Consolidated Statements of Changes in Shareholder's Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings (Deficit)
Beginning Balance at Dec. 31, 2009 (Before change in method)	$ 2,904.1	$ 2.8	$ 4,528.2	$ (15.0)	$ (1,611.9)
Beginning Balance (Cumulative effect of changes in accounting) (Actuarial gains (losses) for pension and post-retirement benefit plans)	0			17.4	(17.4)
Beginning Balance (Cumulative effect of changes in accounting) (Deferred policy acquisition costs)	(362.0)			13.9	(375.9)
Beginning Balance at Dec. 31, 2009	2,542.1	2.8	4,528.2	16.3	(2,005.2)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	377.9				377.9
Comprehensive income:
Other comprehensive income (loss), after tax	374.2			374.2
Total comprehensive income (loss)	752.1
Contributions from (distributions to) parent	(203.0)		(203.0)
Employee related benefits	0.8		0.8
Ending Balance at Dec. 31, 2010	3,092.0	2.8	4,326.0	390.5	(1,627.3)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	320.3				320.3
Comprehensive income:
Other comprehensive income (loss), after tax	357.0			357.0
Total comprehensive income (loss)	677.3
Contributions from (distributions to) parent	201.0		201.0
Employee related benefits	6.0		6.0
Ending Balance at Dec. 31, 2011	3,976.3	2.8	4,533.0	747.5	(1,307.0)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	325.4				325.4
Comprehensive income:
Other comprehensive income (loss), after tax	275.5			275.5
Total comprehensive income (loss)	600.9
Contributions from (distributions to) parent	(340.0)		(340.0)
Employee related benefits	24.2		24.2
Ending Balance at Dec. 31, 2012	$ 4,261.4	$ 2.8	$ 4,217.2	$ 1,023.0	$ (981.6)