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Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions | Jul. 31, 2019 | Jan. 31, 2019
--- | --- | ---
Cash equivalents |  |
Amortized Cost | $ 923.9 | $ 886.0
Short-term trading securities |  |
Convertible debt securities, Amortized Cost |  | 4.6
Convertible debt securities, Gross unrealized gains |  | 1.9
Convertible debt securities, Gross unrealized losses |  | (2.1)
Convertible debt securities, Fair Value |  | 4.4
Derivative contract assets, Amortized Cost | 2.2 | 1.7
Derivative contract assets, Gross unrealized gains | 11.3 | 8.6
Derivative contract assets, Gross unrealized losses | (1.9) | (1.8)
Derivative contract assets | 11.6 | 8.5
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 | (5.9) | (7.4)
Derivative contract liabilities | (5.9) | (7.4)
Amortized Cost | 470.9 | 445.2
Gross unrealized gains | 18.9 | 15.3
Gross unrealized losses | (7.8) | (11.3)
Fair Value | 482.0 | 449.2
Level 1 |  |
Short-term trading securities |  |
Convertible debt securities, Fair Value |  | 0.0
Derivative contract assets | 0.0 | 0.0
Derivative contract liabilities | 0.0 | 0.0
Fair Value | 433.3 | 345.2
Level 2 |  |
Short-term trading securities |  |
Convertible debt securities, Fair Value |  | 0.0
Derivative contract assets | 11.0 | 7.7
Derivative contract liabilities | (5.9) | (7.4)
Fair Value | 48.1 | 98.8
Level 3 |  |
Short-term trading securities |  |
Convertible debt securities, Fair Value |  | 4.4
Derivative contract assets | 0.6 | 0.8
Derivative contract liabilities | 0.0 | 0.0
Fair Value | 0.6 | 5.2
Commercial paper |  |
Cash equivalents |  |
Amortized Cost | 32.0 | 87.9
Fair Value | 32.0 | 87.9
Commercial paper | Level 1 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Commercial paper | Level 2 |  |
Cash equivalents |  |
Fair Value | 32.0 | 87.9
Commercial paper | Level 3 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Certificates of deposit |  |
Cash equivalents |  |
Amortized Cost |  | 1.0
Fair Value |  | 1.0
Certificates of deposit | Level 1 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Certificates of deposit | Level 2 |  |
Cash equivalents |  |
Fair Value |  | 1.0
Certificates of deposit | Level 3 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Agency discount notes |  |
Cash equivalents |  |
Amortized Cost | 10.0 |
Fair Value | 10.0 |
Agency discount notes | Level 1 |  |
Cash equivalents |  |
Fair Value | 0.0 |
Agency discount notes | Level 2 |  |
Cash equivalents |  |
Fair Value | 10.0 |
Agency discount notes | Level 3 |  |
Cash equivalents |  |
Fair Value | 0.0 |
Corporate debt securities |  |
Cash equivalents |  |
Amortized Cost |  | 5.0
Fair Value |  | 5.0
Corporate debt securities | Level 1 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Corporate debt securities | Level 2 |  |
Cash equivalents |  |
Fair Value |  | 5.0
Corporate debt securities | Level 3 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Other |  |
Cash equivalents |  |
Amortized Cost | 1.9 |
Fair Value | 1.9 |
Other | Level 1 |  |
Cash equivalents |  |
Fair Value | 0.9 |
Other | Level 2 |  |
Cash equivalents |  |
Fair Value | 1.0 |
Other | Level 3 |  |
Cash equivalents |  |
Fair Value | 0.0 |
Custody cash deposit |  |
Cash equivalents |  |
Amortized Cost |  | 0.8
Fair Value |  | 0.8
Custody cash deposit | Level 1 |  |
Cash equivalents |  |
Fair Value |  | 0.8
Custody cash deposit | Level 2 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Custody cash deposit | Level 3 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Money market funds |  |
Cash equivalents |  |
Amortized Cost | 365.0 | 281.4
Fair Value | 365.0 | 281.4
Money market funds | Level 1 |  |
Cash equivalents |  |
Fair Value | 365.0 | 281.4
Money market funds | Level 2 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Money market funds | Level 3 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Other |  |
Marketable securities: |  |
Amortized Cost |  | 6.2
Gross Unrealized Gains |  | 1.1
Gross Unrealized Losses |  | 0.0
Fair Value |  | 7.3
Other | Level 1 |  |
Marketable securities: |  |
Fair Value |  | 2.7
Other | Level 2 |  |
Marketable securities: |  |
Fair Value |  | 4.6
Other | Level 3 |  |
Marketable securities: |  |
Fair Value |  | 0.0
Mutual funds |  |
Short-term trading securities |  |
Amortized Cost | 59.8 | 56.6
Gross Unrealized Gains | 7.6 | 3.7
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 67.4 | 60.3
Mutual funds | Level 1 |  |
Short-term trading securities |  |
Fair Value | 67.4 | 60.3
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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