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Business and Summary of Significant Accounting Policies - Other Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Amortization of intangible assets |  | $ 33.2 | $ 39.8 | $ 36.5
Developed technologies, at cost |  | 571.4 | 538.4 |
Customer relationships, trade names, patents, and user lists, at cost | [1] | 371.6 | 348.9 |
Other intangible assets, at cost | [2] | 943.0 | 887.3 |
Less: Accumulated amortization |  | (796.2) | (715.4) |
Other intangible assets, net |  | $ 146.8 | 171.9 |
Weighted average useful life |  | 4 years 2 months 12 days |  |
Customer Relationships, Trade Names, Patents, and User List |  |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |  |
Amortization of intangible assets |  | $ 82.6 | $ 92.9 | $ 80.7
Customer Relationships, Trade Names, Patents, and User List | Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 1 year |  |
Customer Relationships, Trade Names, Patents, and User List | Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |  |
[1] | Included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.
[2] | Includes the effects of foreign currency translation.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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