Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 2.8		$ 2.8		$ 0
Income (Loss) from Continuing Operations before Income Taxes, Domestic					17.3	24.5	21.9
Deferred Tax Liabilities, Gross	3.9		3.9
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	1.3		1.3
Income Tax Expense (Benefit)	$ 5.1	$ 2.6	$ 9.3	$ 4.1
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	28.00%	25.00%	29.00%	29.00%