Segments Information Regarding Operations by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Segment Reporting Information [Line Items]
Net revenue	$ 618.0	$ 555.2	$ 1,847.6	$ 1,687.3
Other Asia Pacific
Segment Reporting Information [Line Items]
Net revenue			265.5	245.2
Americas
Segment Reporting Information [Line Items]
Net revenue	230.8	208.3	659.8	612.1
Americas | U.S.
Segment Reporting Information [Line Items]
Net revenue	189.3	171.3	543.4	502.3
Americas | Other Americas
Segment Reporting Information [Line Items]
Net revenue	41.5	37.0	116.4	109.8
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Net revenue	238.2	204.4	707.2	622.4
Asia Pacific
Segment Reporting Information [Line Items]
Net revenue	149.0	142.5	480.6	452.8
Asia Pacific | Japan
Segment Reporting Information [Line Items]
Net revenue	58.0	61.9	215.1	207.6
Asia Pacific | Other Asia Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 91.0	$ 80.6