Financing Agreements (Schedule of Fair Value) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Total	$ 792.9	$ 795.9
Unsecured Debentures [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	$ 47.0	48.1
Senior Unsecured 5.75% Notes due on September 1, 2023 [Member]
Debt Instrument [Line Items]
Unsecured debenture interest rate	5.75%
Senior Unsecured 5.00% Notes due on February 14, 2025 [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	$ 310.5	$ 312.4
Unsecured debenture interest rate		5.00%
Senior Unsecured 4.375% Notes due September 2027 [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	$ 435.4	$ 435.4
Unsecured debenture interest rate		4.375%

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=6877327&loc=d3e13212-122682

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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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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