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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 26, 2015 | Oct. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash proceeds on sale of assets | $ 131.0 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of assets | $ 23.6 |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustment to previously recorded gain |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.1
(Loss) income from discontinued operations, net of taxes |  | $ (0.1) | $ 0.2 | $ (0.2) | $ (0.1) | $ 0.8 | $ (0.1) | $ 1.2 | $ (0.1) | $ (0.1) | $ 1.8 | $ (74.3) |
Pretax income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ 2.6 | $ (123.7) |

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