Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Retirement Benefits (Textual) [Abstract]
Voluntary Contribution To Qualified Pension Plan Trust	$ 300
Pension Benefits [Member]
Components of net periodic benefit cost
Service cost	23.1	17.9
Interest cost	40.2	41.9
Expected return on plan assets	(56.8)	(57.0)
Amortization:
Prior service credit	(0.6)	(0.6)
Net actuarial loss	36.3	23.7
Net periodic benefit cost	42.2	25.9
Other Postretirement Benefits [Member]
Components of net periodic benefit cost
Service cost	0.6	0.5
Interest cost	1.6	1.8
Amortization:
Prior service credit	(2.7)	(2.6)
Net actuarial loss	1.1	0.6
Net periodic benefit cost	$ 0.6	$ 0.3