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Related Party Transactions and Parent Company Investment - Purchases from Parent (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Parent        
Related Party Transaction [Line Items]        
Purchases from Parent $ 13.6 $ 10.6 $ 28.0 $ 20.3