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Goodwill (Schedule of Accumulated Impairment Losses) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Line Items]
Goodwill, gross	$ 1,096.0	$ 1,239.2	$ 1,230.2
Goodwill, net	823.0	911.5	891.5
Americas
Goodwill [Line Items]
Accumulated impairment losses	(273.0)	(327.7)	(338.7)
Goodwill, net	$ 143.2	$ 151.0	$ 152.6

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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