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Goodwill (Tables) | 9 Months Ended
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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 |
____________________ (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.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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