PROPERTY, PLANT AND EQUIPMENT, NET (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment
Property, plant and equipment, at cost	$ 2,958.7	$ 1,820.3
Less: accumulated depreciation	1,300.0	1,182.6
Property, plant and equipment, net	1,658.7	637.7
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	2,311.9	1,492.6
Buildings
Property, plant and equipment
Property, plant and equipment, at cost	219.9	203.7
Depletable land and land improvements
Property, plant and equipment
Property, plant and equipment, at cost	292.2	90.4
Construction-in-progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 134.7	$ 33.6