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Schedule II: Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions | 12 Months Ended
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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

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