Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Jul. 31, 2019	Jan. 31, 2019
Cash equivalents
Amortized Cost	$ 923.9	$ 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	2.2	1.7
Derivative contract assets, Gross unrealized gains	11.3	8.6
Derivative contract assets, Gross unrealized losses	(1.9)	(1.8)
Derivative contract assets	11.6	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	(5.9)	(7.4)
Derivative contract liabilities	(5.9)	(7.4)
Amortized Cost	470.9	445.2
Gross unrealized gains	18.9	15.3
Gross unrealized losses	(7.8)	(11.3)
Fair Value	482.0	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	433.3	345.2
Level 2
Short-term trading securities
Convertible debt securities, Fair Value		0.0
Derivative contract assets	11.0	7.7
Derivative contract liabilities	(5.9)	(7.4)
Fair Value	48.1	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	32.0	87.9
Fair Value	32.0	87.9
Commercial paper \| Level 1
Cash equivalents
Fair Value	0.0	0.0
Commercial paper \| Level 2
Cash equivalents
Fair Value	32.0	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
Agency discount notes
Cash equivalents
Amortized Cost	10.0
Fair Value	10.0
Agency discount notes \| Level 1
Cash equivalents
Fair Value	0.0
Agency discount notes \| Level 2
Cash equivalents
Fair Value	10.0
Agency discount notes \| 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	365.0	281.4
Fair Value	365.0	281.4
Money market funds \| Level 1
Cash equivalents
Fair Value	365.0	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	7.6	3.7
Gross Unrealized Losses	0.0	0.0
Fair Value	67.4	60.3
Mutual funds \| Level 1
Short-term trading securities
Fair Value	67.4	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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