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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 | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 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), Operating | Interest Income (Expense), Operating | Interest Income (Expense), Operating | Interest Income (Expense), Operating
Income (Loss) recognized in Other comprehensive income (loss) | $ 3.6 | $ 21.9 | $ (0.0) | $ 23.4
Net income reclassified from Accumulated other comprehensive income into Interest expense | $ 2.8 | $ 2.6 | $ 8.4 | $ 6.9
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) | $ (0.2) | $ 0.0 | $ (0.1) | $ 0.0
Net income reclassified from Accumulated other comprehensive income into Interest expense | $ 0.1 | $ 0.0 | $ 0.1 | $ 0.0

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- Definition Indicates line item in statement of income or comprehensive income that includes gain (loss) from effective portion of derivative instrument reclassified from accumulated other comprehensive income (AOCI) into income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4D + Details
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