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Commitments and Contingencies - Legal Claims and Insurance (Details) - USD ($) $ in Millions | 6 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Rollforward of reserves for legal claims |  |
Reserves for legal claims, beginning of period | $ 858.9 | $ 729.1
Increase in reserves | 39.8 | 58.7
Payments | (49.4) | (19.5)
Reserves for legal claims, end of period | $ 849.3 | $ 768.3

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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 + Details
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