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 | $ 2,956.2 | $ 2,840.1 |
| Less: accumulated depreciation | 1,338.6 | 1,204.0 |
| Property, plant and equipment, net | 1,617.6 | 1,636.1 |
| 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 | 1,175.1 | 1,080.0 |
| Buildings [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | 185.6 | 199.5 |
| Land and Land Improvements [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | 172.6 | 176.5 |
| Construction-in-Progress [Member] | ||
| Property, plant and equipment | ||
| Property, plant and equipment, at cost | $ 114.1 | $ 84.6 |