COMMITMENTS AND CONTINGENCIES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Future minimum operating leases [Abstract]
2012	$ 40.3
2013	36.6
2014	31.3
2015	27.2
2016	23.1
Thereafter	63.2
Total operating leases	221.7
Future minimum purchase commitments [Abstract]
2012	105.9
2013	55.9
2014	16.8
2015	14.7
2016	0.8
Thereafter	0
Total purchase commitments	194.1
Total rent expense charged to operations	53.8	51.2	45.4
Long-term Purchase Commitment [Line Items]
Length of brine and pipeline purchase agreement with PetroLogistics (in years)				twenty
Fixed annual payment over the life of the contract for the use of the pipeline	2.0
Amount of the minimum usage requirement for brine over the first five-year period of the contract	8.4
Amount of buy out provision exercisable by Company after first five-year period	12.0
Annual obligation vendor has to deliver sulfur dioxide (in tons)	36,000
Monthly payment Company is obligated to make to vendor for sulfur dioxide regardless of the quantity purchased	0.2
Commitment Company is obligated to pay vendor in 2012	0.6
Loss Contingencies [Line Items]
Legal action liabilities	$ 16.4	$ 18.1