Employee Retirement Plans (Weighted-average assumptions) (Details)	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2010	Sep. 30, 2011		Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Pension Plans [Member]
Weighted-average assumptions:
Discount rate - benefit obligations		5.30%	[1]	5.20%	4.20%	5.30%	[1]
Discount rate - benefit cost	5.00%	5.50%		4.20%	5.30%	5.00%	[1]
Expected return on plan assets				7.75%	7.75%	8.00%	[1]
Rate of increase in salary levels				3.25%	3.25%	3.50%	[1]
Other Postretirement Benefits [Member]
Weighted-average assumptions:
Discount rate - benefit obligations		5.30%				5.30%
Discount rate - benefit cost					5.30%	5.00%
Expected return on plan assets				5.00%	5.20%	5.50%
Rate of increase in salary levels				3.25%	3.25%	3.50%
Minimum [Member] | Other Postretirement Benefits [Member]
Weighted-average assumptions:
Discount rate - benefit obligations				5.10%	4.10%
Discount rate - benefit cost				4.10%
Maximum [Member] | Other Postretirement Benefits [Member]
Weighted-average assumptions:
Discount rate - benefit obligations				5.40%	4.30%
Discount rate - benefit cost				4.30%

[1] were rates of 5.0% through December 31, 2010 (the date of the Pension Plans Merger) and 5.5%