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Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions | Oct. 31, 2019 | Jan. 31, 2019
--- | --- | ---
Cash equivalents |  |
Amortized Cost | $ 956.2 | $ 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 | 2.3 | 1.7
Derivative contract assets, Gross unrealized gains | 6.7 | 8.6
Derivative contract assets, Gross unrealized losses | (2.6) | (1.8)
Derivative contract assets | 6.4 | 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 | (7.2) | (7.4)
Derivative contract liabilities | (7.2) | (7.4)
Amortized Cost | 484.0 | 445.2
Gross unrealized gains | 15.2 | 15.3
Gross unrealized losses | (9.8) | (11.3)
Fair Value | 489.4 | 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 | 446.5 | 345.2
Level 2 |  |
Short-term trading securities |  |
Convertible debt securities, Fair Value |  | 0.0
Derivative contract assets | 5.8 | 7.7
Derivative contract liabilities | (7.2) | (7.4)
Fair Value | 42.3 | 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 | 42.7 | 87.9
Fair Value | 42.7 | 87.9
Commercial paper | Level 1 |  |
Cash equivalents |  |
Fair Value | 0.0 | 0.0
Commercial paper | Level 2 |  |
Cash equivalents |  |
Fair Value | 42.7 | 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
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 | 377.3 | 281.4
Fair Value | 377.3 | 281.4
Money market funds | Level 1 |  |
Cash equivalents |  |
Fair Value | 377.3 | 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 | 8.5 | 3.7
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 68.3 | 60.3
Mutual funds | Level 1 |  |
Short-term trading securities |  |
Fair Value | 68.3 | 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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