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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jan. 31, 2022 | Jan. 31, 2021
--- | --- | ---
Cash equivalents: |  |
Amortized Cost | $ 1,528.4 | $ 1,772.2
Short-term trading securities |  |
Derivative contract assets, amortized cost | 0.1 | 0.1
Derivative contract assets, gross unrealized gains | 0.4 | 0.4
Derivative contract assets, gross unrealized losses | (0.4) | (0.3)
Derivative contract assets, fair value | 0.1 | 0.2
Amortized cost | 779.4 | 796.3
Gross unrealized gains | 37.4 | 26.7
Gross unrealized losses | (11.7) | (18.2)
Fair value | 805.1 | 804.8
Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, amortized cost | 1.1 | 0.4
Derivative contract assets, gross unrealized gains | 17.1 | 9.8
Derivative contract assets, gross unrealized losses | (0.2) | (0.4)
Derivative contract assets, fair value | 18.0 | 9.8
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 | (10.7) | (17.5)
Derivative contract liabilities, fair value | (10.7) | (17.5)
Level 1 |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 0.0 | 0.0
Fair value | 413.9 | 771.9
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 | 391.1 | 32.7
Level 2 | Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 18.0 | 9.8
Derivative contract liabilities, fair value | (10.7) | (17.5)
Level 3 |  |
Short-term trading securities |  |
Derivative contract assets, fair value | 0.1 | 0.2
Fair value | 0.1 | 0.2
Level 3 | Foreign currency contracts |  |
Short-term trading securities |  |
Derivative contract assets, fair value |  |
Derivative contract liabilities, fair value | 0.0 | 0.0
Money market funds |  |
Cash equivalents: |  |
Amortized Cost | 302.3 | 686.9
Fair Value | 302.3 | 686.9
Money market funds | Level 1 |  |
Cash equivalents: |  |
Fair Value | 302.3 | 686.9
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
Commercial paper |  |
Cash equivalents: |  |
Amortized Cost | 54.7 | 36.0
Fair Value | 54.7 | 36.0
Commercial paper | Short-term |  |
Marketable securities: |  |
Amortized Cost | 102.9 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 102.9 |
Commercial paper | Level 1 |  |
Cash equivalents: |  |
Fair Value | 0.0 | 0.0
Commercial paper | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Commercial paper | Level 2 |  |
Cash equivalents: |  |
Fair Value | 54.7 | 36.0
Commercial paper | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 102.9 |
Commercial paper | Level 3 |  |
Cash equivalents: |  |
Fair Value | 0.0 | 0.0
Commercial paper | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
U.S. government securities |  |
Cash equivalents: |  |
Amortized Cost | 25.0 |
Fair Value | 25.0 |
U.S. government securities | Short-term |  |
Marketable securities: |  |
Amortized Cost | 12.5 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 12.5 |
U.S. government securities | Level 1 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
U.S. government securities | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
U.S. government securities | Level 2 |  |
Cash equivalents: |  |
Fair Value | 25.0 |
U.S. government securities | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 12.5 |
U.S. government securities | Level 3 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
U.S. government securities | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Custody cash deposit |  |
Cash equivalents: |  |
Amortized Cost | 17.8 | 4.4
Fair Value | 17.8 | 4.4
Custody cash deposit | Level 1 |  |
Cash equivalents: |  |
Fair Value | 17.8 | 4.0
Custody cash deposit | Level 2 |  |
Cash equivalents: |  |
Fair Value | 0.0 | 0.4
Custody cash deposit | Level 3 |  |
Cash equivalents: |  |
Fair Value | 0.0 | 0.0
Corporate debt securities |  |
Cash equivalents: |  |
Amortized Cost | 17.6 |
Fair Value | 17.6 |
Corporate debt securities | Short-term |  |
Marketable securities: |  |
Amortized Cost | 60.7 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses |  |
Fair Value | 60.7 |
Corporate debt securities | Long-term |  |
Marketable securities: |  |
Amortized Cost | 44.7 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | (0.1) |
Fair Value | 44.6 |
Corporate debt securities | Level 1 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
Corporate debt securities | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Corporate debt securities | Level 1 | Long-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Corporate debt securities | Level 2 |  |
Cash equivalents: |  |
Fair Value | 17.6 |
Corporate debt securities | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 60.7 |
Corporate debt securities | Level 2 | Long-term |  |
Marketable securities: |  |
Fair Value | 44.6 |
Corporate debt securities | Level 3 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
Corporate debt securities | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Corporate debt securities | Level 3 | Long-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Certificates of deposit |  |
Cash equivalents: |  |
Amortized Cost | 5.7 |
Fair Value | 5.7 |
Certificates of deposit | Short-term |  |
Marketable securities: |  |
Amortized Cost | 13.7 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 13.7 |
Certificates of deposit | Level 1 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
Certificates of deposit | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Certificates of deposit | Level 2 |  |
Cash equivalents: |  |
Fair Value | 5.7 |
Certificates of deposit | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 13.7 |
Certificates of deposit | Level 3 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
Certificates of deposit | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Other |  |
Cash equivalents: |  |
Amortized Cost | 4.0 |
Fair Value | 4.0 |
Marketable securities: |  |
Amortized Cost |  | 4.0
Gross Unrealized Gains |  |
Gross Unrealized Losses |  | 0.0
Fair Value |  | 4.0
Other | Short-term |  |
Marketable securities: |  |
Amortized Cost | 4.2 |
Gross Unrealized Gains |  |
Gross Unrealized Losses | 0.0 |
Fair Value | 4.2 |
Other | Long-term |  |
Marketable securities: |  |
Amortized Cost | 0.8 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 0.8 |
Other | Level 1 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
Marketable securities: |  |
Fair Value |  |
Other | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value |  |
Other | Level 1 | Long-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Other | Level 2 |  |
Cash equivalents: |  |
Fair Value | 4.0 |
Marketable securities: |  |
Fair Value |  | 4.0
Other | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 4.2 |
Other | Level 2 | Long-term |  |
Marketable securities: |  |
Fair Value | 0.8 |
Other | Level 3 |  |
Cash equivalents: |  |
Fair Value | 0.0 |
Marketable securities: |  |
Fair Value |  | 0.0
Other | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Other | Level 3 | Long-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Asset backed securities | Short-term |  |
Marketable securities: |  |
Amortized Cost | 26.3 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 26.3 |
Asset backed securities | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Asset backed securities | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 26.3 |
Asset backed securities | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Municipal bonds | Short-term |  |
Marketable securities: |  |
Amortized Cost | 11.1 |
Gross Unrealized Gains | 0.0 |
Gross Unrealized Losses | 0.0 |
Fair Value | 11.1 |
Municipal bonds | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Municipal bonds | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 11.1 |
Municipal bonds | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Common Stock | Short-term |  |
Marketable securities: |  |
Amortized Cost | 0.0 |
Gross Unrealized Gains | 4.3 |
Gross Unrealized Losses | 0.0 |
Fair Value | 4.3 |
Common Stock | Level 1 | Short-term |  |
Marketable securities: |  |
Fair Value | 4.3 |
Common Stock | Level 2 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Common Stock | Level 3 | Short-term |  |
Marketable securities: |  |
Fair Value | 0.0 |
Mutual funds |  |
Short-term trading securities |  |
Amortized Cost | 74.2 | 64.5
Gross Unrealized Gains | 15.6 | 16.5
Gross Unrealized Losses | (0.3) | 0.0
Fair Value | 89.5 | 81.0
Mutual funds | Level 1 |  |
Short-term trading securities |  |
Fair Value | 89.5 | 81.0
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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