Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Acquisitions - Additional Information (Details) $ in Millions		3 Months Ended	6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2026 USD ($)
Piedmont Tennessee Transaction [Member]
Business Combination [Line Items]
Consideration transferred in cash	$ 2,500.0		$ 2,500.0
Senior Unsecured Term Loan Facility [Member] \| Piedmont Tennessee Transaction [Member]
Business Combination [Line Items]
Aggregate principal amount	800.0	$ 800.0	800.0
Junior Subordinated Notes [Member] \| Piedmont Tennessee Transaction [Member]
Business Combination [Line Items]
Aggregate principal amount	900.0	900.0	900.0
Senior Unsecured Notes [Member] \| Private Placement [Member] \| Piedmont Tennessee Transaction [Member]
Business Combination [Line Items]
Aggregate principal amount	$ 825.0	825.0	825.0
Operation and Maintenance Expense
Business Combination [Line Items]
Transaction costs incurred in association with acquisition		$ 23.1	$ 25.0