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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Earnings Per Share [Abstract]    
Net earnings for basic and diluted EPS $ 125.2 $ 142.3
Weighted-average shares for basic EPS (shares) 121.4 124.4
Incremental shares based upon the assumed exercise of stock options and unvested restricted stock units (shares) 0.5 0.6
Weighted-average shares for diluted EPS (shares) 121.9 125.0
Antidilutive securities excluded from computation of earnings per share (shares) 1.7 0.9