Restructuring Costs - Summary of Activity in Accrued Workforce Reduction (Detail) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2015 |
|
| Restructuring Cost And Reserve [Line Items] | |||||
| Workforce reduction costs accrued | $ 0.2 | $ 0.4 | $ 21.1 | $ 21.7 | |
| Amounts recognized in the balance sheet: | |||||
| Current liability | $ 5.3 | ||||
| Workforce Reduction | |||||
| Restructuring Cost And Reserve [Line Items] | |||||
| Workforce reduction costs accrued | 21.7 | ||||
| Workforce reduction costs paid | (15.9) | ||||
| Currency translation adjustments, net | (0.2) | ||||
| Accrued workforce reduction costs at December 31, 2015 | 5.6 | 5.6 | |||
| Amounts recognized in the balance sheet: | |||||
| Current liability | 5.3 | ||||
| Noncurrent liability | 0.3 | ||||
| Restructuring Reserve | $ 5.6 | $ 5.6 | $ 5.6 | ||