Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Related Party Transactions Schedule of Transactions with Related Parties (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Related Party Transaction [Line Items]
Earnings Per Share, Diluted	$ (0.73)	$ (0.38)	$ (1.16)	$ (0.56)	$ (0.03)	$ 0.28	$ (0.63)	$ (0.28)	$ (2.81)	$ (0.51)	$ (0.67)
Accrued investment income	$ 192.0				$ 184.9				$ 192.0	$ 184.9
Fortress Investment Group [Member]
Related Party Transaction [Line Items]
Accrued investment income	1.6				1.9				1.6	1.9
Related Party Transaction, Due from (to) Related Party, Noncurrent	182.6				196.8				182.6	196.8
Fixed Maturities Securities \| Fortress Investment Group [Member]
Related Party Transaction [Line Items]
Net Investment Income									8.1	1.6
Available-for-sale Securities, Noncurrent	$ 181.0				$ 194.9				181.0	194.9
Fixed Maturities Securities \| Leucadia [Member]
Related Party Transaction [Line Items]
Net Investment Income									0.0	1.1
Fixed Maturities Securities \| Jefferies [Member]
Related Party Transaction [Line Items]
Net Investment Income									$ 0.0	$ 1.2