Financing Agreements (Schedule of Fair Value) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Total	$ 1,714.1	$ 1,766.1
Unsecured debentures [Member]
Debt Instrument [Line Items]
Unsecured, fair value	48.1	42.9
Senior secured Term Loan A [Member]
Debt Instrument [Line Items]
Secured, fair value	918.2	991.9
Senior unsecured 5.75% Notes due on September 1, 2023 [Member]
Debt Instrument [Line Items]
Unsecured, fair value	$ 0.0	437.3
Stated interest rate (percent)	5.75%
Senior unsecured 5.00% Notes due on February 14, 2025 [Member]
Debt Instrument [Line Items]
Unsecured, fair value	$ 312.4	294.0
Stated interest rate (percent)	5.00%
Senior Unsecured 4.375% Notes due September 2027 [Member]
Debt Instrument [Line Items]
Unsecured, fair value	$ 435.4	$ 0.0
Stated interest rate (percent)	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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Fair value portion of notes payable.

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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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