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Funds Withheld Receivables Schedule of Investments underlying the funds withheld receivables (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 12.8 |
Available For Sale Securities Carrying Value | 52.2 |
Insurance Reserves | 1,751.3 | $ 1,856.0
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value | 11.9 |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis | 231.4 |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value | 228.2 |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis | 420.8 |
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value | 429.3 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis | 487.1 |
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value | 493.3 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 1,152.1 |
Available For Sale Securities Debt Maturities Fair Value Excluding Single Maturity Date | 1,162.7 |
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 | 357.5 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 350.4 |
Structured hybrids |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | 22.2 |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | 22.0 |
Fixed Maturities Available For Sale [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,531.8 | 1,721.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 46.2 | 13.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (42.9) | (96.4)
Available-for-sale Securities, Debt Securities | 1,535.1 | 1,638.1
Available For Sale Securities Carrying Value | 1,535.1 | 1,638.1
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 | 14.1 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |
Available For Sale Securities Carrying Value |  | 14.1
Accrued Income Receivable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 17.8 | 20.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities, Debt Securities | 17.8 | 20.5
Available For Sale Securities Carrying Value | 17.8 | 20.5
Receivables, net |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 77.7 | 41.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities, Debt Securities | 77.7 | 41.1
Available For Sale Securities Carrying Value | 77.7 | 41.1
Policy Loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 8.5 | 5.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Available-for-sale Securities, Debt Securities | 8.5 | 5.0
Available For Sale Securities Carrying Value | 8.5 | 5.0
Funds Withheld Receivables [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1,645.6 | 1,800.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 47.7 | 13.2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (42.9) | (103.3)
Available-for-sale Securities, Debt Securities | 1,650.4 | 1,710.1
Available For Sale Securities Carrying Value | 1,650.4 | 1,710.1
Bankers Life Insurance Company [Member] | Fixed Maturities Available For Sale [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available For Sale Securities Carrying Value | 125.8 | 148.3
Insurance Reserves | 119.0 | 145.7
FGL [Member] | Fixed Maturities Available For Sale [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 899.3 | 1,082.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 19.8 | 7.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (38.3) | (76.1)
Available-for-sale Securities, Debt Securities | 880.8 | 1,013.6
Available For Sale Securities Carrying Value | 880.8 | 1,013.6
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 | 638.5 | 740.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 18.2 | 4.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (29.5) | (67.9)
Available-for-sale Securities, Debt Securities | 627.2 | 677.0
Available For Sale Securities Carrying Value | 627.2 | 677.0
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 | 238.8 | 274.6
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.6 | 1.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (7.9) | (6.6)
Available-for-sale Securities, Debt Securities | 231.5 | 269.3
Available For Sale Securities Carrying Value | 231.5 | 269.3
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 | 12.1 | 28.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.7 | 0.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | (0.6)
Available-for-sale Securities, Debt Securities | 12.8 | 28.0
Available For Sale Securities Carrying Value | 12.8 | 28.0
FGL [Member] | Fixed Maturities Available For Sale [Member] | United States Government and government agencies and authorities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 1.1 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.0 |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 |
Available-for-sale Securities, Debt Securities | 1.1 |
Available For Sale Securities Carrying Value | 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 | 8.8 | 38.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.3 | 1.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.9) | (1.0)
Available-for-sale Securities, Debt Securities | 8.2 | 39.3
Available For Sale Securities Carrying Value | 8.2 | 39.3
FGL [Member] | Derivative Financial Instruments, Assets [Member] | Call options |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 9.8 | 12.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.5 | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | (6.9)
Available-for-sale Securities, Debt Securities | 11.3 | 5.4
Available For Sale Securities Carrying Value | 11.3 | 5.4
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 | 632.5 | 638.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 26.4 | 5.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (4.6) | (20.3)
Available-for-sale Securities, Debt Securities | 654.3 | 624.5
Available For Sale Securities Carrying Value | 654.3 | 624.5
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 | 390.0 | 420.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 18.8 | 3.7
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (2.7) | (18.5)
Available-for-sale Securities, Debt Securities | 406.1 | 406.0
Available For Sale Securities Carrying Value | 406.1 | 406.0
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 | 118.7 | 125.4
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.9 | 1.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1.7) | (1.0)
Available-for-sale Securities, Debt Securities | 118.9 | 125.7
Available For Sale Securities Carrying Value | 118.9 | 125.7
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 | 49.5 | 72.9
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 4.1 | 0.8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | (0.7)
Available-for-sale Securities, Debt Securities | 53.6 | 73.0
Available For Sale Securities Carrying Value | 53.6 | 73.0
Third party cedants [Member] | Fixed Maturities Available For Sale [Member] | United States Government and government agencies and authorities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 67.7 | 8.3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 1.3 | 0.1
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (0.2) | 0.0
Available-for-sale Securities, Debt Securities | 68.8 | 8.4
Available For Sale Securities Carrying Value | 68.8 | 8.4
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 | 6.6 | 11.5
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0.3 | 0.0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | (0.1)
Available-for-sale Securities, Debt Securities | 6.9 | 11.4
Available For Sale Securities Carrying Value | $ 6.9 | $ 11.4

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