Condensed Statements of Changes in Shareholder's Equity (USD $) In Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)	Comprehensive Income
Balance at Dec. 31, 2009	$ 2,740.1	$ 2.5	$ 5,172.7	$ (532.5)	$ (1,902.6)
Comprehensive income:
Net income (loss)	(45.2)				(45.2)	(45.2)
Other comprehensive income (loss), net of tax:
Change in net unrealized capital gains (losses) on securities ($77.3 pretax) and ($387.1 pretax) for six months ended June 30, 2011 and June 30, 2010, respectively	383.1			383.1		383.1
Change in other-than-temporary impairment losses recognized in other comprehensive income (loss) ($31.8 pretax) and ($33.6 pretax) for six months ended June 30, 2011 and June 30, 2010, respectively	21.8			21.8		21.8
Pension liability ($0.2 pretax)	(0.1)			(0.1)		(0.1)
Total comprehensive income	359.6					359.6
Contribution of capital	239.0		239.0
Employee share-based payments	0.8		0.8
Balance at Jun. 30, 2010	3,339.5	2.5	5,412.5	(127.7)	(1,947.8)
Balance at Dec. 31, 2010	4,235.2	2.5	5,921.7	132.3	(1,821.3)
Comprehensive income:
Net income (loss)	138.4				138.4	138.4
Other comprehensive income (loss), net of tax:
Change in net unrealized capital gains (losses) on securities ($77.3 pretax) and ($387.1 pretax) for six months ended June 30, 2011 and June 30, 2010, respectively	55.2			55.2		55.2
Change in other-than-temporary impairment losses recognized in other comprehensive income (loss) ($31.8 pretax) and ($33.6 pretax) for six months ended June 30, 2011 and June 30, 2010, respectively	20.7			20.7		20.7
Pension liability ($0.2 pretax)	(0.1)			(0.1)		(0.1)
Total comprehensive income	214.2					214.2
Contribution of capital	44.0		44.0
Employee share-based payments	0.7		0.7
Balance at Jun. 30, 2011	$ 4,494.1	$ 2.5	$ 5,966.4	$ 208.1	$ (1,682.9)