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Earnings Per Share (Tables)
 6 Months Ended
Jul. 31, 2020
Earnings Per Share [Abstract]  
Earnings Per Share, Basic and Diluted
The following table summarizes the reconciliation of the numerators and denominators for the basic and diluted EPS computations:
 
Three Months Ended July 31,
 
Six Months Ended July 31,
(in millions)
2020
 
2019
 
2020
 
2019
Net earnings (loss) for basic and diluted EPS
$
31.9

 
$
136.3

 
$
(32.7
)
 
$
261.5

Weighted-average shares for basic EPS
121.4

 
121.1

 
121.3

 
121.3

Incremental shares based upon the assumed exercise of stock options and unvested restricted stock units
0.3

 
0.3

 
—

 
0.3

Weighted-average shares for diluted EPS
121.7

 
121.4

 
121.3

 
121.6