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Commitments and Contingencies - Legal Claims and Insurance (Details) - USD ($) $ in Millions | 9 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Rollforward of reserves for legal claims |  |
Reserves for legal claims, beginning of period | $ 577.5 | $ 473.8
Increase in reserves | 119.1 | 88.8
Payments | (22.2) | (19.5)
Reserves for legal claims, end of period | $ 674.4 | $ 543.1

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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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