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Business and Summary of Significant Accounting Policies - Computer Equipment, Software, Furniture and Leasehold Improvements, Net (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Jan. 31, 2014
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Jan. 31, 2013
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Jan. 31, 2012
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| Property, Plant and Equipment [Abstract] | |||
| Depreciation | $ 47.2 | $ 45.6 | $ 43.7 |
| Computer hardware, at cost | 163.0 | 152.3 | |
| Computer software, at cost | 80.9 | 95.1 | |
| Leasehold improvements, land and buildings, at cost | 163.7 | 152.4 | |
| Furniture and equipment, at cost | 51.7 | 46.0 | |
| Computer software, hardware, leasehold improvements, furniture and equipment, at cost | 459.3 | 445.8 | |
| Less: Accumulated depreciation | (329.0) | (330.9) | |
| Computer software, hardware, leasehold improvements, furniture and equipment, net | 130.3 | 114.9 | |
| Write off of fully depreciated assets | $ 48.2 | ||