Pension And Other Postretirement Benefits (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits [Member]
Service cost	$ 1.4	$ 1.7	$ 4.1	$ 5.0
Interest cost	3.1	3.2	9.2	9.8
Expected return on plan assets	(4.7)	(4.0)	(14.0)	(12.0)
Amortization of prior service cost	0.1	0.1	0.3	0.3
Amortization of net loss	1.2	1.0	3.6	2.9
Net periodic benefit cost	1.1	2.0	3.2	6.0
Other Postretirement Benefits [Member]
Service cost	0.6	0.7	1.8	2.2
Interest cost	1.2	1.3	3.8	3.9
Amortization of prior service cost	(0.2)	(0.3)	(0.8)	(1.0)
Amortization of net loss			0.1
Net periodic benefit cost	$ 1.6	$ 1.7	$ 4.9	$ 5.1