Goodwill (Tables)

3 Months Ended

Apr. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

The following table summarizes the changes in the carrying amount of goodwill for the three months ended April 30, 2019:

Balance as of January 31, 2019	$	2,600.0
Less: accumulated impairment losses as of January 31, 2019	(149.2		)
Net balance as of January 31, 2019	2,450.8
Effect of foreign currency translation, measurement period adjustments, and other (1)	(4.6		)
Balance as of April 30, 2019	$	2,446.2

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(1)     Purchase accounting adjustments reflect revisions made to the Company's preliminary determination of estimated fair value of assets and liabilities assumed during the three months ended April 30, 2019.