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Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions | Apr. 30, 2020 | Jan. 31, 2020
--- | --- | ---
Cash equivalents |  |
Amortized Cost | $ 1,389.7 | $ 1,774.7
Short-term trading securities |  |
Convertible debt securities, Amortized Cost | 0.1 | 0.1
Convertible debt securities, Gross unrealized gains | 0.4 | 0.5
Convertible debt securities, Gross unrealized losses | (0.2) | 0.0
Convertible debt securities, Fair Value | 0.3 | 0.6
Derivative contract assets, Amortized Cost | 0.2 | 1.0
Derivative contract assets, Gross unrealized gains | 12.0 | 9.2
Derivative contract assets, Gross unrealized losses | (0.1) | (1.3)
Derivative contract assets | 12.1 | 8.9
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 | (6.5) | (4.7)
Derivative contract liabilities | (6.5) | (4.7)
Amortized Cost | 797.7 | 1,241.6
Gross unrealized gains | 17.8 | 18.9
Gross unrealized losses | (8.1) | (6.1)
Fair Value | 807.4 | 1,254.4
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 | 760.5 | 1,205.8
Level 2 |  |
Short-term trading securities |  |
Convertible debt securities, Fair Value | 0.0 |
Derivative contract assets | 12.1 | 8.9
Derivative contract liabilities | (6.5) | (4.7)
Fair Value | 46.6 | 48.0
Level 3 |  |
Short-term trading securities |  |
Convertible debt securities, Fair Value | 0.3 | 0.6
Derivative contract assets | 0.0 | 0.0
Derivative contract liabilities | 0.0 | 0.0
Fair Value | 0.3 | 0.6
Agency bonds |  |
Cash equivalents |  |
Amortized Cost |  | 6.0
Fair Value |  | 6.0
Agency bonds | Level 1 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Agency bonds | Level 2 |  |
Cash equivalents |  |
Fair Value |  | 6.0
Agency bonds | Level 3 |  |
Cash equivalents |  |
Fair Value |  | 0.0
Commercial paper |  |
Cash equivalents |  |
Amortized Cost | 29.0 | 36.8
Fair Value | 29.0 | 36.8
Marketable securities: |  |
Amortized Cost | 11.0 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 11.0 |
Commercial paper | Level 1 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Marketable securities: |  |
Fair Value | 0.0 |
Commercial paper | Level 2 |  |
Cash equivalents |  |
Fair Value | 29.0 | 36.8
Marketable securities: |  |
Fair Value | 11.0 |
Commercial paper | Level 3 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Marketable securities: |  |
Fair Value | 0.0 |
Money market funds |  |
Cash equivalents |  |
Amortized Cost | 690.2 | 1,135.5
Fair Value | 690.2 | 1,135.5
Money market funds | Level 1 |  |
Cash equivalents |  |
Fair Value | 690.2 | 1,135.5
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 |  |
Cash equivalents |  |
Amortized Cost | 5.1 | 2.3
Fair Value | 5.1 | 2.3
Other | Level 1 |  |
Cash equivalents |  |
Fair Value | 4.1 | 1.3
Other | Level 2 |  |
Cash equivalents |  |
Fair Value | 1.0 | 1.0
Other | Level 3 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Mutual funds |  |
Short-term trading securities |  |
Amortized Cost | 62.1 | 59.9
Gross Unrealized Gains | 5.4 | 9.2
Gross Unrealized Losses | (1.3) | (0.1)
Fair Value | 66.2 | 69.0
Mutual funds | Level 1 |  |
Short-term trading securities |  |
Fair Value | 66.2 | 69.0
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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