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Financial Instruments Cost and Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jul. 31, 2015
Jan. 31, 2015
Jul. 31, 2014
Jan. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents $ 1,473.1 $ 1,410.6 $ 1,323.1 $ 1,853.0
Total 1,438.1      
Derivative contracts, Amortized Cost 2.9 [1] 3.5 [2]    
Derivative contracts, Gross unrealized gains 4.5 [1] 19.5 [2]    
Derivative contracts, Gross unrealized losses (4.7) [1] (7.0) [2]    
Derivative contracts, Fair Value 2.7 [1] 16.0 [2]    
Amortized Cost 2,449.5 1,592.6    
Gross unrealized gains 11.0 26.6    
Gross unrealized losses (6.6) (9.4)    
Fair Value 2,453.9 1,609.8    
Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Amortized Cost 40.6 36.9    
Mutual funds, Gross unrealized gains 4.1 3.4    
Mutual funds, Gross unrealized losses 0.0 0.0    
Mutual funds, Fair Value 44.7 40.3    
Short-term available-for-sale | U.S. government agency bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 38.0      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 38.0      
Short-term available-for-sale | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 255.0 101.9    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 255.0 101.9    
Short-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 233.8 258.4    
Marketable securities, Gross unrealized gains 0.0 0.0    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 233.8 258.4    
Short-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 287.7 148.0    
Marketable securities, Gross unrealized gains 0.0 0.1    
Marketable securities, Gross unrealized losses (0.2) (0.1)    
Marketable securities, Fair Value 287.5 148.0    
Short-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 3.2      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 3.2      
Short-term available-for-sale | U.S. treasury bills        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 22.6      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 22.6      
Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 32.0 29.2    
Marketable securities, Gross unrealized gains 0.0 0.1    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 32.0 29.3    
Short-term available-for-sale | Agency bond        
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 81.6 8.9    
Marketable securities, Gross unrealized gains 0.1 0.1    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 81.7 9.0    
Long-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 340.8 199.4    
Marketable securities, Gross unrealized gains 0.2 0.6    
Marketable securities, Gross unrealized losses (0.6) (0.2)    
Marketable securities, Fair Value 340.4 199.8    
Long-term available-for-sale | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 29.0      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 29.0      
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 bond        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 81.2 50.6    
Marketable securities, Gross unrealized gains 0.1 0.2    
Marketable securities, Gross unrealized losses 0.0 0.0    
Marketable securities, Fair Value 81.3 50.8    
Long-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Amortized Cost 27.2      
Marketable securities, Gross unrealized gains 0.0      
Marketable securities, Gross unrealized losses 0.0      
Marketable securities, Fair Value 27.2      
Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Total 3.1 [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 4.0 [3] 5.1 [4]    
Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 277.3 [5] 258.6 [6]    
Cash equivalents, Fair Value 277.3 [5] 258.6 [6]    
Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 20.0 [5] 141.5 [6]    
Cash equivalents, Fair Value 20.0 [5] 141.5 [6]    
Commercial paper        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 251.5 [5] 161.0 [6]    
Cash equivalents, Fair Value 251.5 [5] 161.0 [6]    
Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 6.3 [5] 11.5 [6]    
Cash equivalents, Fair Value 6.3 11.5 [6]    
Money market funds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 402.8 [5] 127.3 [6]    
Cash equivalents, Fair Value 402.8 [5] 127.3 [6]    
Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents [5] 10.0      
Cash equivalents, Fair Value [5] 10.0      
Level 1        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value 0.0 [1] 0.0 [2]    
Fair Value 1,499.7 1,042.0    
Level 1 | Short-term available-for-sale        
Schedule of Available-for-sale Securities [Line Items]        
Mutual funds, Fair Value 44.7 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 38.0      
Level 1 | Short-term available-for-sale | Certificates of deposit        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 255.0 101.9    
Level 1 | Short-term available-for-sale | Sovereign debt        
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 287.5 148.0    
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 22.6      
Level 1 | Short-term available-for-sale | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 32.0 29.3    
Level 1 | Short-term available-for-sale | Agency bond        
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 81.7 9.0    
Level 1 | Long-term available-for-sale | Corporate bonds        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 340.4 199.8    
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 | 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 bond        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 81.3 50.8    
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 | 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 277.3 [5] 258.6 [6]    
Level 1 | Custody cash deposit        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value 20.0 [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 6.3 [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 | Municipal bonds        
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents, Fair Value [5] 10.0      
Level 2        
Schedule of Available-for-sale Securities [Line Items]        
Derivative contracts, Fair Value 2.0 [1] 15.1 [2]    
Fair Value 949.5 561.8    
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 | Sovereign debt        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 233.8 258.4    
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 3.2      
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 | 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 bond        
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 29.0      
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 bond        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 0.0    
Level 2 | Long-term available-for-sale | Asset backed securities        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 27.2      
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 251.5 [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 402.8 [5] 127.3 [6]    
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 0.7 [1] 0.9 [2]    
Fair Value 4.7 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 | Sovereign debt        
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 | 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 bond        
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 | 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 bond        
Schedule of Available-for-sale Securities [Line Items]        
Marketable securities, Fair Value 0.0 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 | Convertible debt securities        
Schedule of Available-for-sale Securities [Line Items]        
Convertible debt securities, Fair Value 4.0 [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 | 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.