Business and Summary of Significant Accounting Policies Computer Equipment, Software, Furniture, Leasehold Improvements and the Related Accumulated Depriciaation (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Jan. 31, 2012
Property, Plant and Equipment [Line Items]
Computer hardware, at cost	$ 152.3	$ 153.3
Computer software, at cost	95.1	133.5
Leasehold improvements, land and buildings, at cost	152.4	139.5
Furniture and equipment, at cost	46.0	47.7
Property, Plant and Equipment, Gross	445.8	474.0
Less: Accumulated depreciation	(330.9)	(369.5)
Computer software, hardware, leasehold improvements, furniture and equipment, net	$ 114.9	$ 104.5