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Fair Value Measurements and Derivative Instruments - Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges (Details) - Cash Flow Hedges - Designated - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Interest Rate Contracts |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Interest Income (Expense), Net | Interest Income (Expense), Net | Interest Income (Expense), Net | Interest Income (Expense), Net
Income (Loss) recognized in Other comprehensive income (loss) | $ 10.9 | $ 1.5 | $ (3.6) | $ 1.5
Net income reclassified from Accumulated other comprehensive income into Interest expense | $ 2.8 | $ 1.3 | $ 5.6 | $ 4.3
Fuel Swap Contracts |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] | Cost of Goods and Services Sold | Cost of Goods and Services Sold | Cost of Goods and Services Sold | Cost of Goods and Services Sold
Income (Loss) recognized in Other comprehensive income (loss) | $ 0.1 | $ 0.0 | $ 0.1 | $ 0.0
Net income reclassified from Accumulated other comprehensive income into Interest expense | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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