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Net Income Per Share (Tables)
 6 Months Ended
Jul. 31, 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 per share amounts:

 
Three Months Ended July 31,
 
Six Months Ended July 31,
(in millions, except per share data)
2020
 
2019
 
2020
 
2019
Numerator:
 
 
 
 
 
 
 
Net income
$
98.2

 
$
40.2

 
$
164.7

 
$
16.0

Denominator:
 
 
 
 
 
 
 
Denominator for basic net income per share—weighted average shares
219.2

 
219.6

 
219.2

 
219.6

Effect of dilutive securities
3.0

 
2.8

 
2.8

 
2.7

Denominator for dilutive net income per share
222.2

 
222.4

 
222.0

 
222.3

Basic net income per share
$
0.45

 
$
0.18

 
$
0.75

 
$
0.07

Diluted net income per share
$
0.44

 
$
0.18

 
$
0.74

 
$
0.07