Long-term and Short-term Debt (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Long term and Short term (Textuals) [Abstract]
Maximum debt to total capital ratio required by debt covenants	60.00%
Commercial Paper	$ 179.0	$ 157.0
Short-term Debt, Weighted Average Interest Rate	0.17%	0.27%
Short Term Debt Weighted Average Maturity Period	5 days	6 days
Interest payments	59.7	59.0	60.1
Former Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term		4 years
Line of Credit Facility, Expiration Date		Mar. 15, 2015
Unsecured revolving credit facility		750.0
New Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Term	5 years
Line of Credit Facility, Initiation Date	May 22, 2013
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	$ 121.6