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Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended
Dec. 31, 2021
USD ($)
Fair Value, Nonrecurring [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Impairment of Intangible Assets (Excluding Goodwill) $ 6.2