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Goodwill (Schedule of Accumulated Impairment Losses) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Goodwill [Line Items]
Goodwill, gross	$ 1,218.0	$ 1,096.0
Goodwill, net	883.9	823.0
Americas
Goodwill [Line Items]
Goodwill, accumulated impairment losses	(334.1)	(273.0)
Goodwill, net	$ 151.9	$ 143.2

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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