Funds Withheld Receivables Schedule of Investments underlying the funds withheld receivables (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
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