Goodwill (Tables)

9 Months Ended

Oct. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

The following table summarizes the changes in the carrying amount of goodwill for the nine months ended October 31, 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 and measurement period adjustments (1)	(7.2		)
Balance as of October 31, 2019	$	2,443.6

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(1)     Measurement period adjustments reflect revisions made to the Company's preliminary determination of estimated fair value of assets and liabilities assumed during the nine months ending October 31, 2019.