PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, plant and equipment
Property, plant and equipment, at cost	$ 2,971.6	$ 2,958.7
Less: accumulated depreciation	1,325.6	1,300.0
Property, plant and equipment, net	1,646.0	1,658.7
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	1,067.6	1,052.8
Chemical manufacturing plants
Property, plant and equipment
Property, plant and equipment, at cost	1,289.4	1,259.1
Buildings
Property, plant and equipment
Property, plant and equipment, at cost	214.7	219.9
Depletable land and land improvements
Property, plant and equipment
Property, plant and equipment, at cost	290.7	292.2
Construction-in-progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 109.2	$ 134.7