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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | --- | --- | ---
Cash equivalents: |  |  |  |
Amortized Cost | $ 1,774.7 | $ 886.0 | $ 1,078.0 | $ 1,213.1
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 | 1.1 | 1.7 |  |
Derivative contract assets, gross unrealized gains | 9.7 | 8.6 |  |
Derivative contract assets, gross unrealized losses | (1.3) | (1.8) |  |
Derivative contract assets, fair value | 9.5 | 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 | (4.7) | (7.4) |  |
Derivative contract liabilities, fair value | (4.7) | (7.4) |  |
Amortized cost | 1,241.6 | 445.2 |  |
Gross unrealized gains | 18.9 | 15.3 |  |
Gross unrealized losses | (6.1) | (11.3) |  |
Fair value | 1,254.4 | 449.2 |  |
Level 1 |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, fair value |  | 0.0 |  |
Derivative contract assets, fair value | 0.0 | 0.0 |  |
Derivative contract liabilities, fair value | 0.0 | 0.0 |  |
Fair value | 1,205.8 | 345.2 |  |
Level 2 |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, fair value |  | 0.0 |  |
Derivative contract assets, fair value | 8.9 | 7.7 |  |
Derivative contract liabilities, fair value | (4.7) | (7.4) |  |
Fair value | 48.0 | 98.8 |  |
Level 3 |  |  |  |
Short-term trading securities |  |  |  |
Convertible debt securities, fair value |  | 4.4 |  |
Derivative contract assets, fair value | 0.6 | 0.8 |  |
Derivative contract liabilities, fair value | 0.0 | 0.0 |  |
Fair value | 0.6 | 5.2 |  |
Other Debt Obligations |  |  |  |
Cash equivalents: |  |  |  |
Amortized Cost | 2.3 |  |  |
Fair Value | 2.3 |  |  |
Other Debt Obligations | Marketable Securities, Current |  |  |  |
Available-for-sale |  |  |  |
Amortized Cost |  | 6.2 |  |
Gross Unrealized Gains |  | 1.1 |  |
Gross Unrealized Losses |  | 0.0 |  |
Fair Value |  | 7.3 |  |
Other Debt Obligations | Level 1 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 1.3 |  |  |
Other Debt Obligations | Level 1 | Marketable Securities, Current |  |  |  |
Available-for-sale |  |  |  |
Fair Value |  | 2.7 |  |
Other Debt Obligations | Level 2 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 1.0 |  |  |
Other Debt Obligations | Level 2 | Marketable Securities, Current |  |  |  |
Available-for-sale |  |  |  |
Fair Value |  | 4.6 |  |
Other Debt Obligations | Level 3 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 0.0 |  |  |
Other Debt Obligations | Level 3 | Marketable Securities, Current |  |  |  |
Available-for-sale |  |  |  |
Fair Value |  | 0.0 |  |
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 |  |  |
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 |  |
Commercial paper |  |  |  |
Cash equivalents: |  |  |  |
Amortized Cost | 36.8 | 87.9 |  |
Fair Value | 36.8 | 87.9 |  |
Commercial paper | Level 1 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Commercial paper | Level 2 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 36.8 | 87.9 |  |
Commercial paper | Level 3 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 0.0 | 0.0 |  |
Money market funds |  |  |  |
Cash equivalents: |  |  |  |
Amortized Cost | 1,135.5 | 281.4 |  |
Fair Value | 1,135.5 | 281.4 |  |
Money market funds | Level 1 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value | 1,135.5 | 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 |  |
Mutual funds |  |  |  |
Short-term trading securities |  |  |  |
Amortized Cost | 59.9 | 56.6 |  |
Gross Unrealized Gains | 9.2 | 3.7 |  |
Gross Unrealized Losses | (0.1) | 0.0 |  |
Fair Value | 69.0 | 60.3 |  |
Mutual funds | Level 1 |  |  |  |
Short-term trading securities |  |  |  |
Fair Value | 69.0 | 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 |  |
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 |  |
Deposits |  |  |  |
Cash equivalents: |  |  |  |
Amortized Cost |  | 0.8 |  |
Fair Value |  | 0.8 |  |
Deposits | Level 1 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value |  | 0.8 |  |
Deposits | Level 2 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value |  | 0.0 |  |
Deposits | Level 3 |  |  |  |
Cash equivalents: |  |  |  |
Fair Value |  | $ 0.0 |  |

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