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Discontinued Operations - Narrative (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Oct. 26, 2015	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
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		$ 1.1	$ 0.0	$ 0.4	$ 72.9	$ 1.2	$ 1.8	$ 2.4	$ (0.4)	$ 74.3	$ 5.1	$ (22.2)
Pretax loss from discontinued operations										$ 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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