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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Earnings Per Share [Abstract]    
Net earnings $ 142.3 $ 92.9
Basic 124.4 124.6
Incremental shares based upon the assumed exercise of stock options and unvested restricted stock units 0.6 0.7
Weighted-average shares for diluted EPS 125.0 125.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.9 0.9