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Business and Summary of Significant Accounting Policies - Computer Equipment, Software, Furniture and Leasehold Improvements, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014
Property, Plant and Equipment [Abstract] |  |  |
Depreciation | $ 60.6 | $ 52.1 | $ 47.2
Computer hardware, at cost | 202.7 | 194.0 |
Computer software, at cost | 85.6 | 84.9 |
Leasehold improvements, land, and buildings, at cost | 202.9 | 176.3 |
Furniture and equipment, at cost | 59.0 | 53.0 |
Computer software, hardware, leasehold improvements, furniture, and equipment, at cost | 550.2 | 508.2 |
Less: Accumulated depreciation | (380.9) | (349.0) |
Computer software, hardware, leasehold improvements, furniture, and equipment, net | $ 169.3 | $ 159.2 |
Software and Software Development Costs |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Useful Life | 3 years |  |
Minimum |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Useful Life | 3 years |  |
Maximum |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Useful Life | 5 years |  |

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- Definition Carrying amount at the balance sheet date of long-lived, depreciable assets that include building structures held for productive use including any addition, improvement, or renovation to the structure as well as the addition of improvements to assets held under lease arrangements. + References No definition available. + Details
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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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