Information by Operating Segment - Reconciliation of Adjusted Earnings (Loss) to Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reconciliation [Abstract]
Net Income	$ 81.3	$ 85.1
Fair value and timing adjustments	(0.3)	(5.2)
Acquisition and restructuring activities	0.0	1.9
Income tax adjustments	0.1	0.9
Adjusted Earnings	$ 81.1	$ 82.7