Earnings Per Share (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Basic average common shares outstanding	96.9	97.6	97.6	97.5
Impact of stock options	0.1	0.1	0.1	0.1
Impact of restricted shares, restricted share units and performance share units	1.8	1.6	2.0	1.5
Impact of convertible notes	1.5	1.8	1.3	0.0
Diluted average common shares outstanding	100.3	101.1	101.0	99.1