Pensions and Postretirement Benefits (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Aug. 31, 2016 |
Aug. 31, 2015 |
Aug. 31, 2016 |
Aug. 31, 2015 |
|
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Service costs incurred | $ 0.4 | $ 0.6 | $ 0.9 | $ 1.5 | |
| Interest costs on projected benefit obligation | 2.2 | 2.1 | 6.4 | 6.3 | |
| Expected return on plan assets | (2.1) | (2.2) | (6.4) | (6.6) | |
| Net periodic pension expense | 0.5 | 0.5 | 0.9 | 1.2 | |
| United States Postretirement Benefit Plan of US Entity [Member] | |||||
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Service costs incurred | 0.0 | 0.0 | 0.0 | 0.0 | |
| Interest costs on projected benefit obligation | 0.1 | 0.1 | 0.3 | 0.3 | |
| Net periodic pension expense | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.3 | |
| Subsequent Event [Member] | |||||
| Defined Benefit Plan Disclosure [Line Items] | |||||
| Pension contributions | $ 3.0 | ||||