Financial Instruments (Cost and Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Jan. 31, 2019
Cash equivalents
Amortized Cost	$ 883.2	$ 886.0
Marketable securities:
Amortized Cost	25.3
Short-term trading securities
Convertible debt securities, Amortized Cost	1.1	4.6
Convertible debt securities, Gross unrealized gains	0.4	1.9
Convertible debt securities, Gross unrealized losses	0.0	(2.1)
Convertible debt securities, Fair Value	1.5	4.4
Derivative contract assets, Amortized Cost	2.2	1.7
Derivative contract assets, Gross unrealized gains	9.5	8.6
Derivative contract assets, Gross unrealized losses	(2.0)	(1.8)
Derivative contract assets	9.7	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	(5.4)	(7.4)
Derivative contract liabilities	(5.4)	(7.4)
Amortized Cost	454.4	445.2
Gross unrealized gains	17.1	15.3
Gross unrealized losses	(7.4)	(11.3)
Fair Value	464.1	449.2
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	380.2	345.2
Level 2
Short-term trading securities
Convertible debt securities, Fair Value	0.0	0.0
Derivative contract assets	9.1	7.7
Derivative contract liabilities	(5.4)	(7.4)
Fair Value	81.8	98.8
Level 3
Short-term trading securities
Convertible debt securities, Fair Value	1.5	4.4
Derivative contract assets	0.6	0.8
Derivative contract liabilities	0.0	0.0
Fair Value	2.1	5.2
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	57.2	87.9
Fair Value	57.2	87.9
Marketable securities:
Amortized Cost	19.9
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Fair Value	19.9
Commercial paper \| Level 1
Cash equivalents
Fair Value	0.0	0.0
Marketable securities:
Fair Value	0.0
Commercial paper \| Level 2
Cash equivalents
Fair Value	57.2	87.9
Marketable securities:
Fair Value	19.9
Commercial paper \| Level 3
Cash equivalents
Fair Value	0.0	0.0
Marketable securities:
Fair Value	0.0
Common stock
Marketable securities:
Amortized Cost	2.6
Gross Unrealized Gains	0.1
Gross Unrealized Losses	0.0
Fair Value	2.7
Common stock \| Level 1
Marketable securities:
Fair Value	2.7
Common stock \| Level 2
Marketable securities:
Fair Value	0.0
Common stock \| Level 3
Marketable securities:
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	2.0
Fair Value	2.0
Other \| Level 1
Cash equivalents
Fair Value	1.0
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	310.2	281.4
Fair Value	310.2	281.4
Money market funds \| Level 1
Cash equivalents
Fair Value	310.2	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	59.2	56.6
Gross Unrealized Gains	7.1	3.7
Gross Unrealized Losses	0.0	0.0
Fair Value	66.3	60.3
Mutual funds \| Level 1
Short-term trading securities
Fair Value	66.3	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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