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Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions | Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017 | Jan. 31, 2017
--- | --- | --- | --- | ---
Cash equivalents |  |  |  |
Amortized Cost | $ 895.4 | $ 1,078.0 | $ 1,174.1 | $ 1,213.1
Marketable securities: |  |  |  |
Amortized Cost | 349.3 |  |  |
Short-term trading securities |  |  |  |
Derivative contract assets, Amortized Cost | 1.7 | 2.0 |  |
Derivative contract assets, Gross unrealized gains | 12.8 | 7.5 |  |
Derivative contract assets, Gross unrealized losses | (1.6) | (1.3) |  |
Derivative contract assets | 12.9 | 8.2 |  |
Derivative contract liabilities, Amortized Cost | 0.0 | 0.0 |  |
Derivative contract liabilities, Gross unrealized gains | 0.0 | 0.0 |  |
Derivative contract liabilities, Gross unrealized losses | (6.9) | (26.6) |  |
Derivative contract liabilities | (6.9) | (26.6) |  |
Amortized Cost | 837.0 | 1,080.2 |  |
Gross unrealized gains | 22.4 | 17.0 |  |
Gross unrealized losses | (12.2) | (29.2) |  |
Fair Value | 847.2 | 1,068.0 |  |
Other Assets |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, Amortized Cost | 7.5 | 7.5 |  |
Convertible debt securities, Gross unrealized gains | 1.4 | 0.5 |  |
Convertible debt securities, Gross unrealized losses | (2.3) | (0.2) |  |
Convertible debt securities, Fair Value | 6.6 | 7.8 |  |
Level 1 |  |  |  |
Short-term trading securities |  |  |  |
Derivative contract assets | 0.0 | 0.0 |  |
Derivative contract liabilities | 0.0 | 0.0 |  |
Fair Value | 186.6 | 392.1 |  |
Level 1 | Other Assets |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, Fair Value | 0.0 | 0.0 |  |
Level 2 |  |  |  |
Short-term trading securities |  |  |  |
Derivative contract assets | 12.0 | 7.2 |  |
Derivative contract liabilities | (6.9) | (26.6) |  |
Fair Value | 653.1 | 667.1 |  |
Level 2 | Other Assets |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, Fair Value | 0.0 | 0.0 |  |
Level 3 |  |  |  |
Short-term trading securities |  |  |  |
Derivative contract assets | 0.9 | 1.0 |  |
Derivative contract liabilities | 0.0 | 0.0 |  |
Fair Value | 7.5 | 8.8 |  |
Level 3 | Other Assets |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, Fair Value | 6.6 | 7.8 |  |
Agency bonds |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 5.0 | 5.0 |  |
Fair Value | 5.0 | 5.0 |  |
Agency bonds | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 12.5 |  |  |
Gross Unrealized Gains | 0.0 |  |  |
Gross Unrealized Losses | 0.0 |  |  |
Fair Value | 12.5 |  |  |
Agency bonds | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 12.5 | 13.7 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | (0.1) | (0.1) |  |
Fair Value | 12.4 | 13.6 |  |
Agency bonds | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 5.0 |  |
Agency bonds | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 |  |  |
Agency bonds | Level 1 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 13.6 |  |
Agency bonds | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 5.0 | 0.0 |  |
Agency bonds | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 12.5 |  |  |
Agency bonds | Level 2 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 12.4 | 0.0 |  |
Agency bonds | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Agency bonds | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 |  |  |
Agency bonds | Level 3 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Asset backed securities | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 12.1 | 13.1 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 12.1 | 13.1 |  |
Asset backed securities | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 27.1 | 36.8 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | (0.3) | (0.2) |  |
Fair Value | 26.8 | 36.6 |  |
Asset backed securities | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Asset backed securities | Level 1 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Asset backed securities | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 12.1 | 13.1 |  |
Asset backed securities | Level 2 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 26.8 | 36.6 |  |
Asset backed securities | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Asset backed securities | Level 3 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Certificates of deposit |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 11.5 | 17.4 |  |
Fair Value | 11.5 | 17.4 |  |
Certificates of deposit | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 7.7 |  |  |
Gross Unrealized Gains | 0.0 |  |  |
Gross Unrealized Losses | 0.0 |  |  |
Fair Value | 7.7 |  |  |
Certificates of deposit | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 17.4 |  |
Certificates of deposit | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 |  |  |
Certificates of deposit | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 11.5 | 0.0 |  |
Certificates of deposit | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 7.7 |  |  |
Certificates of deposit | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Certificates of deposit | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 |  |  |
Commercial paper |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 269.5 | 324.2 |  |
Fair Value | 269.5 | 324.2 |  |
Commercial paper | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 62.7 | 27.5 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 62.7 | 27.5 |  |
Commercial paper | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Commercial paper | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Commercial paper | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 269.5 | 324.2 |  |
Commercial paper | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 62.7 | 27.5 |  |
Commercial paper | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Commercial paper | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Corporate debt securities |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost |  | 5.0 |  |
Fair Value |  | 5.0 |  |
Corporate debt securities | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 64.9 | 99.4 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | (0.2) | (0.1) |  |
Fair Value | 64.7 | 99.3 |  |
