Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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Goodwill Changes in the Carrying Amount of Goodwill 2 (Details) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2016 USD ($) ReportingUnits segment	Oct. 31, 2016 USD ($)	Jan. 31, 2016 USD ($)	Jan. 31, 2015 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of the period		$ 1,684.2	$ 1,605.4
Less: accumulated impairment losses, beginning of the period			(149.2)	$ (149.2)
Additions arising from acquisitions during the period		62.8	97.3
Effect of foreign currency translation, purchase accounting adjustments, and other		(40.5)	(18.5)
Goodwill, end of the period	$ 1,557.3	$ 1,557.3	$ 1,535.0
Segment Reporting Information [Line Items]
Number of reporting units \| ReportingUnits	1
Manufacturing
Segment Reporting Information [Line Items]
Number of reporting units \| segment	5