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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jan. 31, 2021 | Jan. 31, 2020
--- | --- | ---
Cash equivalents: |  |
Cash equivalents, amortized cost | $ 1,772.2 | $ 1,774.7
Short-term trading securities |  |
Derivative contract assets, amortized cost | 0.1 | 0.1
Derivative contract assets, gross unrealized gains | 0.4 | 0.5
Derivative contract assets, gross unrealized losses | (0.3) | 0.0
Derivative contract assets, fair value | 0.2 | 0.6
Amortized cost | 796.3 | 1,241.6
Gross unrealized gains | 26.7 | 18.9
Gross unrealized losses | (18.2) | (6.1)
Fair value | 804.8 | 1,254.4
Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, amortized cost | 0.4 | 1.0
Derivative contract assets, gross unrealized gains | 9.8 | 9.2
Derivative contract assets, gross unrealized losses | (0.4) | (1.3)
Derivative contract assets, fair value | 9.8 | 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 | (17.5) | (4.7)
Derivative contract liabilities, fair value | (17.5) | (4.7)
Level 1 |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 0.0 | 0.0
Fair value | 771.9 | 1,205.8
Level 1 | Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 0.0 | 0.0
Derivative contract liabilities, fair value | 0.0 | 0.0
Level 2 |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 0.0 | 0.0
Fair value | 32.7 | 48.0
Level 2 | Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 9.8 | 8.9
Derivative contract liabilities, fair value | (17.5) | (4.7)
Level 3 |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 0.2 | 0.6
Fair value | 0.2 | 0.6
Level 3 | Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, fair value |  | 0.0
Derivative contract liabilities, fair value | 0.0 | 0.0
Agency bonds |  |
Cash equivalents: |  |
Cash equivalents, amortized cost |  | 6.0
Cash equivalents, fair value |  | 6.0
Agency bonds | Level 1 |  |
Cash equivalents: |  |
Cash equivalents, fair value |  | 0.0
Agency bonds | Level 2 |  |
Cash equivalents: |  |
Cash equivalents, fair value |  | 6.0
Agency bonds | Level 3 |  |
Cash equivalents: |  |
Cash equivalents, fair value |  | 0.0
Commercial paper |  |
Cash equivalents: |  |
Cash equivalents, amortized cost | 36.0 | 36.8
Cash equivalents, fair value | 36.0 | 36.8
Commercial paper | Level 1 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0.0 | 0.0
Commercial paper | Level 2 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 36.0 | 36.8
Commercial paper | Level 3 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0.0 | 0.0
Money market funds |  |
Cash equivalents: |  |
Cash equivalents, amortized cost | 686.9 | 1,135.5
Cash equivalents, fair value | 686.9 | 1,135.5
Money market funds | Level 1 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 686.9 | 1,135.5
Money market funds | Level 2 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0.0 | 0.0
Money market funds | Level 3 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0.0 | 0.0
Other |  |
Cash equivalents: |  |
Cash equivalents, amortized cost | 4.4 | 2.3
Cash equivalents, fair value | 4.4 | 2.3
Other | Level 1 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 4.0 | 1.3
Other | Level 2 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0.4 | 1.0
Other | Level 3 |  |
Cash equivalents: |  |
Cash equivalents, fair value | 0.0 | 0.0
Commercial paper and municipal bonds |  |
Short-term available-for-sale |  |
Amortized Cost | 4.0 |
Short-term available-for-sale, gross unrealized gains |  |
Short-term available-for-sale, gross unrealized losses | 0.0 |
Short-term available-for-sale, fair value | 4.0 |
Commercial paper and municipal bonds | Level 1 |  |
Short-term available-for-sale |  |
Short-term available-for-sale, fair value |  |
Commercial paper and municipal bonds | Level 2 |  |
Short-term available-for-sale |  |
Short-term available-for-sale, fair value | 4.0 |
Commercial paper and municipal bonds | Level 3 |  |
Short-term available-for-sale |  |
Short-term available-for-sale, fair value | 0.0 |
Mutual funds |  |
Short-term trading securities |  |
Short-term trading securities, amortized cost | 64.5 | 59.9
Short-term trading securities, gross unrealized gain | 16.5 | 9.2
Short-term trading securities, gross unrealized losses | 0.0 | (0.1)
Short-term trading securities, fair value | 81.0 | 69.0
Mutual funds | Level 1 |  |
Short-term trading securities |  |
Short-term trading securities, fair value | 81.0 | 69.0
Mutual funds | Level 2 |  |
Short-term trading securities |  |
Short-term trading securities, fair value | 0.0 | 0.0
Mutual funds | Level 3 |  |
Short-term trading securities |  |
Short-term trading securities, fair value | $ 0.0 | $ 0.0

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