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Interest and Other Expense, net (Tables)
 12 Months Ended
Jan. 31, 2019
Other Income and Expenses [Abstract]  
Interest and Other Income, net Interest and other expense, net, consists of the following:
 
Fiscal Year Ended January 31,
 
2019
 
2018
 
2017
Interest and investment expense, net
$
(52.1
)
 
$
(34.5
)
 
$
(29.7
)
Gain (loss) on foreign currency
5.1

 
(3.3
)
 
(3.3
)
Gain (loss) on strategic investments
12.5

 
(16.4
)
 
0.3

Other income
16.8

 
6.0

 
8.5

Interest and other expense, net
$
(17.7
)
 
$
(48.2
)
 
$
(24.2
)