Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020
Cash equivalents
Amortized Cost	$ 1,439.8	$ 1,774.7
Short-term trading securities
Convertible debt securities, Amortized Cost	1.8	0.1
Convertible debt securities, Gross unrealized gains	0.4	0.5
Convertible debt securities, Gross unrealized losses	(0.2)	0.0
Convertible debt securities, Fair Value	2.0	0.6
Derivative contract assets, Amortized Cost	0.3	1.0
Derivative contract assets, Gross unrealized gains	14.1	9.2
Derivative contract assets, Gross unrealized losses	(0.2)	(1.3)
Derivative contract assets	14.2	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	(30.7)	(4.7)
Derivative contract liabilities	(30.7)	(4.7)
Amortized Cost	822.3	1,241.6
Gross unrealized gains	25.3	18.9
Gross unrealized losses	(31.6)	(6.1)
Fair Value	816.0	1,254.4
Level 1
Short-term trading securities
Convertible debt securities, Fair Value	0.0	0.0
Derivative contract assets	0.0	0.0
Derivative contract liabilities	0.0	0.0
Fair Value	788.0	1,205.8
Level 2
Short-term trading securities
Convertible debt securities, Fair Value	0.0	0.0
Derivative contract assets	14.2	8.9
Derivative contract liabilities	(30.7)	(4.7)
Fair Value	26.0	48.0
Level 3
Short-term trading securities
Convertible debt securities, Fair Value	2.0	0.6
Derivative contract assets	0.0	0.0
Derivative contract liabilities	0.0	0.0
Fair Value	2.0	0.6
Commercial paper
Cash equivalents
Amortized Cost	36.0	36.8
Fair Value	36.0	36.8
Commercial paper \| Level 1
Cash equivalents
Fair Value	0.0	0.0
Commercial paper \| Level 2
Cash equivalents
Fair Value	36.0	36.8
Commercial paper \| Level 3
Cash equivalents
Fair Value	0.0	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
Money market funds
Cash equivalents
Amortized Cost	712.3	1,135.5
Fair Value	712.3	1,135.5
Money market funds \| Level 1
Cash equivalents
Fair Value	712.3	1,135.5
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
Cash equivalents
Amortized Cost	2.5	2.3
Fair Value	2.5	2.3
Other \| Level 1
Cash equivalents
Fair Value	2.0	1.3
Other \| Level 2
Cash equivalents
Fair Value	0.5	1.0
Other \| Level 3
Cash equivalents
Fair Value	0.0	0.0
Commercial Paper and Municipal Bonds
Marketable securities:
Amortized Cost	6.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	6.0
Commercial Paper and Municipal Bonds \| Level 1
Marketable securities:
Fair Value	0.0
Commercial Paper and Municipal Bonds \| Level 2
Marketable securities:
Fair Value	6.0
Commercial Paper and Municipal Bonds \| Level 3
Marketable securities:
Fair Value	0.0
Mutual funds
Short-term trading securities
Amortized Cost	63.4	59.9
Gross Unrealized Gains	10.8	9.2
Gross Unrealized Losses	(0.5)	(0.1)
Fair Value	73.7	69.0
Mutual funds \| Level 1
Short-term trading securities
Fair Value	73.7	69.0
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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