Income Taxes - Reconciliation of the Liability for Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Reconciliation of the liability for unrecognized tax benefits | |||
| Balance as of beginning of the year | $ 10.0 | $ 16.3 | $ 18.5 |
| Additions for current year tax positions | 1.4 | 0.3 | 0.2 |
| Additions for prior year tax positions | 0.9 | 1.0 | 1.2 |
| Reductions for prior year tax positions | (0.2) | (4.0) | (0.2) |
| Reductions related to expirations of statute of limitations | (4.3) | (2.8) | (2.5) |
| Foreign currency translation | (1.1) | (0.8) | (0.9) |
| Balance as of the end of the year | $ 6.7 | $ 10.0 | $ 16.3 |