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Financial Instruments Cost and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Jan. 31, 2016
Apr. 30, 2015
Jan. 31, 2015
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents $ 1,223.4 $ 1,353.0 $ 1,182.7 $ 1,410.6
Derivative contracts, Amortized Cost [1] 1.9 1.5    
Derivative contracts, Gross unrealized gains [1] 5.3 7.8    
Derivative contracts, Gross unrealized losses [1] (10.8) (7.4)    
Derivative contracts, Fair Value [1] (3.6) 1.9    
Amortized Cost 2,266.5 2,310.6    
Gross unrealized gains 11.4 11.1    
Gross unrealized losses (12.7) (11.0)    
Fair Value 2,265.2 2,310.7    
Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Amortized Cost 41.6 38.8    
Mutual funds, Gross unrealized gains 1.9 0.4    
Mutual funds, Gross unrealized losses (0.3) (1.2)    
Mutual funds, Fair Value 43.2 38.0    
Marketable Securities, Current | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 42.3 40.0    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 (0.1)    
Marketable securities, Fair Value 42.3 39.9    
Marketable Securities, Current | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 11.1 7.3    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 11.1 7.3    
Marketable Securities, Current | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 262.4 190.3    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 262.4 190.3    
Marketable Securities, Current | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 156.7 141.1    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 156.7 141.1    
Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 369.8      
Marketable securities, Gross unrealized gains 0.2      
Marketable securities, Gross unrealized losses (0.2)      
Marketable securities, Fair Value 369.8      
Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost   377.1    
Marketable securities, Gross unrealized gains   0.1    
Marketable securities, Gross unrealized losses   (0.3)    
Marketable securities, Fair Value   376.9    
Marketable Securities, Current | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 9.6 9.7    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 9.6 9.7    
Marketable Securities, Current | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 24.0 20.1    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 24.0 20.1    
Marketable Securities, Current | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 124.8 74.6    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 124.8 74.6    
Marketable Securities, Noncurrent | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 57.2 56.8    
Marketable securities, Gross unrealized gains 0.2 0.1    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 57.4 56.9    
Marketable Securities, Noncurrent | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 56.9 36.5    
Marketable securities, Gross unrealized gains 0.1 0.1    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 57.0 36.6    
Marketable Securities, Noncurrent | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 1.8      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 1.8      
Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 293.4      
Marketable securities, Gross unrealized gains 1.1      
Marketable securities, Gross unrealized losses (0.3)      
Marketable securities, Fair Value 294.2      
Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost   320.9    
Marketable securities, Gross unrealized gains   0.3    
Marketable securities, Gross unrealized losses   (0.8)    
Marketable securities, Fair Value   320.4    
Marketable Securities, Noncurrent | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 6.8 2.9    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 6.8 2.9    
Marketable Securities, Noncurrent | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 16.2 16.9    
Marketable securities, Gross unrealized gains 0.1 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 16.3 16.9    
Marketable Securities, Noncurrent | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 105.1 98.4    
Marketable securities, Gross unrealized gains 0.3 0.3    
Marketable securities, Gross unrealized losses 0.0 (0.1)    
Marketable securities, Fair Value 105.4 98.6    
Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Convertible debt securities, Amortized Cost [2] 3.4 2.5    
Convertible debt securities, Gross unrealized gains [2] 2.2 2.0    
Convertible debt securities, Gross unrealized losses [2] (1.1) (1.1)    
Convertible debt securities, Fair Value [2] 4.5 3.4    
Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 13.4 [3] 8.5 [4]    
Cash equivalents, Fair Value 13.4 [3] 8.5 [4]    
Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 179.3 [3] 267.6 [4]    
Cash equivalents, Fair Value 179.3 [3] 267.6 [4]    
Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 185.0 [3] 106.6 [4]    
Cash equivalents, Fair Value 185.0 [3] 106.6 [4]    
Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents [3] 2.5      
Cash equivalents, Fair Value [3] 2.5      
Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 55.8 [3] 2.1 [4]    
Cash equivalents, Fair Value 55.8 [3] 2.1 [4]    
Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 208.2 [3] 382.4 [4]    
Cash equivalents, Fair Value 208.2 [3] 382.4 [4]    
Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 5.8 [3] 5.0 [4]    
Cash equivalents, Fair Value 5.8 [3] 5.0 [4]    
U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 31.5 [3] 103.0 [4]    
Cash equivalents, Fair Value 31.5 [3] 103.0 [4]    
Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value [1] 0.0 0.0    
Fair Value 1,606.0 1,594.4    
Level 1 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 43.2 38.0    
Level 1 | Marketable Securities, Current | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 42.3 39.9    
Level 1 | Marketable Securities, Current | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 1 | Marketable Securities, Current | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 262.4 190.3    
Level 1 | Marketable Securities, Current | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 1 | Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 369.8      
