Property Plant and Equipment - Schedule of Property Plant and Equipment (Detail) - USD ($) $ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | $ 2,793.0 | $ 2,661.1 |
| Less: accumulated depreciation | 1,236.5 | 1,098.7 |
| Property, plant and equipment, net | 1,556.5 | 1,562.4 |
| Chemical Manufacturing Plants [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | 1,308.8 | 1,299.5 |
| Machinery and Equipment [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | 1,080.5 | 979.9 |
| Buildings [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | 134.7 | 141.5 |
| Land and Land Improvements [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | 156.5 | 158.0 |
| Construction-in-Progress [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | $ 112.5 | $ 82.2 |