Schedule IV - Reinsurance Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Life insurance in force, gross	$ 10,873.0	$ 12,084.3	$ 12,883.1
Life insurance in force, ceded	11,140.4	12,375.8	13,235.9
Life insurance in force, assumed	267.4	291.5	352.8
Life insurance in force, net	0.0	0.0	0.0
Total premiums, gross	870.3	657.2	88.9
Total premiums, ceded	0.1	0.1	0.2
Total premiums, assumed	0.0	0.0	0.1
Total premiums, net	$ 870.2	$ 657.1	$ 88.8
Premiums, Percentage Assumed to Net	0.00%	0.00%	0.10%
Accident and health insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums, gross	$ 0.1	$ 0.1	$ 0.1
Total premiums, ceded	0.1	0.1	0.2
Total premiums, assumed	0.0	0.0	0.0
Total premiums, net	$ 0.0	$ 0.0	$ (0.1)
Premiums, Percentage Assumed to Net	0.00%	0.00%	0.00%
Annuities
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums, gross	$ 870.2	$ 657.1	$ 88.8
Total premiums, ceded	0.0	0.0	0.0
Total premiums, assumed	0.0	0.0	0.1
Total premiums, net	$ 870.2	$ 657.1	$ 88.9
Premiums, Percentage Assumed to Net	0.00%	0.00%	0.10%