Schedule IV. Reinsurance Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums,gross	$ 36.2	$ 34.0	$ 67.6
Total premiums, ceded	0.2	0.2	0.3
Total premiums, assumed	0	0.1	0
Net premiums	36.0	33.9	67.3
Life insurance in force
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Life insurance in force, gross	14,684.5	15,765.3	16,817.0
Life insurance in force, ceded	15,109.5	16,247.8	17,364.7
Life insurance in force, assumed	425.0	482.5	547.7
Life insurance in force, net	0	0	0
Accident and health insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums,gross	0.2	0.2	0.3
Total premiums, ceded	0.2	0.2	0.3
Total premiums, assumed	0	0	0
Net premiums	0	0	0
Annuities
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums,gross	36.0	33.8	67.3
Total premiums, ceded	0	0	0
Total premiums, assumed	0	0.1	0
Net premiums	$ 36.0	$ 33.9	$ 67.3