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Earnings Per Share (Tables)
 9 Months Ended
Oct. 31, 2016
Earnings Per Share [Abstract]  
Schedule of 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 
 October 31,
 
Nine Months Ended 
 October 31,
(in millions)
2016
 
2015
 
2016
 
2015
Net earnings for basic and diluted EPS
$
95.1

 
$
91.0

 
$
288.3

 
$
300.7

Weighted-average shares for basic EPS
124.6

 
128.6

 
125.3

 
129.0

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

 
0.5

 
0.4

 
0.5

Weighted-average shares for diluted EPS
124.9

 
129.1

 
125.7

 
129.5