Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Income Tax Disclosures [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 31.0		$ 31.1
Income tax expense (benefit)	78.2	66.5
Effective Income Tax Rate Reconciliation, Percent	35.40%	35.10%
Deferred tax assets net of DTL	$ 583.7		$ 596.1