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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Oct. 31, 2019
Earnings Per Share [Abstract]  
Schedule of computation of the numerators and denominators used in the basic and diluted net loss per share amounts The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income (loss) per share amounts:

 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2019
 
2018
 
2019
 
2018
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
66.7

 
$
(23.7
)
 
$
82.7

 
$
(145.5
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net income (loss) per share—weighted average shares
219.7

 
218.9

 
219.6

 
218.7

Effect of dilutive securities (1)
2.2

 
—

 
2.5

 
—

Denominator for dilutive net income (loss) per share
221.9

 
218.9

 
222.1

 
218.7

Basic net income (loss) per share
$
0.30

 
$
(0.11
)
 
$
0.38

 
$
(0.67
)
Diluted net income (loss) per share
$
0.30

 
$
(0.11
)
 
$
0.37

 
$
(0.67
)

____________________ 
(1)
The effect of dilutive securities of 2.7 million and 3.0 million shares in the three and nine months ended October 31, 2018, respectively, has been excluded from the calculation of diluted net income (loss) per share as those shares would have been anti-dilutive due to the net loss incurred during those periods.