ENVIRONMENTAL (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Environmental Remediation Obligations [Abstract]
Provisions charged to income	$ 22.0	$ 4.4	$ 23.8	$ 6.7
Recoveries for costs incurred and expensed	(4.8)	0.0	(4.8)	0.0
Environmental expense	17.2	4.4	19.0	6.7
Revision of remediation estimates resulting from agency action	20.0		20.0
Reserves for future environmental expenditures - total	144.4	132.5	144.4	132.5	$ 125.6
Reserves for future environmental expenditures - noncurrent	$ 127.4	$ 112.5	$ 127.4	$ 112.5	$ 108.6