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Earnings per Share (Tables)
 3 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted-Average Shares Outstanding The following is the reconciliation between the number of weighted-average shares used in the basic and diluted earnings per share calculation:    
Three Months Ended
December 31,
 20212020
Basic weighted-average shares outstanding54.4 54.4 
Effect of dilutive securities:
  RSE and PRSE awards0.6 0.4 
Total dilutive securities0.6 0.4 
Diluted weighted-average shares outstanding55.0 54.8