Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 2.0	$ 0.3	$ 2.6	$ 1.5	$ (3.3)	$ 2.0	$ 0	$ 3.9	$ 6.4	$ 2.6	$ 5.5
Discontinued Operation, Tax Effect of Discontinued Operation									(0.2)	0.7	(2.4)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax									0.1	(1.6)	2.2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax									(0.5)	1.8	(1.0)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation									0.1	0	(0.2)
Other Comprehensive Income (Loss), Tax									5.9	3.5	4.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense									0	(0.2)	0.3
Operating Loss Carryforwards	19.0				11.8				19.0	11.8
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	14.4				7.3				14.4	7.3
Deferred Tax Assets, Net of Valuation Allowance, Operating Loss Carryforwards, State and Local	4.7								4.7
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	0.5				0				0.5	0
Deferred Tax Assets, Valuation Allowance	(2.8)				(2.3)				(2.8)	(2.3)
Valuation Allowance, Deferred Tax Asset, Change in Amount									0.5
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				1.3	1.3
Undistributed Earnings of Foreign Subsidiaries	$ 175.1				$ 123.1				$ 175.1	$ 123.1