Retirement and Postretirement Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined contribution savings plans expense	$ 6.1	$ 4.2
Master Defined Benefit Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.3	1.4
Interest cost	2.7	3.7
Expected return on plan assets	(3.3)	(4.3)
Amortization of unrecognized prior service cost, net	0.1	0.1
Amortization of net loss	1.1	1.4
Net pension expense	$ 1.9	$ 2.3