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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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- 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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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Amount of loss from impairment of right-of-use asset from operating lease.

+ References

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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