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Earnings Per Share (Tables)
 9 Months Ended
Oct. 31, 2019
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 
 October 31,		Nine Months Ended 
 October 31,
(in millions)2019201820192018
Net earnings for basic and diluted EPS$78.4  $94.9  $339.9  $381.9  
Weighted-average shares for basic EPS120.3  122.3  121.0  123.3  
Incremental shares based upon the assumed exercise of stock options and unvested restricted stock units
0.3  0.8  0.3  0.7  
Weighted-average shares for diluted EPS120.6  123.1  121.3  124.0