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Allowance for Doubtful Accounts - Allowance for Bad Debts (Details)
$ in Millions
3 Months Ended
Dec. 31, 2023
USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]  
Balance as of September 30, 2023 $ 59.9
Recovery of bad debts (0.5)
Other 0.5
Balance as of December 31, 2023 $ 59.9