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Earnings per Share (Tables)
3 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Basic Average Common Shares Outstanding
A reconciliation of basic average common shares outstanding to diluted average common shares outstanding is as follows (in millions):
Three Months Ended December 31,
20212020
Basic average common shares outstanding70.2 72.2 
Impact of restricted shares, restricted share units and performance share units1.0 1.0 
Diluted average common shares outstanding71.2 73.2