Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value portion of notes payable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
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Financing Agreements (Schedule of Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020	Oct. 07, 2019
Debt Instrument [Line Items]
Total	$ 490.5	$ 799.3
Unsecured debenture interest rate			4.375%
Unsecured Debentures [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	47.2	48.0
Senior Unsecured 5.00% Notes due on February 14, 2025 [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	$ 0.0	310.1
Unsecured debenture interest rate	5.00%
Senior Unsecured 4.375% Notes due September 2027 [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	$ 443.3	$ 441.2
Unsecured debenture interest rate	4.375%