Derivative Instruments (Narrative) (Details) - Forward Contracts [Member] - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
May 31, 2016 |
May 31, 2015 |
May 31, 2016 |
May 31, 2015 |
|
| Derivative [Line Items] | ||||
| Minimum maturity period, foreign currency derivative | 30 days | |||
| Maximum maturity period, foreign currency derivative | 1 year | |||
| Gains (losses) on foreign currency forward contracts | $ 2.3 | $ (1.2) | $ 0.8 | $ (2.5) |