Level 1 | Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   376.9    
Level 1 | Marketable Securities, Current | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 9.6 9.7    
Level 1 | Marketable Securities, Current | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 1 | Marketable Securities, Current | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 124.8 74.6    
Level 1 | Marketable Securities, Noncurrent | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 57.4 56.9    
Level 1 | Marketable Securities, Noncurrent | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 1 | Marketable Securities, Noncurrent | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 1.8      
Level 1 | Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 294.2      
Level 1 | Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   320.4    
Level 1 | Marketable Securities, Noncurrent | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 6.8 2.9    
Level 1 | Marketable Securities, Noncurrent | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 1 | Marketable Securities, Noncurrent | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 105.4 98.6    
Level 1 | Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Convertible debt securities, Fair Value [2] 0.0 0.0    
Level 1 | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 13.4 [3] 8.5 [4]    
Level 1 | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 179.3 [3] 267.6 [4]    
Level 1 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 1 | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [3] 2.5      
Level 1 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 55.8 [3] 2.1 [4]    
Level 1 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 1 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 5.8 [3] 5.0 [4]    
Level 1 | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 31.5 [3] 103.0 [4]    
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value [1] (4.0) 1.6    
Fair Value 654.3 712.6    
Level 2 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Current | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Current | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 11.1 7.3    
Level 2 | Marketable Securities, Current | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Current | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 156.7 141.1    
Level 2 | Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 2 | Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   0.0    
Level 2 | Marketable Securities, Current | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Current | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 24.0 20.1    
Level 2 | Marketable Securities, Current | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Noncurrent | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Noncurrent | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 57.0 36.6    
Level 2 | Marketable Securities, Noncurrent | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 2 | Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 2 | Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   0.0    
Level 2 | Marketable Securities, Noncurrent | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Marketable Securities, Noncurrent | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 16.3 16.9    
Level 2 | Marketable Securities, Noncurrent | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Convertible debt securities, Fair Value [2] 0.0 0.0    
Level 2 | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 2 | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 2 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 185.0 [3] 106.6 [4]    
Level 2 | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [3] 0.0      
Level 2 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 2 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 208.2 [3] 382.4 [4]    
Level 2 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 2 | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value [1] 0.4 0.3    
Fair Value 4.9 3.7    
Level 3 | Marketable Securities, Current        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Current | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Current | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Current | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Current | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Marketable Securities, Current | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   0.0    
Level 3 | Marketable Securities, Current | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 $ 0.0    
Level 3 | Marketable Securities, Current | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0    
Level 3 | Marketable Securities, Current | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 $ 0.0    
Level 3 | Marketable Securities, Noncurrent | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Noncurrent | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Noncurrent | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Marketable Securities, Noncurrent | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   0.0    
Level 3 | Marketable Securities, Noncurrent | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Noncurrent | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Marketable Securities, Noncurrent | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Convertible debt securities, Fair Value [2] 4.5 3.4    
Level 3 | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3 | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3 | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [3] 0.0      
Level 3 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [3] 0.0 [4]    
Level 3 | U.S. government securities        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value $ 0.0 [3] $ 0.0 [4]    
[1] Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Condensed Consolidated Balance Sheets.
[2] Considered “available-for-sale” and included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.
[3] Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.
[4] Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.