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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)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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