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Fair Value Measurements - Impairment of Assets Measured at Fair Value on a Nonrecurring Basis Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Operating Lease, Impairment Loss | $ 23.5 | $ 6.7 | $ 3.5 |
Fair Value, Nonrecurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | $ 6.2
Operating Lease, Impairment Loss |  |  | $ 3.5 |
Fair Value, Nonrecurring | Fair Value, Inputs, Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Operating Lease, Impairment Loss | 23.5 | 6.7 |  |
Tangible Asset Impairment Charges | $ 10.3 | $ 0.2 |  |

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