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Commitments and Contingencies - Legal Claims and Insurance (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Rollforward of reserves for legal claims |  |
Reserves for legal claims, beginning of period | $ 729.1 | $ 577.5
Increase in reserves | 26.9 | 14.5
Payments | (7.5) | (6.8)
Reserves for legal claims, end of period | $ 748.5 | $ 585.2

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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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