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Consolidated Statement of Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 191.7	$ 115.9	$ 85.5
Other comprehensive income (loss), net of income tax:
Pension actuarial amortization	4.8	8.8	7.8
Foreign currency translation	21.4	9.1	(11.9)
Total other comprehensive income (loss)	26.2	17.9	(4.1)
Total comprehensive income	$ 217.9	$ 133.8	$ 81.4

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