DEBT (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Notes payable	$ 691.0	$ 713.7
Capital Lease Obligations	4.1	0
Current installments of long-term debt	12.6	23.6
Total long-term debt	678.4	690.1
Variable -Rate Go Zone Bonds [Member]
Debt Instrument [Line Items]
Interest rate	1.42%	1.72%
Notes payable	50.0	50.0
Variable-Rate Recovery Zone Bonds [Member]
Debt Instrument [Line Items]
Interest rate	1.42%	1.72%
Notes payable	103.0	103.0
Industrial Development and Environmental Improvement Obligations [Member]
Debt Instrument [Line Items]
Interest rate	0.22%	0.26%
Notes payable	2.9	2.9
2022 Notes [Member]
Debt Instrument [Line Items]
Interest rate	5.50%	5.50%
Notes payable	200.0	200.0
Notes payable due 2013 [Member]
Debt Instrument [Line Items]
Interest rate	6.50%	6.50%
Notes payable	0	11.4
Notes payable due 2016 [Member]
Debt Instrument [Line Items]
Interest rate	6.75%	6.75%
Interest rate swap	6.1	8.4
Notes payable	131.1	133.4
Notes payable due 2019 [Member]
Debt Instrument [Line Items]
Interest rate	8.875%	8.875%
Unamortized discount	0.8	0.9
Notes payable	149.2	149.1
SunBelt Notes [Member]
Debt Instrument [Line Items]
Repayments of Debt	12.2	12.2	12.2
Interest rate	7.23%	7.23%
Unamortized fair value premium	0.8	1.1
Interest rate swap	1.2	1.8
Notes payable	$ 50.7	$ 63.9