Segments Information Regarding Operations by Geographic Area (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Segment Reporting Information [Line Items]
Net Income (Loss) Attributable to Parent	$ 64.6	$ 71.2	$ 143.5	$ 140.5
Revenue, Net	568.7	546.3	1,157.3	1,074.6
Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	198.5	191.1	406.1	372.5
Europe Middle East And Africa [Member]
Segment Reporting Information [Line Items]
Revenue, Net	209.6	211.9	434.0	426.9
Total Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	160.6	143.3	317.2	275.2
UNITED STATES [Member] | Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	160.9	151.4	326.9	294.9
Other Americas [Member] | Total Americas [Member]
Segment Reporting Information [Line Items]
Revenue, Net	37.6	39.7	79.2	77.6
JAPAN [Member] | Total Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	69.9	58.2	146.2	118.9
Other Asia Pacific [Member] | Total Asia [Member]
Segment Reporting Information [Line Items]
Revenue, Net	$ 90.7	$ 85.1	$ 171.0	$ 156.3