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Revenue Recognition - Schedule of Contract Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020
Contract With Customer Liability [Abstract]
Customer advances	$ 706.0	$ 491.4
Other current liabilities	66.5	59.5
Other long-term liabilities	106.8	53.7
Total contract liabilities	$ 879.3	$ 604.6

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- Definition

Contract with customer other current liability.

+ References

No definition available.

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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