Income Taxes (Components of Income Tax Expense (Benefit) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Current and Deferred Income Tax Expense (Benefit) [Line Items]
Deferred Income Tax Expense (Benefit)			$ 4.0	$ 1.3
Income Tax Expense (Benefit)	$ 3.1	$ 2.5	$ 3.4	$ 0.9