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Funds Withheld Receivables (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Document Fiscal Year Focus |  |  | 2017 |  |
Document Period End Date |  |  | Mar. 31, 2017 |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 18.6 |  | $ 18.6 |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | 18.6 |  | 18.6 |  |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | 201.6 |  | 201.6 |  |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value | 198.0 |  | 198.0 |  |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis | 498.0 |  | 498.0 |  |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value | 496.2 |  | 496.2 |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 496.3 |  | 496.3 |  |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 481.6 |  | 481.6 |  |
Available For Sale Securities Debt Maturities Amortized Cost Excluding Single Maturity Date | 1,214.5 |  | 1,214.5 |  |
Available For Sale Securities Debt Maturities Fair Value Excluding Single Maturity Date | 1,194.4 |  | 1,194.4 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 188.8 |  | 188.8 |  | $ 216.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5.8 |  | 5.8 |  | 15.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 266.3 |  | 266.3 |  | 190.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 25.7 |  | 25.7 |  | 22.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 455.1 |  | 455.1 |  | 406.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 31.5 |  | 31.5 |  | $ 38.3
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities | 0.0 | $ 4.5 | 1.0 | $ 5.9 |
Gross Investment Income | 12.9 | 16.2 | 23.6 | 36.5 |
Gain (Loss) on Sale of Equity Investments | 0.8 | 0.0 | 0.7 | 1.8 |
Gain (Loss) on Sale of Derivatives | 5.8 | (1.4) | 8.9 | 0.5 |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | 10.9 | 16.9 | (1.3) | (9.6) |
Gain (Loss) on Sale of Other Investments | 12.1 | 29.6 | (10.3) | 17.1 |
Net investment gains (losses) | $ 32.0 | 39.7 | $ (1.8) | 7.7 |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | 135 |  | 135 |  | 146
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | 112 |  | 112 |  | 76
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 247 |  | 247 |  | 222
Fixed Maturity Available For Sale Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Investment Income | $ 11.9 | 14.1 | $ 22.1 | 29.6 |
Gain Loss On Sale Of Available For Sale Securities | 2.4 | (5.4) | 0.2 | (2.1) |
Corporate Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 152.4 |  | 152.4 |  | $ 137.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5.3 |  | 5.3 |  | 12.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 159.6 |  | 159.6 |  | 91.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 20.5 |  | 20.5 |  | 16.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 312.0 |  | 312.0 |  | 229.5
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 25.8 |  | 25.8 |  | 29.5
Mortgage Backed Securities, Other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 333.2 |  | 333.2 |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 330.7 |  | 330.7 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 29.5 |  | 29.5 |  | 73.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 |  | 0.1 |  | 2.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 100.6 |  | 100.6 |  | 99.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4.8 |  | 4.8 |  | 5.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 130.1 |  | 130.1 |  | 172.3
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 4.9 |  | 4.9 |  | 7.9
Municipal Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 5.9 |  | 5.9 |  | 1.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.3 |  | 0.3 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0.9 |  | 0.9 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6.8 |  | 6.8 |  | 1.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.3 |  | 0.3 |  | 0.0
US Treasury and Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1.0 |  | 1.0 |  | 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 |  | 0.1 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 1.0 |  | 1.0 |  | 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.1 |  | 0.1 |  | 0.0
Preferred Stock [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0.0 |  | 0.0 |  | 3.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 |  | 0.0 |  | 0.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 5.2 |  | 5.2 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.4 |  | 0.4 |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5.2 |  | 5.2 |  | 3.7
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 0.4 |  | 0.4 |  | 0.9
Structured Hybrids [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 19.1 |  | 19.1 |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 18.3 |  | 18.3 |  |
Equity Securities Available For Sale [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Investment Income | 0.2 | 0.6 | 0.4 | 1.2 |
Asset based loan receivables [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Investment Income | 0.7 | 1.2 | 1.0 | 3.2 |
Other Investments [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Investment Income | 0.1 | $ 0.3 | 0.1 | $ 2.5 |
Funds Withheld Receivables [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,653.2 |  | 1,653.2 |  | 1,645.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 24.7 |  | 24.7 |  | 47.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (43.7) |  | (43.7) |  | (42.9)
Available-for-sale Securities, Debt Securities | 1,634.2 |  | 1,634.2 |  | 1,650.4
Total investments, Carrying Value | 1,634.2 |  | 1,634.2 |  | 1,650.4
Policy Loans [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 8.3 |  | 8.3 |  | 8.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Debt Securities | 8.3 |  | 8.3 |  | 8.5
Total investments, Carrying Value | 8.3 |  | 8.3 |  | 8.5
Receivables, net [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 52.2 |  | 52.2 |  | 77.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Debt Securities | 52.2 |  | 52.2 |  | 77.7
Total investments, Carrying Value | 52.2 |  | 52.2 |  | 77.7
