Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 3.6		$ 3.2
Income (Loss) from Continuing Operations before Income Taxes, Domestic			$ (9.7)	$ 16.5	$ (18.4)
Deferred Tax Liabilities, Gross	4.5
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	1.3
Income Tax Expense (Benefit)	$ 2.1	$ 3.3
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	25.00%	27.00%