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Share-based Payments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation expense		$ 102.3		$ 68.7
Recognition period of unrecognized compensation expense (in years)	3 years	3 years
PEP Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period (in years)		3 years
Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Compensation expense related to share-based payments		$ 30.8	$ 30.6

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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