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Schedule II: Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Changes in valuation and qualifying accounts      
Balance at Beginning of Year $ 56.5 $ 54.2 $ 53.7
Additions Charged to Cost of Revenue 37.6 23.9 18.1
Deductions (16.4) (21.0) (16.3)
Other and Foreign Exchange Impact 0.2 (0.6) (1.3)
Balance at the End of the Year $ 77.9 $ 56.5 $ 54.2