Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of unrecognized tax benefits.

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Income Tax (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended				6 Months Ended	9 Months Ended
Income Tax (Narrative) (Details) - USD ($) $ in Millions	Nov. 15, 2016	Oct. 31, 2016	Apr. 30, 2016	Oct. 31, 2015	Jul. 31, 2015	Jul. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Provision for income taxes		$ 13.5	$ (14.4)	$ 21.3	$ 269.5	$ 272.2	$ 53.1	$ 293.5
(Loss) income before income taxes		(129.3)		$ (22.5)			(355.6)	$ 0.2
Unrecognized tax benefits		264.3					264.3
Unrecognized tax benefits that would impact effective tax rate		250.4					250.4
Foreign Tax Authority \| State Administration of Taxation, China
Income Tax Contingency [Line Items]
Income tax examination liability		$ 9.9					$ 9.9
Subsequent Event \| Foreign Tax Authority \| State Administration of Taxation, China
Income Tax Contingency [Line Items]
Payment of tax settlement	$ 9.9