Discontinued Operations, Goodwill and Intangible Assets - Schedule of Significant Components Included in Statement of Cash Flows for Discontinued Operations (Details) - Held for Sale - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Discontinued Operations, Goodwill and Intangible Assets [Line Items]
Payments for capital expenditures	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Noncash increase in noncurrent assets held for sale due to deconsolidation of a joint venture	0.0	0.0	0.0	41.6
Noncash decrease in noncontrolling interest due to deconsolidation of a joint venture	$ 0.0	$ 0.0	$ 0.0	$ (13.8)

Discontinued Operations, Goodwill and Intangible Assets - Schedule of Significant Components Included in Statement of Cash Flows for Discontinued Operations (Details) - Held for Sale - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Jun. 30, 2026

Jun. 30, 2025

Jun. 30, 2026

Jun. 30, 2025

Discontinued Operations, Goodwill and Intangible Assets [Line Items]

Payments for capital expenditures

$ 0.0

Noncash increase in noncurrent assets held for sale due to deconsolidation of a joint venture

0.0

41.6

Noncash decrease in noncontrolling interest due to deconsolidation of a joint venture

$ 0.0

$ (13.8)

- Definition

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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+ Details