Quarterly Data (Unaudited) (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Quarterly Financial Data [Abstract]
Other-than-temporary impairment of an investment in a private equity partnership pre-tax loss	$ 6.3			$ 6.3	$ 0	$ 0
Increase in net loss due to impairment loss	3.7
Increase in net loss per diluted share due to impairment loss	$ 0.03
Increase in net income due to adjustment to foreign tax credit valuation allowance			5.5
Increase in earnings per share diluted due to adjustment to foreign tax credit valuation allowance			$ 0.05
Decrease in net income due to loss on extinguishment of debt		$ 2.2
Decrease in earning per diluted share due to loss on extinguishment of debt		$ 0.02