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Consolidated Statement of Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 115.9	$ 85.5	$ 76.6
Other comprehensive income (loss), net of income tax:
Pension actuarial amortization	8.8	7.8	(14.1)
Foreign currency translation	9.1	(11.9)	(25.5)
Total other comprehensive income (loss)	17.9	(4.1)	(39.6)
Total comprehensive income	$ 133.8	$ 81.4	$ 37.0

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