INCOME TAXES (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	$ 1.9		$ 1.0	$ 5.2
Statutory federal tax rate	35.00%	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount	$ 0.5		$ 2.9
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	4.3			$ 4.1
Income Tax Reconciliation, Prior Year Income Taxes, Salt Depletion, Amount				14.9
Income Tax Reconciliation, Prior Year Income Taxes, Non-deductible Acquisition Costs, Amount				9.7
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized Tax Benefits	$ 35.0	$ 38.0	35.0	38.0	$ 38.4	$ 35.1
Increases for prior year tax positions			4.9	5.8
Decreases for prior year tax positions			(9.2)	(1.8)
Increases for current year tax positions			2.0	1.3
Settlement with taxing authorities			(1.0)	(2.1)
Reductions due to statute of limitations			(0.1)	$ (0.3)
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount			$ 9.5