ACCOUNTS AND OTHER RECEIVABLES - Components of Accounts and Other Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current
Trade accounts receivable	$ 582.2	$ 526.1
Trade notes receivable	0.7	1.0
Total trade receivables	582.9	527.1
Other notes receivable	0.0	0.0
Insurance receivables	43.7	43.0
Taxes receivable, including income taxes	23.7	15.0
Other receivables	12.8	14.8
Subtotal other receivables	80.2	72.8
Total trade and other receivables	663.1	599.9
Allowance for doubtful accounts:
Trade accounts receivable	(4.8)	(4.7)
Trade notes receivable	(0.1)	(0.1)
Total trade receivables	(4.9)	(4.8)
Other notes receivable	0.0	0.0
Total allowance for doubtful accounts	(4.9)	(4.8)
Total receivables, net	658.2	595.1
Long-term
Trade accounts receivable	0.0	0.0
Trade notes receivable	1.0	1.2
Total trade receivables	1.0	1.2
Other notes receivable	24.7	24.7
Insurance receivables	0.0	0.0
Taxes receivable, including income taxes	0.0	0.0
Other receivables	0.0	0.0
Subtotal other receivables	24.7	24.7
Total trade and other receivables	25.7	25.9
Allowance for doubtful accounts, Long-term
Trade accounts receivable	0.0	0.0
Trade notes receivable	0.0	(0.1)
Total trade receivables	0.0	(0.1)
Other notes receivable	0.0	0.0
Total allowance for doubtful accounts	0.0	(0.1)
Total net receivables	$ 25.7	$ 25.8