Supplemental Unaudited Quarterly Financial Information Consolidated Statements of Income and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013		Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUES:
Premiums	$ 2.6	$ 3.1	$ 5.1	$ 3.1						$ 8.2	$ 11.3	$ 13.9	$ 8.5	$ 2.3
Insurance and investment product fees	96.3	94.0	87.2	90.1						177.3	271.3	367.6	365.3	394.3
Net investment income	37.4	36.3	34.1	33.0						67.1	103.4	140.8	130.9	101.1
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) losses	(0.6)	(0.2)	0	(0.3)						(0.3)	(0.5)	(1.1)	(5.0)	(10.1)
Portion of OTTI losses recognized in other comprehensive income (“OCI”)	0	0	(0.2)	(0.7)						(0.9)	(0.9)	(0.9)	2.2	6.9
Net OTTI losses recognized in earnings	(0.6)	(0.2)	(0.2)	(1.0)						(1.2)	(1.4)	(2.0)	(2.8)	(3.2)
Net realized investment gains (losses), excluding OTTI losses	13.5	(2.6)	10.9	(16.4)						(5.5)	(8.1)	5.4	(19.5)	(16.2)
Net realized investment gains (losses)	12.9	(2.8)	10.7	(17.4)						(6.7)	(9.5)	3.4	(22.3)	(19.4)
Total revenues	149.2	130.6	137.1	108.8	[1]	114.9	130.2	111.7	125.6	245.9	376.5	525.7	482.4	478.3
BENEFITS AND EXPENSES:
Policy benefits	14.8	91.8	91.4	88.5						179.9	271.7	286.5	396.8	302.6
Policy acquisition cost amortization	25.6	22.2	26.6	14.0						40.6	62.8	88.4	103.5	109.5
Other operating expenses	27.6	29.2	31.4	28.6						60.0	89.2	116.8	103.6	92.5
Total benefits and expenses	68.0	143.2	149.4	131.1	[1]	124.8	206.5	143.3	129.3	280.5	423.7	491.7	603.9	504.6
Income (loss) before income taxes	81.2	(12.6)	(12.3)	(22.3)						(34.6)	(47.2)	34.0	(121.5)	(26.3)
Income tax expense (benefit)	(5.5)	2.6	(16.9)	(1.9)	[1]	(7.4)	4.3	0.5	18.8	(18.8)	(16.2)	(21.7)	16.2	(6.3)
Net income (loss)	86.7	(15.2)	4.6	(20.4)	[1]	(2.5)	(80.6)	(32.1)	(22.5)	(15.8)	(31.0)	55.7	(137.7)	(20.0)
COMPREHENSIVE INCOME (LOSS):
Unrealized investment gains (losses), net of related offsets	(19.6)	9.9	(12.1)	(13.3)						(25.4)	(15.5)	(35.1)	33.7	19.7
Unrealized investment gains (losses), net of related offsets	(2.1)	(0.3)	(12.1)	2.7						(9.4)	(9.7)	(11.8)	24.9	4.2
Other comprehensive income (loss), net of income taxes	(17.5)	10.2	0	(16.0)						(16.0)	(5.8)	(23.3)	8.8	15.5
Comprehensive income (loss)	$ 69.2	$ (5.0)	$ 4.6	$ (36.4)						$ (31.8)	$ (36.8)	$ 32.4	$ (128.9)	$ (4.5)

[1] Results for the quarter ended March 31, 2013 include $3.2 million of income (loss) related to out of period adjustments. Such amounts are not material to any period presented.