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Related Party Transactions Schedule of Related Party Transactions - Income Statement (Details) - Fixed Maturities [Member] - Fortress Investment Group [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Related Party Transaction [Line Items]          
Net Investment Income $ 3.1 $ 2.3 $ 6.1 $ 4.5  
Related Party Transaction, Due from (to) Related Party, Noncurrent $ 275.2   $ 275.2   $ 203.2