Summary of Significant Accounting Policies (Other Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Aug. 02, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Revenues		$ 767.5	$ 726.8	$ 2,175.7	$ 2,124.5
Sale of businesses	$ 166.6
Net Income (Loss) Attributable to Parent		93.9	32.6	180.6	124.3
Net Income		$ 93.9	$ 32.6	$ 180.6	$ 124.3
Net Income Attributable to Common Shareholders per Common Share - Basic (usd per share)		$ 1.41	$ 0.49	$ 2.71	$ 1.86
Earnings Per Share, Diluted		$ 1.40	$ 0.48	$ 2.68	$ 1.84