Segments Information Regarding Operations by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	$ 29.4	$ 72.8	$ 172.9	$ 213.3
Revenue, Net	548.0	548.6	1,705.3	1,623.2
Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	209.4	200.4	615.5	572.9
Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenue, Net	196.3	201.8	630.3	628.7
Total Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	142.3	146.4	459.5	421.6
UNITED STATES [Member] | Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	173.6	161.7	500.5	456.6
Other Americas [Member] | Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	35.8	38.7	115.0	116.3
JAPAN [Member] | Total Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	65.4	65.4	211.6	184.3
Other Asia Pacific [Member] | Total Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	$ 76.9	$ 81.0	$ 247.9	$ 237.3