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Reclassifications out of Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Dec. 31, 2020
Reclassifications out of Accumulated Other Comprehensive Loss |
Schedule of accumulated balances and reporting period activities related to reclassifications out of accumulated other comprehensive loss | The accumulated balances and reporting period activities for the three months ended December 31, 2020 and 2019 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Foreign | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Gain/(Loss) on | ​ | Other
​ |  | Related |  | Translation |  | Derivative |  | Comprehensive
​ |  | Adjustments |  | Adjustments |  | Instruments |  | Loss
Balances at September 30, 2020 | ​ | $ | (342.8) | ​ | $ | (567.3) | ​ | $ | (8.6) | ​ | $ | (918.7)
Other comprehensive (loss) income before reclassification | ​ |  | (13.7) | ​ |  | 51.7 | ​ |  | — | ​ |  | 38.0
Amounts reclassified from accumulated other comprehensive (loss) income | ​ |  | 3.0 | ​ |  | — | ​ |  | 0.9 | ​ |  | 3.9
Balances at December 31, 2020 | ​ | $ | (353.5) | ​ | $ | (515.6) | ​ | $ | (7.7) | ​ | $ | (876.8)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Foreign |  |  | ​ |  | Accumulated
​ | ​ | Pension | ​ | Currency | ​ | Gain/(Loss) on | ​ | Other
​ | ​ | Related | ​ | Translation | ​ | Derivative | ​ | Comprehensive
​ | ​ | Adjustments | ​ | Adjustments | ​ | Instruments | ​ | Loss
Balances at September 30, 2019 | ​ | $ | (302.7) | ​ | $ | (548.7) | ​ | $ | (12.8) | ​ | $ | (864.2)
Other comprehensive (loss) income before reclassification | ​ |  | (12.4) | ​ |  | 48.0 | ​ |  | 2.2 | ​ |  | 37.8
Amounts reclassified from accumulated other comprehensive (loss) income | ​ |  | 2.8 | ​ |  | — | ​ |  | 0.9 | ​ |  | 3.7
Balances at December 31, 2019 | ​ | $ | (312.3) | ​ | $ | (500.7) | ​ | $ | (9.7) | ​ | $ | (822.7)

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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