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Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Allowance for doubtful accounts |  |  |
Valuation and Qualifying Account |  |  |
Balance at beginning of year | $ 27.3 | $ 29.7 | $ 39.1
Charged (credited) to costs and expenses | 30.7 | 21.7 | 31.6
Balance at end of year | 26.9 | 27.3 | 29.7
Uncollectible accounts written off, net of recoveries |  |  |
Valuation and Qualifying Account |  |  |
Other | (31.1) | (24.1) | (39.6)
Effects of currency exchange |  |  |
Valuation and Qualifying Account |  |  |
Other |  |  | (1.4)
Deferred tax assets valuation allowance |  |  |
Valuation and Qualifying Account |  |  |
Balance at beginning of year | 114.3 | 131.3 | 59.2
Charged (credited) to costs and expenses | (7.6) | (5.8) | 5.1
Balance at end of year | 107.1 | 114.3 | 131.3
Foreign tax credit valuation allowance adjustment |  |  |
Valuation and Qualifying Account |  |  |
Other | $ 0.4 | (8.8) | 66.1
Decrease in unusable foreign operating loss carryforwards |  |  |
Valuation and Qualifying Account |  |  |
Other |  | $ (2.4) | (2.6)
Acquisitions |  |  |
Valuation and Qualifying Account |  |  |
Other |  |  | $ 3.5

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- Definition Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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