45.6	47.3
Unrecognized prior service credit, net of taxes	(1.8)	(2.6)
Current liabilities related to non-qualified plan and post-retirement benefits	$ 0.0	$ 0.0
Other Post-retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	0.00%	0.00%	0.00%
Estimated net prior service credit, net of tax, that will be recognized in net periodic pension cost in next fiscal year	$ 0.1
Amortization period of unrecognized gains and losses	5 years
Plans obligations	$ (11.9)	$ (12.2)
Discount rate	4.20%	4.50%	4.10%
Net periodic benefit cost	$ 0.8	$ 0.8	$ 1.0
Net loss, net of taxes	0.6	0.6
Unrecognized prior service credit, net of taxes	0.0	0.0
Current liabilities related to non-qualified plan and post-retirement benefits	1.0	0.9
Non-qualified Plan Benefits
Defined Benefit Plan Disclosure [Line Items]
Estimated net loss, net of tax, that will be recognized in net periodic pension cost in next fiscal year	0.2
Plans obligations	$ 7.4
Discount rate	3.90%
Net periodic benefit cost	$ 0.6	$ 0.1	0.1
Net loss, net of taxes	1.5
Unrecognized prior service credit, net of taxes	(0.9)
Non qualified and Post retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Current liabilities related to non-qualified plan and post-retirement benefits	$ 5.2
Deferred Profit Sharing
Defined Benefit Plan Disclosure [Line Items]
Company's matching contribution expense			$ 0.6
Deferred Profit Sharing | Minimum
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percentage	1.00%
Deferred Profit Sharing | Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percentage	5.00%