Basis of Presentation (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jan. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, net	$ 511.3	$ 199.3
Marketable securities	1.4	4.0
Prepaid and other current assets	263.3	206.2
Long-term other assets	478.9	375.9
Total current assets	$ 1,546.0	2,625.5
Intangible Assets Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, net		199.3
Long-term other assets		375.9
Total assets		7,279.8
Investment Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Marketable securities		4.0
Prepaid and other current assets		206.2
Long-term other assets		486.6
Total current assets		2,625.5
Total assets		7,279.8
Previously Reported | Intangible Assets Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, net		88.6
Long-term other assets		486.6
Total assets		7,279.8
Previously Reported | Investment Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Marketable securities		85.0
Prepaid and other current assets		198.9
Long-term other assets		412.9
Total current assets		2,699.2
Total assets		7,279.8
Effect of Changes in Presentation | Intangible Assets Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible assets, net		110.7
Long-term other assets		(110.7)
Total assets		0.0
Effect of Changes in Presentation | Investment Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Marketable securities		(81.0)
Prepaid and other current assets		7.3
Long-term other assets		73.7
Total current assets		(73.7)
Total assets		$ 0.0