Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 0.5	$ 0.5
Interest cost	5.3	5.2
Expected return on plan assets	(4.9)	(5.4)
Recognized net actuarial loss	0.4	0.4
Net periodic cost	$ 1.3	$ 0.7