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Commitments and Contingencies - Legal Claims and Insurance (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Rollforward of reserves for legal claims
Reserves for legal claims, beginning of period	$ 473.8	$ 434.7
Increase in reserves	88.8	57.1
Payments	(19.5)	(30.5)
Reserves for legal claims, end of period	$ 543.1	$ 461.3

X

- Definition

Amount of loss contingency liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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X

- Definition

Amount of increase (decrease) in loss contingency liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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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.

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