Defined Benefit Pension and Other Postretirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Contribution made to Pension Plan			$ 5.6	$ 7.0
Expected contribution to pensions plans during remainder of fiscal year			5.6
Net cost to sponsor unfunded and non-qualified supplemental executive retirement plans	$ 0.6	$ 0.9	$ 1.3	$ 1.7