Stock-based Compensation Stock option rollforward (Details) - $ / shares shares in Millions |
9 Months Ended | |
|---|---|---|
Aug. 31, 2016 |
Nov. 30, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Balance at November 30, 2015, shares | 0.0 | |
| Weighted average grant date fair value, November 30, 2015 | $ 10.47 | $ 0.00 |
| Options assumed | 46.4 | |
| Weighted average grant date fair value, options assumed | $ 10.62 | |
| Granted options | 0.0 | |
| Weighted average grant date fair value, granted options | $ 0.00 | |
| Exercised options | (3.2) | |
| Weighted average grant date fair value, exercised options | $ 12.72 | |
| Forfeited options | (0.1) | |
| Weighted average grant date fair value, forfeited options | $ 9.07 | |
| Balance at August 31, 2016, shares | 43.1 |