Net Income Per Common Share - Calculations of Basic and Diluted Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended |
6 Months Ended |
Apr. 30, 2018 |
Apr. 30, 2017 |
Apr. 30, 2018 |
Apr. 30, 2017 |
| Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items] |
|
|
|
|
| Income from continuing operations |
$ 25.4
|
$ 31.6
|
$ 53.3
|
$ 47.7
|
| Income (loss) from discontinued operations, net of taxes |
1.2
|
(0.4)
|
1.1
|
(73.2)
|
| Net income (loss) |
$ 26.6
|
$ 31.3
|
$ 54.4
|
$ (25.5)
|
| Weighted-average common and common equivalent shares outstanding - Basic (in shares) |
66.0
|
56.0
|
66.0
|
56.0
|
| Effect of dilutive securities |
|
|
|
|
| Weighted-average common and common equivalent shares outstanding - Diluted (in shares) |
66.2
|
56.5
|
66.3
|
56.6
|
| Net income (loss) per common share — Basic |
|
|
|
|
| Income from continuing operations (in usd per share) |
$ 0.38
|
$ 0.56
|
$ 0.81
|
$ 0.85
|
| Loss from discontinued operations (in usd per share) |
0.02
|
(0.01)
|
0.02
|
(1.31)
|
| Net income (loss) (in usd per share) |
0.40
|
0.56
|
0.83
|
(0.46)
|
| Net income (loss) per common share — Diluted |
|
|
|
|
| Income from continuing operations (in usd per share) |
0.38
|
0.56
|
0.80
|
0.84
|
| Loss from discontinued operations (in usd per share) |
0.02
|
(0.01)
|
0.02
|
(1.29)
|
| Net income (loss) (in usd per share) |
$ 0.40
|
$ 0.55
|
$ 0.82
|
$ (0.45)
|
| Restricted stock units |
|
|
|
|
| Effect of dilutive securities |
|
|
|
|
| Effect of dilutive securities (in shares) |
0.1
|
0.3
|
0.1
|
0.2
|
| Stock options |
|
|
|
|
| Effect of dilutive securities |
|
|
|
|
| Effect of dilutive securities (in shares) |
0.1
|
0.2
|
0.1
|
0.3
|
| Performance shares |
|
|
|
|
| Effect of dilutive securities |
|
|
|
|
| Effect of dilutive securities (in shares) |
0.0
|
0.0
|
0.0
|
0.1
|