Other Noncurrent Liabilities - Components of Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Other Liabilities Noncurrent [Abstract] | ||
| Reserve for uncertain tax positions | $ 7.3 | $ 11.8 |
| Employee benefits | 7.8 | 7.5 |
| Interest rate swap contract | 0.2 | 0.2 |
| Other | 7.1 | 4.9 |
| Total | $ 22.4 | $ 24.4 |