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Net Income Per Share (Tables)
 3 Months Ended
Apr. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Computation of the Numerators and Denominators Used in the Basic and Diluted Net Loss Per Share Amounts The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:
 Three Months Ended April 30,
20212020
Numerator:
Net income $155.6 $66.5 
Denominator:
Denominator for basic net income per share—weighted average shares219.6 219.2 
Effect of dilutive securities2.4 2.1 
Denominator for dilutive net income per share222.0 221.3 
Basic net income per share$0.71 $0.30 
Diluted net income per share$0.70 $0.30