Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net Income	$ 95.4	$ 78.3	$ 70.4
Other Comprehensive Income, net of tax
Benefit plan net gain (loss) and prior service credit, net of amortization	0.2	(1.7)	(1.6)
Cumulative translation adjustment	5.8	18.0	17.4
Total Other Comprehensive Income, net of tax	6.0	16.3	15.8
Comprehensive Income	$ 101.4	$ 94.6	$ 86.2