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Schedule IV - Reinsurance Schedule IV - Reinsurance (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Gross Amount, life insurance in force   $ 2,933.1 $ 2,785.6 $ 2,596.7
Ceded to other companies, life insurance in force   (2,010.1) (2,014.3) (1,965.4)
Assumed from other companies, life insurance in force   0.4 16.4 17.3
Net Amount, life insurance in force   $ 923.4 $ 787.7 $ 648.6
Percentage of amount assumed to net, life insurance in force   0.00% 2.10% 2.70%
Gross Amount, premiums and other considerations   $ 419.8 $ 409.3 $ 414.7
Ceded to other companies, premiums and other considerations   (267.9) (317.5) (328.2)
Assumed from other companies, premiums and other considerations   (0.5) 35.9 32.8
Total Premiums and Other Considerations, net   151.4 127.7 119.3
Net Amount, premiums and other considerations   $ 59.8 $ 56.6 $ 58.8
Percentage of amount assumed to net, premiums and other considerations   (0.30%) 28.10% 27.50%
Life Insurance Product Line [Member]        
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Gross Amount, premiums and other considerations   $ 260.1 $ 266.8 $ 279.2
Ceded to other companies, premiums and other considerations   (199.8) (246.1) (253.2)
Assumed from other companies, premiums and other considerations   $ (0.5) 35.9 32.8
Net Amount, premiums and other considerations $ 59.8   $ 56.6 $ 58.8
Percentage of amount assumed to net, premiums and other considerations   (0.80%) 63.40% 55.80%
Annuity product line        
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Gross Amount, premiums and other considerations   $ 159.7 $ 142.5 $ 135.5
Ceded to other companies, premiums and other considerations   (68.1) (71.4) (75.0)
Assumed from other companies, premiums and other considerations   0.0 0.0 0.0
Net Amount, premiums and other considerations   $ 91.6 $ 71.1 $ 60.5
Percentage of amount assumed to net, premiums and other considerations   0.00% 0.00% 0.00%