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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Changes in valuation and qualifying accounts |  |  |
Balance at Beginning of Year | $ 51.6 | $ 52.2 | $ 60.4
Additions Charged to Cost of Revenue | 26.6 | 18.3 | 13.1
Deductions | (21.5) | (17.5) | (20.7)
Other and Foreign Exchange Impact | (0.6) | (1.4) | (0.6)
Balance at the End of the Year | $ 56.1 | $ 51.6 | $ 52.2

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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