Segments Information Regarding Operations by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Segment Reporting Information [Line Items]
Net revenue	$ 599.8	$ 618.0	$ 1,855.8	$ 1,847.6
Americas
Segment Reporting Information [Line Items]
Net revenue	235.8	230.8	715.5	659.8
Americas | U.S.
Segment Reporting Information [Line Items]
Net revenue	195.6	189.3	589.7	543.4
Americas | Other Americas
Segment Reporting Information [Line Items]
Net revenue	40.2	41.5	125.8	116.4
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Net revenue	225.1	238.2	696.2	707.2
Asia Pacific
Segment Reporting Information [Line Items]
Net revenue	138.9	149.0	444.1	480.6
Asia Pacific | Japan
Segment Reporting Information [Line Items]
Net revenue	49.0	58.0	164.8	215.1
Asia Pacific | Other Asia Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 89.9	$ 91.0	$ 279.3	$ 265.5