Restructuring and Other Charges - Restructuring Accrual Activity (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Restructuring Cost and Reserve [Line Items] | |||
| Beginning balance | $ 1.2 | $ 1.9 | $ 1.9 |
| Restructuring charges | 2.2 | 2.4 | |
| Cash payments | (0.5) | (3.0) | (2.4) |
| Addition to reserve | 0.1 | ||
| Ending balance | 0.7 | 1.2 | 1.9 |
| Employee Related Costs [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Beginning balance | 0.5 | 1.0 | 0.4 |
| Restructuring charges | 2.2 | 2.1 | |
| Cash payments | (0.5) | (2.7) | (1.5) |
| Ending balance | 0.5 | 1.0 | |
| Tenancy and Other Costs [Member] | |||
| Restructuring Cost and Reserve [Line Items] | |||
| Beginning balance | 0.7 | 0.9 | 1.5 |
| Restructuring charges | 0.3 | ||
| Cash payments | (0.3) | (0.9) | |
| Addition to reserve | 0.1 | ||
| Ending balance | $ 0.7 | $ 0.7 | $ 0.9 |