Financing Agreements (Schedule of Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Sep. 30, 2016
Debt Instrument [Line Items]
Total debt	$ 1,852.6	$ 1,940.8
Unsecured Debentures [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	44.0	45.8
Senior Secured Term Loan A [Member]
Debt Instrument [Line Items]
Senior secured Term Loan A	1,369.8	1,441.0
Senior Unsecured 5.75% Notes due on September 1, 2023 [Member]
Debt Instrument [Line Items]
Fair value of unsecured notes	$ 438.8	$ 454.0