Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Inventory Disclosure [Abstract] | ||
| Raw materials | $ 68.7 | $ 75.9 |
| Work in process | 22.3 | 21.1 |
| Finished products | 195.7 | 232.4 |
| Supplies | 56.8 | 57.8 |
| Total | $ 343.5 | $ 387.2 |