Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Oct. 31, 2020	Jan. 31, 2020
Cash equivalents
Amortized Cost	$ 1,537.0	$ 1,774.7
Short-term trading securities
Derivative contract assets, Amortized Cost	1.8	0.1
Derivative contract assets, Gross unrealized gains	1.5	0.5
Derivative contract assets, Gross unrealized losses	(0.2)	0.0
Derivative contract assets	3.1	0.6
Amortized Cost	928.6	1,241.6
Gross unrealized gains	18.7	18.9
Gross unrealized losses	(14.6)	(6.1)
Fair Value	932.7	1,254.4
Foreign currency contracts
Short-term trading securities
Derivative contract assets, Amortized Cost	0.4	1.0
Derivative contract assets, Gross unrealized gains	6.4	9.2
Derivative contract assets, Gross unrealized losses	(0.3)	(1.3)
Derivative contract assets	6.5	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	(13.7)	(4.7)
Derivative contract liabilities	(13.7)	(4.7)
Level 1
Short-term trading securities
Derivative contract assets	0.0	0.0
Fair Value	896.3	1,205.8
Level 1 \| Foreign currency contracts
Short-term trading securities
Derivative contract assets	0.0	0.0
Derivative contract liabilities	0.0	0.0
Level 2
Short-term trading securities
Derivative contract assets	0.0	0.0
Fair Value	33.3	48.0
Level 2 \| Foreign currency contracts
Short-term trading securities
Derivative contract assets	6.5	8.9
Derivative contract liabilities	(13.7)	(4.7)
Level 3
Short-term trading securities
Derivative contract assets	3.1	0.6
Fair Value	3.1	0.6
Level 3 \| Foreign currency contracts
Short-term trading securities
Derivative contract assets	0.0	0.0
Derivative contract liabilities	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
Commercial paper
Cash equivalents
Amortized Cost	34.0	36.8
Fair Value	34.0	36.8
Commercial paper \| Level 1
Cash equivalents
Fair Value	0.0	0.0
Commercial paper \| Level 2
Cash equivalents
Fair Value	34.0	36.8
Commercial paper \| Level 3
Cash equivalents
Fair Value	0.0	0.0
Money market funds
Cash equivalents
Amortized Cost	817.8	1,135.5
Fair Value	817.8	1,135.5
Money market funds \| Level 1
Cash equivalents
Fair Value	817.8	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	6.5	2.3
Fair Value	6.5	2.3
Other \| Level 1
Cash equivalents
Fair Value	4.0	1.3
Other \| Level 2
Cash equivalents
Fair Value	2.5	1.0
Other \| Level 3
Cash equivalents
Fair Value	0.0	0.0
Commercial Paper and Municipal Bonds
Marketable securities:
Amortized Cost	4.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	4.0
Commercial Paper and Municipal Bonds \| Level 1
Marketable securities:
Fair Value	0.0
Commercial Paper and Municipal Bonds \| Level 2
Marketable securities:
Fair Value	4.0
Commercial Paper and Municipal Bonds \| Level 3
Marketable securities:
Fair Value	0.0
Mutual funds
Short-term trading securities
Amortized Cost	64.1	59.9
Gross Unrealized Gains	10.8	9.2
Gross Unrealized Losses	(0.4)	(0.1)
Fair Value	74.5	69.0
Mutual funds \| Level 1
Short-term trading securities
Fair Value	74.5	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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