DEBT (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Notes payable	$ 713.7	$ 536.4
Current installments of long-term debt	23.6	12.2
Total long-term debt	690.1	524.2
Variable -Rate Go Zone Bonds [Member]
Debt Instrument [Line Items]
Interest rate	1.72%	1.78%
Notes payable	50.0	50.0
Variable-Rate Recovery Zone Bonds [Member]
Debt Instrument [Line Items]
Interest rate	1.72%	1.78%
Notes payable	103.0	103.0
2022 Notes [Member]
Debt Instrument [Line Items]
Interest rate	5.50%
Notes payable	200.0	0
Notes payable due 2013 [Member]
Debt Instrument [Line Items]
Interest rate	6.50%	6.50%
Notes payable	11.4	11.4
Notes payable due 2016 [Member]
Debt Instrument [Line Items]
Interest rate	6.75%	6.75%
Interest rate swap	8.4	10.5
Notes payable	133.4	135.5
Notes payable due 2019 [Member]
Debt Instrument [Line Items]
Interest rate	8.875%	8.875%
Unamortized discount	0.9	1.0
Notes payable	149.1	149.0
SunBelt Notes [Member]
Debt Instrument [Line Items]
Interest rate	7.23%	7.23%
Unamortized fair value premium	1.1	1.6
Interest rate swap	1.8	1.9
Notes payable	63.9	76.6
Industrial Development and Environmental Improvement Obligations [Member]
Debt Instrument [Line Items]
Interest rate	0.26%	0.67%
Interest rate swap		0.3
Notes payable	$ 2.9	$ 10.9