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Goodwill (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Goodwill [Abstract]
Goodwill, gross	$ 180.7	$ 180.7
Accumulated impairment losses	(114.8)	(114.8)
Goodwill	$ 65.9	$ 65.9

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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