Corporate debt securities | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 74.0 | 100.2 |  |
Gross Unrealized Gains | 0.1 | 0.1 |  |
Gross Unrealized Losses | (0.5) | (0.4) |  |
Fair Value | 73.6 | 99.9 |  |
Corporate debt securities | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value |  | 5.0 |  |
Corporate debt securities | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 99.3 |  |
Corporate debt securities | Level 1 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 99.9 |  |
Corporate debt securities | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value |  | 0.0 |  |
Corporate debt securities | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 64.7 | 0.0 |  |
Corporate debt securities | Level 2 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 73.6 | 0.0 |  |
Corporate debt securities | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value |  | 0.0 |  |
Corporate debt securities | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Corporate debt securities | Level 3 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Custody cash deposit |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 1.7 | 5.2 |  |
Fair Value | 1.7 | 5.2 |  |
Custody cash deposit | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 1.7 | 5.2 |  |
Custody cash deposit | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Custody cash deposit | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Municipal bonds |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 5.0 | 5.0 |  |
Fair Value | 5.0 | 5.0 |  |
Municipal bonds | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 5.0 | 9.2 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 5.0 | 9.2 |  |
Municipal bonds | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 7.7 | 12.7 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | (0.1) | (0.1) |  |
Fair Value | 7.6 | 12.6 |  |
Municipal bonds | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 5.0 |  |
Municipal bonds | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 7.7 |  |
Municipal bonds | Level 1 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 12.6 |  |
Municipal bonds | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 5.0 | 0.0 |  |
Municipal bonds | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 5.0 | 1.5 |  |
Municipal bonds | Level 2 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 7.6 | 0.0 |  |
Municipal bonds | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Municipal bonds | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Municipal bonds | Level 3 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Money market funds |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 122.9 | 278.8 |  |
Fair Value | 122.9 | 278.8 |  |
Money market funds | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 122.9 | 0.0 |  |
Money market funds | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 278.8 |  |
Money market funds | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Sovereign debt |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 5.0 | 2.0 |  |
Fair Value | 5.0 | 2.0 |  |
Sovereign debt | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 6.5 |  |  |
Gross Unrealized Gains | 0.0 |  |  |
Gross Unrealized Losses | 0.0 |  |  |
Fair Value | 6.5 |  |  |
Sovereign debt | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 2.7 | 2.8 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 2.7 | 2.8 |  |
Sovereign debt | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Sovereign debt | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 |  |  |
Sovereign debt | Level 1 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Sovereign debt | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 5.0 | 2.0 |  |
Sovereign debt | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 6.5 |  |  |
Sovereign debt | Level 2 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 2.7 | 2.8 |  |
Sovereign debt | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Sovereign debt | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 |  |  |
Sovereign debt | Level 3 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
U.S. government securities |  |  |  |
Cash equivalents |  |  |  |
Amortized Cost | 11.5 |  |  |
Fair Value | 11.5 |  |  |
U.S. government securities | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 41.4 | 37.1 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | (0.2) | 0.0 |  |
Fair Value | 41.2 | 37.1 |  |
U.S. government securities | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Amortized Cost | 5.0 | 25.5 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | (0.2) |  |
Fair Value | 5.0 | 25.3 |  |
U.S. government securities | Level 1 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 |  |  |
U.S. government securities | Level 1 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 37.1 |  |
U.S. government securities | Level 1 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 25.3 |  |
U.S. government securities | Level 2 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 11.5 |  |  |
U.S. government securities | Level 2 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 41.2 | 0.0 |  |
U.S. government securities | Level 2 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 5.0 | 0.0 |  |
U.S. government securities | Level 3 |  |  |  |
Cash equivalents |  |  |  |
Fair Value | 0.0 |  |  |
U.S. government securities | Level 3 | Marketable Securities, Short-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
U.S. government securities | Level 3 | Marketable Securities, Long-term |  |  |  |
Marketable securities: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Mutual funds |  |  |  |
Short-term trading securities |  |  |  |
Amortized Cost | 53.9 | 50.1 |  |
Gross Unrealized Gains | 8.1 | 8.9 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 62.0 | 59.0 |  |
Mutual funds | Level 1 |  |  |  |
Short-term trading securities |  |  |  |
Fair Value | 62.0 | 59.0 |  |
Mutual funds | Level 2 |  |  |  |
Short-term trading securities |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Mutual funds | Level 3 |  |  |  |
Short-term trading securities |  |  |  |
Fair Value | $ 0.0 | $ 0.0 |  |

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