Accrued Income Receivable [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 17.0 |  | 17.0 |  | 17.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Debt Securities | 17.0 |  | 17.0 |  | 17.8
Total investments, Carrying Value | 17.0 |  | 17.0 |  | 17.8
Fixed Maturities Available For Sale [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,566.8 |  | 1,566.8 |  | 1,531.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 20.3 |  | 20.3 |  | 46.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (43.7) |  | (43.7) |  | (42.9)
Available-for-sale Securities, Debt Securities | 1,543.4 |  | 1,543.4 |  | 1,535.1
Total investments, Carrying Value | 1,543.4 |  | 1,543.4 |  | 1,535.1
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 686.3 |  | 686.3 |  | 632.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 9.0 |  | 9.0 |  | 26.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (12.2) |  | (12.2) |  | (4.6)
Available-for-sale Securities, Debt Securities | 683.1 |  | 683.1 |  | 654.3
Total investments, Carrying Value | 683.1 |  | 683.1 |  | 654.3
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 404.4 |  | 404.4 |  | 390.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 5.9 |  | 5.9 |  | 18.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (7.2) |  | (7.2) |  | (2.7)
Available-for-sale Securities, Debt Securities | 403.1 |  | 403.1 |  | 406.1
Total investments, Carrying Value | 403.1 |  | 403.1 |  | 406.1
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 135.4 |  | 135.4 |  | 118.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 2.4 |  | 2.4 |  | 1.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1.1) |  | (1.1) |  | (1.7)
Available-for-sale Securities, Debt Securities | 136.7 |  | 136.7 |  | 118.9
Total investments, Carrying Value | 136.7 |  | 136.7 |  | 118.9
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] | Municipal Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 56.2 |  | 56.2 |  | 49.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.7 |  | 0.7 |  | 4.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.4) |  | (0.4) |  | 0.0
Available-for-sale Securities, Debt Securities | 56.5 |  | 56.5 |  | 53.6
Total investments, Carrying Value | 56.5 |  | 56.5 |  | 53.6
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] | US Treasury and Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 83.0 |  | 83.0 |  | 67.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  | 1.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (3.5) |  | (3.5) |  | (0.2)
Available-for-sale Securities, Debt Securities | 79.5 |  | 79.5 |  | 68.8
Total investments, Carrying Value | 79.5 |  | 79.5 |  | 68.8
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] | Agency Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 7.3 |  | 7.3 |  | 6.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  | 0.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Debt Securities | 7.3 |  | 7.3 |  | 6.9
Total investments, Carrying Value | 7.3 |  | 7.3 |  | 6.9
FGL [Member] | Derivative Financial Instruments, Assets [Member] | Call options [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 8.9 |  | 8.9 |  | 9.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 4.4 |  | 4.4 |  | 1.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Securities, Debt Securities | 13.3 |  | 13.3 |  | 11.3
Total investments, Carrying Value | 13.3 |  | 13.3 |  | 11.3
FGL [Member] | Fixed Maturities Available For Sale [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 880.5 |  | 880.5 |  | 899.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 11.3 |  | 11.3 |  | 19.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (31.5) |  | (31.5) |  | (38.3)
Available-for-sale Securities, Debt Securities | 860.3 |  | 860.3 |  | 880.8
Total investments, Carrying Value | 860.3 |  | 860.3 |  | 880.8
FGL [Member] | Fixed Maturities Available For Sale [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 661.1 |  | 661.1 |  | 638.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 10.0 |  | 10.0 |  | 18.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (25.8) |  | (25.8) |  | (29.5)
Available-for-sale Securities, Debt Securities | 645.3 |  | 645.3 |  | 627.2
Total investments, Carrying Value | 645.3 |  | 645.3 |  | 627.2
FGL [Member] | Fixed Maturities Available For Sale [Member] | Mortgage Backed Securities, Other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 197.8 |  | 197.8 |  | 238.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.1 |  | 1.1 |  | 0.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (4.9) |  | (4.9) |  | (7.9)
Available-for-sale Securities, Debt Securities | 194.0 |  | 194.0 |  | 231.5
Total investments, Carrying Value | 194.0 |  | 194.0 |  | 231.5
FGL [Member] | Fixed Maturities Available For Sale [Member] | Municipal Debt Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 12.0 |  | 12.0 |  | 12.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.1 |  | 0.1 |  | 0.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.3) |  | (0.3) |  | 0.0
Available-for-sale Securities, Debt Securities | 11.8 |  | 11.8 |  | 12.8
Total investments, Carrying Value | 11.8 |  | 11.8 |  | 12.8
FGL [Member] | Fixed Maturities Available For Sale [Member] | US Treasury and Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1.1 |  | 1.1 |  | 1.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |  | 0.0 |  | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.1) |  | (0.1) |  | 0.0
Available-for-sale Securities, Debt Securities | 1.0 |  | 1.0 |  | 1.1
Total investments, Carrying Value | 1.0 |  | 1.0 |  | 1.1
FGL [Member] | Fixed Maturities Available For Sale [Member] | Preferred Stock [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 8.5 |  | 8.5 |  | 8.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.1 |  | 0.1 |  | 0.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.4) |  | (0.4) |  | (0.9)
Available-for-sale Securities, Debt Securities | 8.2 |  | 8.2 |  | 8.2
Total investments, Carrying Value | $ 8.2 |  | $ 8.2 |  | $ 8.2

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