Business and Summary of Significant Accounting Policies Expected Future Amortization Expense for Purchased Technologies, Customer Relationships and Trade Names (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2013
Expected Future Amortization Expense for Purcahsed Technologies, Customer Relationships and Trade Name [Abstract]
2014	$ 72.8
2015	45.0
2016	18.6
2017	4.9
2018	1.1
Thereafter	1.1
Total	$ 143.5