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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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