Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Apr. 30, 2021	Jan. 31, 2021
Cash equivalents
Amortized Cost	$ 923.2	$ 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	(0.3)	(0.3)
Derivative contract assets	0.2	0.2
Amortized Cost	246.5	796.3
Gross unrealized gains	31.0	26.7
Gross unrealized losses	(11.2)	(18.2)
Fair Value	266.3	804.8
Foreign exchange contracts
Short-term trading securities
Derivative contract assets, Amortized Cost	0.4	0.4
Derivative contract assets, Gross unrealized gains	9.4	9.8
Derivative contract assets, Gross unrealized losses	(0.2)	(0.4)
Derivative contract assets	9.6	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	(10.7)	(17.5)
Level 1
Short-term trading securities
Derivative contract assets	0.0	0.0
Fair Value	266.7	771.9
Level 1 \| Foreign exchange 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	(0.6)	32.7
Level 2 \| Foreign exchange contracts
Short-term trading securities
Derivative contract assets	9.6	9.8
Derivative contract liabilities	(10.7)	(17.5)
Level 3
Short-term trading securities
Derivative contract assets	0.2	0.2
Fair Value	0.2	0.2
Level 3 \| Foreign exchange contracts
Short-term trading securities
Derivative contract assets	0.0	0.0
Derivative contract liabilities	0.0	0.0
Commercial paper
Cash equivalents
Amortized Cost		36.0
Fair Value		36.0
Commercial paper \| Level 1
Cash equivalents
Fair Value		0.0
Commercial paper \| Level 2
Cash equivalents
Fair Value		36.0
Commercial paper \| Level 3
Cash equivalents
Fair Value		0.0
Money market funds
Cash equivalents
Amortized Cost	174.5	686.9
Fair Value	174.5	686.9
Money market funds \| Level 1
Cash equivalents
Fair Value	174.5	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
Other
Cash equivalents
Amortized Cost	1.5	4.4
Fair Value	1.5	4.4
Other \| Level 1
Cash equivalents
Fair Value	1.0	4.0
Other \| Level 2
Cash equivalents
Fair Value	0.5	0.4
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	70.0	64.5
Gross Unrealized Gains	21.2	16.5
Gross Unrealized Losses	0.0	0.0
Fair Value	91.2	81.0
Mutual funds \| Level 1
Short-term trading securities
Fair Value	91.2	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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