Earnings per Share (Tables)

6 Months Ended

Mar. 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 March 31,		Six Months Ended March 31,
	2021	2020	2021	2020
Basic average common shares outstanding	72.4	73.4	72.3	75.8
Impact of restricted shares, restricted share units and performance share units	1.0	1.1	1.0	1.3
Impact of convertible notes	—	0.8	—	0.9
Diluted average common shares outstanding	73.4	75.3	73.3	78.0