PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, plant and equipment
Property, plant and equipment, at cost	$ 3,070.4	$ 2,958.7
Less: accumulated depreciation	1,404.7	1,300.0
Property, plant and equipment, net	1,665.7	1,658.7
Chemical manufacturing plants
Property, plant and equipment
Property, plant and equipment, at cost	1,469.9	1,361.7
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	1,127.3	1,070.4
Buildings
Property, plant and equipment
Property, plant and equipment, at cost	202.8	214.4
Land and land improvements
Property, plant and equipment
Property, plant and equipment, at cost	185.7	195.3
Construction-in-progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 84.7	$ 116.9