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Financial Instruments Cost and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Oct. 31, 2015
Jan. 31, 2015
Oct. 31, 2014
Jan. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents $ 1,337.5 $ 1,410.6 $ 1,345.0 $ 1,853.0
Total 1,446.4      
Derivative contracts, Amortized Cost 2.2 [1] 3.5 [2]    
Derivative contracts, Gross unrealized gains 3.2 [1] 19.5 [2]    
Derivative contracts, Gross unrealized losses (3.8) [1] (7.0) [2]    
Derivative contracts, Fair Value 1.6 [1] 16.0 [2]    
Amortized Cost 2,313.1 1,592.6    
Gross unrealized gains 8.9 26.6    
Gross unrealized losses (6.3) (9.4)    
Fair Value 2,315.7 1,609.8    
Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Amortized Cost 41.0 36.9    
Mutual funds, Gross unrealized gains 3.1 3.4    
Mutual funds, Gross unrealized losses (0.1) 0.0    
Mutual funds, Fair Value 44.0 40.3    
Short-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 59.4      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 59.4      
Short-term available-for-sale | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 202.4 101.9    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 202.4 101.9    
Short-term available-for-sale | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 176.4 258.4    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 176.4 258.4    
Short-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 374.1 148.0    
Marketable securities, Gross unrealized gains 0.1 0.1    
Marketable securities, Gross unrealized losses (0.3) (0.1)    
Marketable securities, Fair Value 373.9 148.0    
Short-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 17.4      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 17.4      
Short-term available-for-sale | U.S. treasury bills        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 47.5      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 47.5      
Short-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 3.4      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 3.4      
Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 22.4 29.2    
Marketable securities, Gross unrealized gains 0.0 0.1    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 22.4 29.3    
Short-term available-for-sale | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost   37.9    
Marketable securities, Gross unrealized gains   0.0    
Marketable securities, Gross unrealized losses   0.0    
Marketable securities, Fair Value   37.9    
Long-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 74.6 8.9    
Marketable securities, Gross unrealized gains 0.1 0.1    
Marketable securities, Gross unrealized losses (0.1) 0.0    
Marketable securities, Fair Value 74.6 9.0    
Long-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 343.6 199.4    
Marketable securities, Gross unrealized gains 0.3 0.6    
Marketable securities, Gross unrealized losses (0.9) (0.2)    
Marketable securities, Fair Value 343.0 199.8    
Long-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 24.5      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 24.5      
Long-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 35.4      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 35.4      
Long-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 2.9 13.3    
Marketable securities, Gross unrealized gains 0.0 0.1    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 2.9 13.4    
Long-term available-for-sale | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 59.6 50.6    
Marketable securities, Gross unrealized gains 0.1 0.2    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 59.7 50.8    
Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Total 2.8 [3] 4.7 [4]    
Convertible debt securities, Gross unrealized gains 2.0 [3] 2.5 [4]    
Convertible debt securities, Gross unrealized losses (1.1) [3] (2.1) [4]    
Convertible debt securities, Fair Value 3.7 [3] 5.1 [4]    
Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 323.4 [5] 258.6 [6]    
Cash equivalents, Fair Value 323.4 [5] 258.6 [6]    
Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 40.0 [5] 141.5 [6]    
Cash equivalents, Fair Value 40.0 [5] 141.5 [6]    
Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 153.6 [5] 161.0 [6]    
Cash equivalents, Fair Value 153.6 [5] 161.0 [6]    
Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 5.0 [5] 11.5 [6]    
Cash equivalents, Fair Value 5.0 11.5 [6]    
Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 283.5 [5] 127.3 [6]    
Cash equivalents, Fair Value 283.5 [5] 127.3 [6]    
Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents [5] 3.0      
Cash equivalents, Fair Value [5] 3.0      
Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents [5] 15.0      
Cash equivalents, Fair Value [5] 15.0      
Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value 0.0 [1] 0.0 [2]    
Fair Value 1,616.2 1,042.0    
Level 1 | Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 44.0 40.3    
Level 1 | Short-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 59.4      
Level 1 | Short-term available-for-sale | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 202.4 101.9    
Level 1 | Short-term available-for-sale | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 1 | Short-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 373.9 148.0    
Level 1 | Short-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 1 | Short-term available-for-sale | U.S. treasury bills        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 47.5      
Level 1 | Short-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 1 | Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 22.4 29.3    
Level 1 | Short-term available-for-sale | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   37.9    
Level 1 | Long-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 74.6 9.0    
Level 1 | Long-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 343.0 199.8    
Level 1 | Long-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 1 | Long-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 1 | Long-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 2.9 13.4    
Level 1 | Long-term available-for-sale | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 59.7 50.8    
Level 1 | Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Convertible debt securities, Fair Value 0.0 [3] 0.0 [4]    
Level 1 | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 323.4 [5] 258.6 [6]    
Level 1 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 40.0 [5] 141.5 [6]    
Level 1 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 1 | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 5.0 [5] 11.5 [6]    
Level 1 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 1 | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] 3.0      
Level 1 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] 15.0      
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value 1.1 [1] 15.1 [2]    
Fair Value 695.3 561.8    
Level 2 | Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 0.0 0.0    
Level 2 | Short-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 2 | Short-term available-for-sale | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Short-term available-for-sale | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 176.4 258.4    
Level 2 | Short-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Short-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 17.4      
Level 2 | Short-term available-for-sale | U.S. treasury bills        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 2 | Short-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 3.4      
Level 2 | Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Short-term available-for-sale | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   0.0    
Level 2 | Long-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Long-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Long-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 24.5      
Level 2 | Long-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 35.4      
Level 2 | Long-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Long-term available-for-sale | Agency bonds        
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 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 [5] 0.0 [6]    
Level 2 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 2 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 153.6 [5] 161.0 [6]    
Level 2 | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 2 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 283.5 [5] 127.3 [6]    
Level 2 | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] 0.0      
Level 2 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] 0.0      
Level 3        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value 0.5 [1] 0.9 [2]    
Fair Value 4.2 6.0    
Level 3 | Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 0.0 0.0    
Level 3 | Short-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Short-term available-for-sale | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Short-term available-for-sale | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Short-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Short-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Short-term available-for-sale | U.S. treasury bills        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Short-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Short-term available-for-sale | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value   0.0    
Level 3 | Long-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Long-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Long-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Long-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0      
Level 3 | Long-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 3 | Long-term available-for-sale | Agency bonds        
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 3.7 [3] 5.1 [4]    
Level 3 | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 3 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 3 | Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 3 | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] 0.0 [6]    
Level 3 | Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 0.0 [5] $ 0.0 [6]    
Level 3 | Agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] 0.0      
Level 3 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] $ 0.0      
[1] Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Condensed Consolidated Balance Sheets.
[2] Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Condensed Consolidated Balance Sheets.
[3] Considered “available-for-sale” and included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.
[4] Considered “available-for-sale” and included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.
[5] Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.
[6] Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.