ENVIRONMENTAL (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Environmental Remediation Obligations [Abstract]
Reserves for future environmental expenditures - total	$ 136.6	$ 139.2	$ 137.3
Reserves for environmental expenditures - noncurrent	119.6	120.2	$ 120.3
Environmental Remediation Expense	$ 2.6	$ 2.7