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Net Income (Loss) Per Share (Tables)
 3 Months Ended
Apr. 30, 2020
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 April 30,
(in millions, except per share data)
2020
 
2019
Numerator:
 
 
 
Net income (loss)
$
66.5

 
$
(24.2
)
Denominator:
 
 
 
Denominator for basic net income (loss) per share—weighted average shares
219.2

 
219.6

Effect of dilutive securities (1)
2.1

 
—

Denominator for dilutive net income (loss) per share
221.3

 
219.6

Basic net income (loss) per share
$
0.30

 
$
(0.11
)
Diluted net income (loss) per share
$
0.30

 
$
(0.11
)

____________________ 
(1)
The effect of dilutive securities of 2.3 million shares in the three months ended April 30, 2019, has been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred in that period.