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Related Party Transactions Schedule of Related Party Transactions - Income Statement (Details) - Fortress Investment Group [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Related Party Transaction [Line Items]          
Related Party Transaction, Due from (to) Related Party, Noncurrent $ 183.1   $ 183.1   $ 182.6
Fixed Maturities [Member]          
Related Party Transaction [Line Items]          
Net Investment Income $ 2.0 $ 1.9 $ 4.0 $ 3.9