Commitments and Contingencies (Pace and Pasadena - Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2012 USD ($) surfaceImpoundmentUnit	Sep. 30, 2006 USD ($)	Dec. 31, 2024 USD ($)
Environmental
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 79.1				$ 79.6
Site Contingency, Cost Review, Period					5 years
Accrual for environmental loss contingencies, maximum payout period					30 years
Pace, Florida
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies				$ 42.0	$ 54.5
Change in estimated exposure	19.0	$ 19.0
Pace, Florida | Environmental
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, maximum payout period					30 years
Pace, Florida | Discontinued operations
Loss Contingencies [Line Items]
Pretax environmental expense	$ 19.0	$ 19.0		$ 42.0
Pasadena, Texas
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies					$ 10.2
Number of closed facilities | surfaceImpoundmentUnit			2
Total anticipated exposure			$ 13.0