Goodwill (Tables)

6 Months Ended

Jul. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

The following table summarizes the changes in the carrying amount of goodwill for the six months ended July 31, 2018:

Balance as of January 31, 2018	$	1,769.4
Less: accumulated impairment losses as of January 31, 2018	(149.2		)
Net balance as of January 31, 2018	1,620.2
Additions arising from acquisitions during the period	71.9
Effect of foreign currency translation	(33.4		)
Balance as of July 31, 2018	$	1,658.7