Retirement and Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Retirement and Postretirement Plans [Abstract]
Service cost	$ 1.5	$ 1.4
Interest cost	3.3	3.3
Expected return on plan assets	(4.0)	(4.2)
Amortization of unrecognized prior service cost, net	0.1	0.2
Amortization of net loss	2.0	1.5
Net pension expense	2.9	2.2
Defined contribution savings plans expense	$ 3.4	$ 3.4