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Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]          
Customer rebate liability $ 43.1   $ 43.1   $ 71.7
Rebates recorded 69.1 $ 71.0 145.5 $ 143.1  
Contract asset $ 1.5   $ 1.5   $ 1.4