Defined Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Mar. 31, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||||
| Recognition of actuarial (losses) gains | $ (2.8) | $ (1.9) | $ (8.9) | ||
| Defined benefit plan items [Member] | Waterloo [Member] | |||||
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||||
| Recognition of actuarial (losses) gains | 6.1 | ||||
| Postretirement Benefits [Member] | |||||
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||||
| Reduction in accrued retiree benefit plans | $ (10.7) | ||||
| Prior service credits amortized over the next 8 months | 10.7 | ||||
| Recognition of actuarial (losses) gains | $ (1.0) | $ (0.9) | $ 0.1 | $ (1.9) | $ 0.1 |
| Prior service credits amortization period | 8 months | ||||