Intangible Assets, Goodwill and Other (Changes in Carrying Amount of Goodwill by Reportable Operating Segment) (Details) $ in Millions	6 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Line Items]
Goodwill, beginning balance	$ 3,218.3
Other	11.0	[1]
Goodwill, ending balance	3,229.3
North America [Member]
Goodwill [Line Items]
Goodwill, beginning balance	491.5
Other	(0.1)	[1]
Goodwill, ending balance	491.4
International [Member]
Goodwill [Line Items]
Goodwill, beginning balance	2,691.1
Other	11.1	[1]
Goodwill, ending balance	2,702.2
Channel Development [Member]
Goodwill [Line Items]
Goodwill, beginning balance	34.7
Other	0.0	[1]
Goodwill, ending balance	34.7
Corporate and Other [Member]
Goodwill [Line Items]
Goodwill, beginning balance	1.0
Other	0.0	[1]
Goodwill, ending balance	$ 1.0

[1] “Other” consists of changes in the goodwill balance resulting from foreign currency translation.