Schedule IV - Reinsurance Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Life insurance in force, gross	$ 13,738.1	$ 14,684.5	$ 15,765.3
Life insurance in force, ceded	14,120.4	15,109.5	16,247.8
Life insurance in force, assumed	382.3	425.0	482.5
Life insurance in force, net	0	0	0
Total premiums, gross	37.4	36.2	34.0
Total premiums, ceded	0.2	0.2	0.2
Total premiums, assumed	0.1	0	0.1
Total premiums, net	37.3	36.0	33.9
Accident and health insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums, gross	0.2	0.2	0.2
Total premiums, ceded	0.2	0.2	0.2
Total premiums, assumed	0	0	0
Total premiums, net	0	0	0
Annuities
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Total premiums, gross	37.2	36.0	33.8
Total premiums, ceded	0	0	0
Total premiums, assumed	0.1	0	0.1
Total premiums, net	$ 37.3	$ 36.0	$ 33.9