Note 14 - Information by Operating Segment - Net Economic Earnings to Net Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Net Income	$ 250.9	$ 217.5	$ 220.8
Fair value and timing adjustments	(12.4)	11.4	(11.4)
Acquisition and restructuring activities	7.6	2.5	0.0
Income tax adjustments	1.3	(3.3)	6.9
Adjusted Earnings	$ 247.4	$ 228.1	$ 216.3