Consolidated Statements of Operations (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Net investment income	$ 1,348.8	$ 1,420.9	$ 1,342.3
Fee income	648.8	614.0	583.5
Premiums	36.0	33.9	67.3
Broker-dealer commission revenue	225.5	218.3	220.0
Net realized capital gains (losses):
Total other-than-temporary impairments	(14.1)	(116.8)	(199.2)
Less: Portion of other-than-temporary impairment losses recognized in Other comprehensive income (loss)	(3.2)	(9.5)	(52.1)
Net other-than-temporary impairments recognized in earnings	(10.9)	(107.3)	(147.1)
Other net realized capital gains (losses)	70.2	(108.5)	128.3
Total net realized capital gains (losses)	59.3	(215.8)	(18.8)
Other revenue	0	14.5	33.3
Total revenues	2,318.4	2,085.8	2,227.6
Benefits and expenses:
Interest credited and other benefits to contract owners	746.7	763.4	769.2
Operating expenses	696.5	692.0	789.8
Broker-dealer commission expense	225.5	218.3	220.0
Net amortization of deferred policy acquisition costs and value of business acquired	131.1	94.2	(41.2)
Interest expense	2.0	2.6	2.9
Total benefits and expenses	1,801.8	1,770.5	1,740.7
Income (loss) before income taxes	516.6	315.3	486.9
Income tax expense (benefit)	191.2	(5.0)	109.0
Net income (loss)	$ 325.4	$ 320.3	$ 377.9