Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($) $ in Millions |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 75.9 | $ 76.0 |
| Work in process | 21.1 | 32.9 |
| Finished products | 232.4 | 252.5 |
| Supplies | 57.8 | 62.2 |
| Total | $ 387.2 | $ 423.6 |