Long-term and Short-term Debt (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Long term and Short term (Textuals) [Abstract]
Maximum debt to total capital ratio required by debt covenants	0.60
Commercial paper borrowings	$ 325.0	$ 179.0
Weighted average interest rate of commercial paper outstanding	0.17%	0.17%
Interest payments	58.1	59.7	59.0
Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Line of Credit Facility, Expiration Date	May 22, 2018
Unsecured revolving credit facility	750.0
Option to increase borrowing capacity of credit facility	250.0
Non US Facilities [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility	$ 126.6