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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, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]                      
Earnings Per Share, Diluted $ (0.13) $ 0.01 $ (0.41) $ 1.06 $ (0.04) $ (0.66) $ (0.13) $ (0.17) $ 0.53 $ (1.00) $ (2.81)
Fixed Maturities Securities | Fortress Investment Group [Member]                      
Related Party Transaction [Line Items]                      
Net Investment Income                 $ 11.6 $ 11.0 $ 9.5
Related Party Transaction, Due from (to) Related Party, Noncurrent $ 176.3       $ 227.5       $ 176.3 $ 227.5  
HCP Stockholders [Member]                      
Related Party Transaction [Line Items]                      
Expenses related to Services Agreement                     $ 3.3