Assets and Liabilities, at Fair Value - Available for Sale Securities in OCI (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2014
Assets and Liabilities, at Fair Value [Abstract]
Equity Investments in Exchange Stock - Cost	$ 3.7	$ 3.7
Equity Investments in Exchange Stock - Fair Value	5.6	4.8
Proceeds from Sale of Productive Assets	2.1
Gain (Loss) on Disposition of Assets	1.2
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	3.4	0.7
Deferred Income Taxes, Accumulated Other Comprehensive Income - AFS	$ (2.0)	$ (0.4)